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Thu, 05 Sep 2024 16:24:53 -0400 X-MC-Unique: 0WOjJB4MP1uA-KwSxe6nqg-1 Received: from mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.12]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 700781955D4A for ; Thu, 5 Sep 2024 20:24:51 +0000 (UTC) Received: from oldenburg.str.redhat.com (unknown [10.2.16.26]) by mx-prod-int-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 1A3C719560B3 for ; Thu, 5 Sep 2024 20:24:35 +0000 (UTC) From: Florian Weimer To: libc-alpha@sourceware.org Subject: [PATCH v2 2/3] Linux: Add the sched_setattr and sched_getattr functions In-Reply-To: Message-ID: <1f7f9c80017e91f0af99e1bfd9ec1f59c6cc0da7.1725567796.git.fweimer@redhat.com> References: X-From-Line: 1f7f9c80017e91f0af99e1bfd9ec1f59c6cc0da7 Mon Sep 17 00:00:00 2001 Date: Thu, 05 Sep 2024 22:24:33 +0200 User-Agent: Gnus/5.13 (Gnus v5.13) MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com X-Spam-Status: No, score=-9.3 required=5.0 tests=BAYES_00, DKIMWL_WL_HIGH, DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, DKIM_VALID_EF, GIT_PATCH_0, KAM_SHORT, RCVD_IN_DNSWL_NONE, RCVD_IN_MSPIKE_H3, RCVD_IN_MSPIKE_WL, RCVD_IN_SBL_CSS, SPF_HELO_NONE, SPF_NONE, TXREP, T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org X-BeenThere: libc-alpha@sourceware.org X-Mailman-Version: 2.1.30 Precedence: list List-Id: Libc-alpha mailing list List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: libc-alpha-bounces~incoming=patchwork.ozlabs.org@sourceware.org And struct sched_attr. In sysdeps/unix/sysv/linux/bits/sched.h, the hack that defines sched_param around the inclusion of is quite ugly, but the definition of struct sched_param has already been dropped by the kernel, so there is nothing else we can do and maintain compatibility of with a wide range of kernel header versions. (An alternative would involve introducing a separate header for this functionality, but this seems unnecessary.) The existing sched_* functions that change scheduler parameters are already incompatible with PTHREAD_PRIO_PROTECT mutexes, so there is no harm in adding more functionality in this area. The documentation mostly defers to the Linux manual pages. Reviewed-by: Carlos O'Donell --- NEWS | 3 + manual/resource.texi | 115 ++++++++++++++++++ sysdeps/unix/sysv/linux/Makefile | 3 + sysdeps/unix/sysv/linux/Versions | 4 + sysdeps/unix/sysv/linux/aarch64/libc.abilist | 2 + sysdeps/unix/sysv/linux/alpha/libc.abilist | 2 + sysdeps/unix/sysv/linux/arc/libc.abilist | 2 + sysdeps/unix/sysv/linux/arm/be/libc.abilist | 2 + sysdeps/unix/sysv/linux/arm/le/libc.abilist | 2 + sysdeps/unix/sysv/linux/bits/sched.h | 44 ++++++- sysdeps/unix/sysv/linux/csky/libc.abilist | 2 + sysdeps/unix/sysv/linux/hppa/libc.abilist | 2 + sysdeps/unix/sysv/linux/i386/libc.abilist | 2 + .../sysv/linux/loongarch/lp64/libc.abilist | 2 + .../sysv/linux/m68k/coldfire/libc.abilist | 2 + .../unix/sysv/linux/m68k/m680x0/libc.abilist | 2 + .../sysv/linux/microblaze/be/libc.abilist | 2 + .../sysv/linux/microblaze/le/libc.abilist | 2 + .../sysv/linux/mips/mips32/fpu/libc.abilist | 2 + .../sysv/linux/mips/mips32/nofpu/libc.abilist | 2 + .../sysv/linux/mips/mips64/n32/libc.abilist | 2 + .../sysv/linux/mips/mips64/n64/libc.abilist | 2 + sysdeps/unix/sysv/linux/nios2/libc.abilist | 2 + sysdeps/unix/sysv/linux/or1k/libc.abilist | 2 + .../linux/powerpc/powerpc32/fpu/libc.abilist | 2 + .../powerpc/powerpc32/nofpu/libc.abilist | 2 + .../linux/powerpc/powerpc64/be/libc.abilist | 2 + .../linux/powerpc/powerpc64/le/libc.abilist | 2 + .../unix/sysv/linux/riscv/rv32/libc.abilist | 2 + .../unix/sysv/linux/riscv/rv64/libc.abilist | 2 + .../unix/sysv/linux/s390/s390-32/libc.abilist | 2 + .../unix/sysv/linux/s390/s390-64/libc.abilist | 2 + sysdeps/unix/sysv/linux/sched_getattr.c | 27 ++++ sysdeps/unix/sysv/linux/sched_setattr.c | 26 ++++ sysdeps/unix/sysv/linux/sh/be/libc.abilist | 2 + sysdeps/unix/sysv/linux/sh/le/libc.abilist | 2 + .../sysv/linux/sparc/sparc32/libc.abilist | 2 + .../sysv/linux/sparc/sparc64/libc.abilist | 2 + sysdeps/unix/sysv/linux/tst-sched_setattr.c | 105 ++++++++++++++++ .../unix/sysv/linux/x86_64/64/libc.abilist | 2 + .../unix/sysv/linux/x86_64/x32/libc.abilist | 2 + 41 files changed, 391 insertions(+), 2 deletions(-) create mode 100644 sysdeps/unix/sysv/linux/sched_getattr.c create mode 100644 sysdeps/unix/sysv/linux/sched_setattr.c create mode 100644 sysdeps/unix/sysv/linux/tst-sched_setattr.c diff --git a/NEWS b/NEWS index d488874aba..10894e7b5a 100644 --- a/NEWS +++ b/NEWS @@ -25,6 +25,9 @@ Major new features: which is why this mode is not enabled by default. A future version of the library may turn it on by default, however. +* On Linux, the sched_setattr and sched_getattr have been added, for + supporting parameterized scheduling policies such as SCHED_DEADLINE. + Deprecated and removed features, and other changes affecting compatibility: [Add deprecations, removals and changes affecting compatibility here] diff --git a/manual/resource.texi b/manual/resource.texi index 25966bcb64..612520d4d9 100644 --- a/manual/resource.texi +++ b/manual/resource.texi @@ -478,6 +478,7 @@ POSIX syntax had in mind. * Absolute Priority:: The first tier of priority. Posix * Realtime Scheduling:: Scheduling among the process nobility * Basic Scheduling Functions:: Get/set scheduling policy, priority +* Extensible Scheduling:: Parameterized scheduling policies. * Traditional Scheduling:: Scheduling among the vulgar masses * CPU Affinity:: Limiting execution to certain CPUs @end menu @@ -952,6 +953,120 @@ function, so there are no specific @code{errno} values. @end deftypefun +@node Extensible Scheduling +@subsection Extensible Scheduling +@cindex scheduling, extensible + +The type @code{struct sched_attr} and the functions @code{sched_setattr} +and @code{sched_getattr} are used to implement scheduling policies with +multiple parameters (not just priority and niceness). + +It is expected that these interfaces will be compatible with all future +scheduling policies. + +For additional information about scheduling policies, consult consult +the manual pages @manpageurl{sched,7} and @manpageurl{sched_setattr,2}. +@xref{Linux Kernel}. + +@strong{Note:} Calling the @code{sched_setattr} function is incompatible +with support for @code{PTHREAD_PRIO_PROTECT} mutexes. + +@deftp {Data Type} {struct sched_attr} +@standards{Linux, sched.h} +The @code{sched_attr} structure describes a parameterized scheduling policy. + +@strong{Portability note:} In the future, additional fields can be added +to @code{struct sched_attr} at the end, so that the size of this data +type changes. Do not use it in places where this matters, such as +structure fields in installed header files, where such a change could +impact the application binary interface (ABI). + +The following generic fields are available. + +@table @code +@item size +The actually used size of the data structure. See the description of +the functions @code{sched_setattr} and @code{sched_getattr} below how this +field is used to support extension of @code{struct sched_attr} with +more fields. + +@item sched_policy +The scheduling policy. This field determines which fields in the +structure are used, and how the @code{sched_flags} field is interpreted. + +@item sched_flags +Scheduling flags associated with the scheduling policy. +@end table + +In addition to the generic fields, policy-specific fields are available. +For additional information, consult the manual page +@manpageurl{sched_setattr,2}. @xref{Linux Kernel}. +@end deftp + +@deftypefun int sched_setaddr (pid_t @var{tid}, struct sched_attr *@var{attr}, unsigned int