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Wed, 19 Jun 2024 12:41:40 -0700 (PDT) Date: Wed, 19 Jun 2024 21:41:09 +0200 Mime-Version: 1.0 Message-ID: <20240619194109.248066-1-fdurso@google.com> Subject: [PATCH] linux-user: open_self_stat: Implement num_threads From: "Fabio D'Urso" To: qemu-devel@nongnu.org Cc: Laurent Vivier , "Fabio D'Urso" Received-SPF: pass client-ip=2a00:1450:4864:20::34a; envelope-from=3dDRzZgYKCuMKIZWXTLTTLQJ.HTRVJRZ-IJaJQSTSLSZ.TWL@flex--fdurso.bounces.google.com; helo=mail-wm1-x34a.google.com X-Spam_score_int: -95 X-Spam_score: -9.6 X-Spam_bar: --------- X-Spam_report: (-9.6 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_MED=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01, USER_IN_DEF_DKIM_WL=-7.5 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org The num_threads field reports the total number of threads in the process. In QEMU, this is equal to the number of CPU instances. Signed-off-by: Fabio D'Urso Reviewed-by: Alex Bennée --- linux-user/syscall.c | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/linux-user/syscall.c b/linux-user/syscall.c index b9b5a387b3..a47b2eeb65 100644 --- a/linux-user/syscall.c +++ b/linux-user/syscall.c @@ -8171,6 +8171,16 @@ static int open_self_stat(CPUArchState *cpu_env, int fd) } else if (i == 3) { /* ppid */ g_string_printf(buf, FMT_pid " ", getppid()); + } else if (i == 19) { + /* num_threads */ + int cpus = 0; + WITH_RCU_READ_LOCK_GUARD() { + CPUState *cpu_iter; + CPU_FOREACH(cpu_iter) { + cpus++; + } + } + g_string_printf(buf, "%d ", cpus); } else if (i == 21) { /* starttime */ g_string_printf(buf, "%" PRIu64 " ", ts->start_boottime);