flags) +@standards{Linux, sched.h} +@safety{@mtsafe{}@assafe{}@acsafe{}} +This functions applies the scheduling policy described by +@code{*@var{attr}} to the thread @var{tid} (the value zero denotes the +current thread). + +It is recommended to initialize unused fields to zero, either using +@code{memset}, or using a structure initializer. The +@code{@var{attr->size}} field should be set to @code{sizeof (struct +sched_attr)}, to inform the kernel of the structure version in use. + +The @var{flags} argument must be zero. Other values may become +available in the future. + +On failure, @code{sched_setattr} returns @math{-1} and sets +@code{errno}. The following errors are related the way +extensibility is handled. +@table @code +@item E2BIG +A field in @code{*@var{attr}} has a non-zero value, but is unknown to +the kernel. The application could try to apply a modified policy, where +more fields are zero. + +@item EINVAL +The policy in @code{@var{attr}->sched_policy} is unknown to the kernel, +or flags are set in @code{@var{attr}->sched_flags} that the kernel does +not know how to interpret. The application could try with fewer flags +set, or a different scheduling policy. + +This error also occurs if @var{attr} is @code{NULL} or @var{flags} is +not zero. + +@item EPERM +The current thread is not sufficiently privileged to assign the policy, +either because access to the policy is restricted in general, or because +the current thread does not have the rights to change the scheduling +policy of the thread @var{tid}. +@end table + +Other error codes depend on the scheduling policy. +@end deftypefun + +@deftypefun int sched_getaddr (pid_t @var{tid}, struct sched_attr *@var{attr}, unsigned int size, unsigned int flags) +@standards{Linux, sched.h} +@safety{@mtsafe{}@assafe{}@acsafe{}} +This function obtains the scheduling policy of the thread @var{tid} +(zero denotes the current thread) and store it in @code{*@var{attr}}, +which must have space for at least @var{size} bytes. + +The @var{flags} argument must be zero. Other values may become +available in the future. + +Upon success, @code{@var{attr}->size} contains the size of the structure +version used by the kernel. Fields with offsets greater or equal to +@code{@var{attr}->size} are not updated by the kernel. To obtain +predictable values for unknown fields, use @code{memset} to set +all @var{size} bytes to zero prior to calling @code{sched_getattr}. + +On failure, @code{sched_getattr} returns @math{-1} and sets @code{errno}. +If @code{errno} is @code{E2BIG}, this means that the buffer is not large +large enough, and the application could retry with a larger buffer. +@end deftypefun + @node Traditional Scheduling @subsection Traditional Scheduling @cindex scheduling, traditional diff --git a/sysdeps/unix/sysv/linux/Makefile b/sysdeps/unix/sysv/linux/Makefile index 59998c7af4..0b45d4e42b 100644 --- a/sysdeps/unix/sysv/linux/Makefile +++ b/sysdeps/unix/sysv/linux/Makefile @@ -95,6 +95,8 @@ sysdep_routines += \ process_vm_writev \ pselect32 \ readahead \ + sched_getattr \ + sched_setattr \ setfsgid \ setfsuid \ setvmaname \ @@ -224,6 +226,7 @@ tests += \ tst-process_mrelease \ tst-quota \ tst-rlimit-infinity \ + tst-sched_setattr \ tst-scm_rights \ tst-sigtimedwait \ tst-sync_file_range \ diff --git a/sysdeps/unix/sysv/linux/Versions b/sysdeps/unix/sysv/linux/Versions index 268ba1b6ac..213ff5f1fe 100644 --- a/sysdeps/unix/sysv/linux/Versions +++ b/sysdeps/unix/sysv/linux/Versions @@ -328,6 +328,10 @@ libc { posix_spawnattr_getcgroup_np; posix_spawnattr_setcgroup_np; } + GLIBC_2.41 { + sched_getattr; + sched_setattr; + } GLIBC_PRIVATE { # functions used in other libraries __syscall_rt_sigqueueinfo; diff --git a/sysdeps/unix/sysv/linux/aarch64/libc.abilist b/sysdeps/unix/sysv/linux/aarch64/libc.abilist index 68eeca1c08..38db77e4f7 100644 --- a/sysdeps/unix/sysv/linux/aarch64/libc.abilist +++ b/sysdeps/unix/sysv/linux/aarch64/libc.abilist @@ -2748,3 +2748,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/alpha/libc.abilist b/sysdeps/unix/sysv/linux/alpha/libc.abilist index 34c187b721..637bfce9fb 100644 --- a/sysdeps/unix/sysv/linux/alpha/libc.abilist +++ b/sysdeps/unix/sysv/linux/alpha/libc.abilist @@ -3095,6 +3095,8 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/arc/libc.abilist b/sysdeps/unix/sysv/linux/arc/libc.abilist index 916c18ea94..4a305cf730 100644 --- a/sysdeps/unix/sysv/linux/arc/libc.abilist +++ b/sysdeps/unix/sysv/linux/arc/libc.abilist @@ -2509,3 +2509,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/arm/be/libc.abilist b/sysdeps/unix/sysv/linux/arm/be/libc.abilist index ea95de282a..1d54f71b14 100644 --- a/sysdeps/unix/sysv/linux/arm/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/be/libc.abilist @@ -2801,6 +2801,8 @@ GLIBC_2.4 xdrstdio_create F GLIBC_2.4 xencrypt F GLIBC_2.4 xprt_register F GLIBC_2.4 xprt_unregister F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/arm/le/libc.abilist b/sysdeps/unix/sysv/linux/arm/le/libc.abilist index 1cdbc983e1..ff7e8bc40b 100644 --- a/sysdeps/unix/sysv/linux/arm/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/arm/le/libc.abilist @@ -2798,6 +2798,8 @@ GLIBC_2.4 xdrstdio_create F GLIBC_2.4 xencrypt F GLIBC_2.4 xprt_register F GLIBC_2.4 xprt_unregister F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/bits/sched.h b/sysdeps/unix/sysv/linux/bits/sched.h index a53e1362a0..e5b7efb887 100644 --- a/sysdeps/unix/sysv/linux/bits/sched.h +++ b/sysdeps/unix/sysv/linux/bits/sched.h @@ -34,10 +34,39 @@ # define SCHED_IDLE 5 # define SCHED_DEADLINE 6 +/* Flags that can be used in policy values. */ # define SCHED_RESET_ON_FORK 0x40000000 -#endif -#ifdef __USE_GNU +/* Use "" to work around incorrect macro expansion of the + __has_include argument (GCC PR 80005). */ +# ifdef __has_include +# if __has_include ("linux/sched/types.h") +/* Some older Linux versions defined sched_param in . */ +# define sched_param __glibc_mask_sched_param +# include +# undef sched_param +# endif +# endif +# ifndef SCHED_ATTR_SIZE_VER0 +# include +# define SCHED_ATTR_SIZE_VER0 48 +# define SCHED_ATTR_SIZE_VER1 56 +struct sched_attr +{ + __u32 size; + __u32 sched_policy; + __u64 sched_flags; + __s32 sched_nice; + __u32 sched_priority; + __u64 sched_runtime; + __u64 sched_deadline; + __u64 sched_period; + __u32 sched_util_min; + __u32 sched_util_max; + /* Additional fields may be added at the end. */ +}; +# endif /* !SCHED_ATTR_SIZE_VER0 */ + /* Cloning flags. */ # define CSIGNAL 0x000000ff /* Signal mask to be sent at exit. */ # define CLONE_VM 0x00000100 /* Set if VM shared between processes. */ @@ -97,6 +126,17 @@ extern int getcpu (unsigned int *, unsigned int *) __THROW; /* Switch process to namespace of type NSTYPE indicated by FD. */ extern int setns (int __fd, int __nstype) __THROW; + +/* Apply the scheduling attributes from *ATTR to the process or thread TID. */ +int sched_setattr (pid_t tid, struct sched_attr *attr, unsigned int flags) + __THROW __nonnull ((2)); + +/* Obtain the scheduling attributes of the process or thread TID and + store it in *ATTR. */ +int sched_getattr (pid_t tid, struct sched_attr *attr, unsigned int size, + unsigned int flags) + __THROW __nonnull ((2)) __attr_access ((__write_only__, 2, 3)); + #endif __END_DECLS diff --git a/sysdeps/unix/sysv/linux/csky/libc.abilist b/sysdeps/unix/sysv/linux/csky/libc.abilist index 96d45961e2..c3ed65467d 100644 --- a/sysdeps/unix/sysv/linux/csky/libc.abilist +++ b/sysdeps/unix/sysv/linux/csky/libc.abilist @@ -2785,3 +2785,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/hppa/libc.abilist b/sysdeps/unix/sysv/linux/hppa/libc.abilist index fbcd60c2b3..8de7644a59 100644 --- a/sysdeps/unix/sysv/linux/hppa/libc.abilist +++ b/sysdeps/unix/sysv/linux/hppa/libc.abilist @@ -2821,6 +2821,8 @@ GLIBC_2.4 sys_errlist D 0x400 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/i386/libc.abilist b/sysdeps/unix/sysv/linux/i386/libc.abilist index c989b433c0..4fedf775d4 100644 --- a/sysdeps/unix/sysv/linux/i386/libc.abilist +++ b/sysdeps/unix/sysv/linux/i386/libc.abilist @@ -3005,6 +3005,8 @@ GLIBC_2.4 sys_errlist D 0x210 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist b/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist index 0023ec1fa1..0024282289 100644 --- a/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist +++ b/sysdeps/unix/sysv/linux/loongarch/lp64/libc.abilist @@ -2269,3 +2269,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist index d9bd6a9b56..142595eb3e 100644 --- a/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/coldfire/libc.abilist @@ -2781,6 +2781,8 @@ GLIBC_2.4 xdrstdio_create F GLIBC_2.4 xencrypt F GLIBC_2.4 xprt_register F GLIBC_2.4 xprt_unregister F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist index 439796d693..85e7746c10 100644 --- a/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist +++ b/sysdeps/unix/sysv/linux/m68k/m680x0/libc.abilist @@ -2948,6 +2948,8 @@ GLIBC_2.4 sys_errlist D 0x210 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist index 1069d3252c..91dc1b8378 100644 --- a/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/be/libc.abilist @@ -2834,3 +2834,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist index 17abe08c8b..3440e90f6f 100644 --- a/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/microblaze/le/libc.abilist @@ -2831,3 +2831,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist index 799e508950..5ee7b8c52f 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/fpu/libc.abilist @@ -2909,6 +2909,8 @@ GLIBC_2.4 renameat F GLIBC_2.4 symlinkat F GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist index 1c10996cbc..6cb6328e7c 100644 --- a/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips32/nofpu/libc.abilist @@ -2907,6 +2907,8 @@ GLIBC_2.4 renameat F GLIBC_2.4 symlinkat F GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist index 03d9655f26..ae7474c0f0 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n32/libc.abilist @@ -2915,6 +2915,8 @@ GLIBC_2.4 renameat F GLIBC_2.4 symlinkat F GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist index 05e402ed30..cdf040dec2 100644 --- a/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist +++ b/sysdeps/unix/sysv/linux/mips/mips64/n64/libc.abilist @@ -2817,6 +2817,8 @@ GLIBC_2.4 renameat F GLIBC_2.4 symlinkat F GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/nios2/libc.abilist b/sysdeps/unix/sysv/linux/nios2/libc.abilist index 3aa81766aa..773d4c5873 100644 --- a/sysdeps/unix/sysv/linux/nios2/libc.abilist +++ b/sysdeps/unix/sysv/linux/nios2/libc.abilist @@ -2873,3 +2873,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/or1k/libc.abilist b/sysdeps/unix/sysv/linux/or1k/libc.abilist index 959e59e7e7..c356a11b1c 100644 --- a/sysdeps/unix/sysv/linux/or1k/libc.abilist +++ b/sysdeps/unix/sysv/linux/or1k/libc.abilist @@ -2259,3 +2259,5 @@ GLIBC_2.40 getcontext F GLIBC_2.40 makecontext F GLIBC_2.40 setcontext F GLIBC_2.40 swapcontext F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist index 9714305608..7937f94cf0 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/fpu/libc.abilist @@ -3138,6 +3138,8 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist index 0beb52c542..d6e35f31d2 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc32/nofpu/libc.abilist @@ -3183,6 +3183,8 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist index cfc2ebd3ec..2268d6890d 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/be/libc.abilist @@ -2892,6 +2892,8 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist index 8c9efc5a16..7f61b14bc8 100644 --- a/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/powerpc/powerpc64/le/libc.abilist @@ -2968,3 +2968,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist index 6397a9cb91..4187241f50 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv32/libc.abilist @@ -2512,3 +2512,5 @@ GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F GLIBC_2.40 __riscv_hwprobe F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist index 71bbf94f66..8935beccac 100644 --- a/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist +++ b/sysdeps/unix/sysv/linux/riscv/rv64/libc.abilist @@ -2712,3 +2712,5 @@ GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F GLIBC_2.40 __riscv_hwprobe F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F diff --git a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist index a7467e2850..e69dc7ccf6 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-32/libc.abilist @@ -3136,6 +3136,8 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist index fd1cb2972d..7d860001d8 100644 --- a/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist +++ b/sysdeps/unix/sysv/linux/s390/s390-64/libc.abilist @@ -2929,6 +2929,8 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/sched_getattr.c b/sysdeps/unix/sysv/linux/sched_getattr.c new file mode 100644 index 0000000000..e6b9970fcb --- /dev/null +++ b/sysdeps/unix/sysv/linux/sched_getattr.c @@ -0,0 +1,27 @@ +/* Reading scheduling policy and attributes. + Copyright (C) 2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include + +int +sched_getattr (pid_t pid, struct sched_attr *attr, unsigned int size, + unsigned int flags) +{ + return INLINE_SYSCALL_CALL (sched_getattr, pid, attr, size, flags); +} diff --git a/sysdeps/unix/sysv/linux/sched_setattr.c b/sysdeps/unix/sysv/linux/sched_setattr.c new file mode 100644 index 0000000000..25403fb454 --- /dev/null +++ b/sysdeps/unix/sysv/linux/sched_setattr.c @@ -0,0 +1,26 @@ +/* Setting scheduling policy and attributes. + Copyright (C) 2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include +#include + +int +sched_setattr (pid_t pid, struct sched_attr *attr, unsigned int flags) +{ + return INLINE_SYSCALL_CALL (sched_setattr, pid, attr, flags); +} diff --git a/sysdeps/unix/sysv/linux/sh/be/libc.abilist b/sysdeps/unix/sysv/linux/sh/be/libc.abilist index ff6e6b1a13..fcb8161841 100644 --- a/sysdeps/unix/sysv/linux/sh/be/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/be/libc.abilist @@ -2828,6 +2828,8 @@ GLIBC_2.4 sys_errlist D 0x210 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/sh/le/libc.abilist b/sysdeps/unix/sysv/linux/sh/le/libc.abilist index 449d92bbc5..3fd078d125 100644 --- a/sysdeps/unix/sysv/linux/sh/le/libc.abilist +++ b/sysdeps/unix/sysv/linux/sh/le/libc.abilist @@ -2825,6 +2825,8 @@ GLIBC_2.4 sys_errlist D 0x210 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist index e615be759a..1ce1fe9da7 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc32/libc.abilist @@ -3157,6 +3157,8 @@ GLIBC_2.4 wcstold F GLIBC_2.4 wcstold_l F GLIBC_2.4 wprintf F GLIBC_2.4 wscanf F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist index bd36431dd7..07507b86f6 100644 --- a/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist +++ b/sysdeps/unix/sysv/linux/sparc/sparc64/libc.abilist @@ -2793,6 +2793,8 @@ GLIBC_2.4 sys_errlist D 0x430 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/tst-sched_setattr.c b/sysdeps/unix/sysv/linux/tst-sched_setattr.c new file mode 100644 index 0000000000..a6288a1a7c --- /dev/null +++ b/sysdeps/unix/sysv/linux/tst-sched_setattr.c @@ -0,0 +1,105 @@ +/* Tests for sched_setattr and sched_getattr. + Copyright (C) 2024 Free Software Foundation, Inc. + This file is part of the GNU C Library. + + The GNU C Library is free software; you can redistribute it and/or + modify it under the terms of the GNU Lesser General Public License as + published by the Free Software Foundation; either version 2.1 of the + License, or (at your option) any later version. + + The GNU C Library is distributed in the hope that it will be useful, + but WITHOUT ANY WARRANTY; without even the implied warranty of + MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU + Lesser General Public License for more details. + + You should have received a copy of the GNU Lesser General Public + License along with the GNU C Library; if not, see + . */ + +#include + +#include +#include +#include +#include +#include +#include + +/* Padding struct to detect unexpected writes. */ +union +{ + struct sched_attr attr; + /* Hopefully the kernel will never need as much. */ + unsigned char padding[4096]; +} u; + +static void +check_unused (void) +{ + TEST_VERIFY (u.attr.size < sizeof (u)); + for (unsigned int i = u.attr.size; i < sizeof (u); ++i) + TEST_COMPARE (u.padding[i], 0xcc); +} + +static int +do_test (void) +{ + TEST_VERIFY (sizeof (struct sched_attr) < sizeof (u)); + + /* Check that reading and re-applying the current policy works. */ + memset (&u, 0xcc, sizeof (u)); + /* Compiler barrier to bypass write access attribute. */ + volatile unsigned int size = sizeof (u); + TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0); + check_unused (); + TEST_COMPARE (sched_setattr (0, &u.attr, 0), 0); /* Apply unchanged. */ + + /* Try to switch to the SCHED_OTHER policy. */ + memset (&u, 0, sizeof (u)); + u.attr.size = sizeof (u); /* With padding, kernel should accept zeroes. */ + u.attr.sched_policy = SCHED_OTHER; /* Should be the default. */ + { + errno = 0; + int prio = getpriority (PRIO_PROCESS, 0); + if (errno != 0) + prio = 0; + u.attr.sched_nice = prio; + } + TEST_COMPARE (sched_setattr (0, &u.attr, 0), 0); + + /* Non-zero values not known to the kernel result in an E2BIG error. */ + memset (&u, 0, sizeof (u)); + TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0); + u.padding[u.attr.size] = 0xcc; + u.attr.size = sizeof (u); + errno = 0; + TEST_COMPARE (sched_setattr (0, &u.attr, 0), -1); + TEST_COMPARE (errno, E2BIG); + + memset (&u, 0xcc, sizeof (u)); + TEST_COMPARE (sched_getattr (0, (struct sched_attr *) &u, size, 0), 0); + TEST_COMPARE (u.attr.sched_policy, SCHED_OTHER); + check_unused (); + + /* Raise the niceless level to 19 and observe its effect. */ + TEST_COMPARE (nice (19), 19); + TEST_COMPARE (sched_getattr (0, &u.attr, sizeof (u.attr), 0), 0); + TEST_COMPARE (u.attr.sched_policy, SCHED_OTHER); + TEST_COMPARE (u.attr.sched_nice, 19); + check_unused (); + + /* Invalid buffer arguments result in EINVAL (not EFAULT). */ + { + errno = 0; + void *volatile null_pointer = NULL; /* compiler barrier. */ + TEST_COMPARE (sched_setattr (0, null_pointer, 0), -1); + TEST_COMPARE (errno, EINVAL); + errno = 0; + TEST_COMPARE (sched_getattr (0, null_pointer, size, 0), -1); + TEST_COMPARE (errno, EINVAL); + } + + return 0; +} + +#include diff --git a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist index aea7848ed6..5acf49dbe8 100644 --- a/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/64/libc.abilist @@ -2744,6 +2744,8 @@ GLIBC_2.4 sys_errlist D 0x420 GLIBC_2.4 sys_nerr D 0x4 GLIBC_2.4 unlinkat F GLIBC_2.4 unshare F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F GLIBC_2.5 __readlinkat_chk F GLIBC_2.5 inet6_opt_append F GLIBC_2.5 inet6_opt_find F diff --git a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist index 4ab3681914..02d1bb97dc 100644 --- a/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist +++ b/sysdeps/unix/sysv/linux/x86_64/x32/libc.abilist @@ -2763,3 +2763,5 @@ GLIBC_2.39 stdc_trailing_zeros_ui F GLIBC_2.39 stdc_trailing_zeros_ul F GLIBC_2.39 stdc_trailing_zeros_ull F GLIBC_2.39 stdc_trailing_zeros_us F +GLIBC_2.41 sched_getattr F +GLIBC_2.41 sched_setattr F