[v3,00/14] migration/multifd: Remove multifd_send_state->pages

Message ID	20240801123516.4498-1-farosas@suse.de
Headers	show Return-Path: <qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org> From: Fabiano Rosas <farosas@suse.de> To: qemu-devel@nongnu.org Cc: Peter Xu <peterx@redhat.com>, "Maciej S . Szmigiero" <mail@maciej.szmigiero.name> Subject: [PATCH v3 00/14] migration/multifd: Remove multifd_send_state->pages Date: Thu, 1 Aug 2024 09:35:02 -0300 Message-Id: <20240801123516.4498-1-farosas@suse.de> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2a07:de40:b251:101:10:150:64:2; envelope-from=farosas@suse.de; helo=smtp-out2.suse.de X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action Precedence: list Errors-To: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org Sender: qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org
Series	migration/multifd: Remove multifd_send_state->pages \| expand [v3,00/14] migration/multifd: Remove multifd_send_state->pages [v3,01/14] migration/multifd: Reduce access to p->pages [v3,02/14] migration/multifd: Inline page_size and page_count [v3,03/14] migration/multifd: Remove pages->allocated [v3,04/14] migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov [v3,05/14] migration/multifd: Introduce MultiFDSendData [v3,06/14] migration/multifd: Make MultiFDPages_t:offset a flexible array member [v3,07/14] migration/multifd: Replace p->pages with an union pointer [v3,08/14] migration/multifd: Move pages accounting into multifd_send_zero_page_detect() [v3,09/14] migration/multifd: Isolate ram pages packet data [v3,10/14] migration/multifd: Don't send ram data during SYNC [v3,11/14] migration/multifd: Replace multifd_send_state->pages with client data [v3,12/14] migration/multifd: Allow multifd sync without flush [v3,13/14] migration/multifd: Register nocomp ops dynamically [v3,14/14] migration/multifd: Move ram code into multifd-ram.c

Message ID

20240801123516.4498-1-farosas@suse.de

Headers

From: Fabiano Rosas <farosas@suse.de>
To: qemu-devel@nongnu.org
Cc: Peter Xu <peterx@redhat.com>,
 "Maciej S . Szmigiero" <mail@maciej.szmigiero.name>
Subject: [PATCH v3 00/14] migration/multifd: Remove multifd_send_state->pages
Date: Thu,  1 Aug 2024 09:35:02 -0300
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Series

migration/multifd: Remove multifd_send_state->pages | expand

Message

Fabiano Rosas Aug. 1, 2024, 12:35 p.m. UTC

Hi,

This v3 incorporates the suggestions done by Peter in v2. Aside from
those, of note:

- fixed the allocation of MultiFDSendData. The previous version didn't
  account for compiler-inserted holes;

- kept the packet split patch;

- added some patches to remove p->page_count, p->page_size,
  pages->allocated. These are all constants and don't need to be
  per-channel;

- moved the code into multifd-ram.c.

  However, I left the p->packet allocation (depends on page_count) and
  p->normal + p->zero behind because I need to see how the device
  state patches will deal with the packet stuff before I can come up
  with a way to move those out of the MultiFD*Params. It might not be
  worth it adding another struct just for the ram code to store
  p->normal, p->zero.

With this I'm pretty much done with what I think needs to be changed
as a prereq for the device state work. I don't have anything else in
mind to add to this series.

CI run: https://gitlab.com/farosas/qemu/-/pipelines/1395572680

v2:
https://lore.kernel.org/r/20240722175914.24022-1-farosas@suse.de

v1:
https://lore.kernel.org/r/20240620212111.29319-1-farosas@suse.de

First of all, apologies for the roughness of the series. I'm off for
the next couple of weeks and wanted to put something together early
for your consideration.

This series is a refactoring (based on an earlier, off-list
attempt[0]), aimed to remove the usage of the MultiFDPages_t type in
the multifd core. If we're going to add support for more data types to
multifd, we first need to clean that up.

This time around this work was prompted by Maciej's series[1]. I see
you're having to add a bunch of is_device_state checks to work around
the rigidity of the code.

Aside from the VFIO work, there is also the intent (coming back from
Juan's ideas) to make multifd the default code path for migration,
which will have to include the vmstate migration and anything else we
put on the stream via QEMUFile.

I have long since been bothered by having 'pages' sprinkled all over
the code, so I might be coming at this with a bit of a narrow focus,
but I believe in order to support more types of payloads in multifd,
we need to first allow the scheduling at multifd_send_pages() to be
independent of MultiFDPages_t. So here it is. Let me know what you
think.

(as I said, I'll be off for a couple of weeks, so feel free to
incorporate any of this code if it's useful. Or to ignore it
completely).

CI run: https://gitlab.com/farosas/qemu/-/pipelines/1340992028

0- https://github.com/farosas/qemu/commits/multifd-packet-cleanups/
1- https://lore.kernel.org/r/cover.1718717584.git.maciej.szmigiero@oracle.com

Fabiano Rosas (14):
  migration/multifd: Reduce access to p->pages
  migration/multifd: Inline page_size and page_count
  migration/multifd: Remove pages->allocated
  migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov
  migration/multifd: Introduce MultiFDSendData
  migration/multifd: Make MultiFDPages_t:offset a flexible array member
  migration/multifd: Replace p->pages with an union pointer
  migration/multifd: Move pages accounting into
    multifd_send_zero_page_detect()
  migration/multifd: Isolate ram pages packet data
  migration/multifd: Don't send ram data during SYNC
  migration/multifd: Replace multifd_send_state->pages with client data
  migration/multifd: Allow multifd sync without flush
  migration/multifd: Register nocomp ops dynamically
  migration/multifd: Move ram code into multifd-ram.c

 migration/file.c              |   3 +-
 migration/file.h              |   2 +-
 migration/meson.build         |   1 +
 migration/multifd-qpl.c       |  20 +-
 migration/multifd-ram.c       | 400 +++++++++++++++++++++++++
 migration/multifd-uadk.c      |  45 +--
 migration/multifd-zero-page.c |  13 +-
 migration/multifd-zlib.c      |  16 +-
 migration/multifd-zstd.c      |  15 +-
 migration/multifd.c           | 535 ++++++----------------------------
 migration/multifd.h           |  66 +++--
 migration/ram.c               |  10 +-
 migration/trace-events        |   9 +-
 13 files changed, 613 insertions(+), 522 deletions(-)
 create mode 100644 migration/multifd-ram.c


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Comments

Fabiano Rosas Aug. 1, 2024, 12:45 p.m. UTC | #1

Fabiano Rosas <farosas@suse.de> writes:

> Hi,
>
> This v3 incorporates the suggestions done by Peter in v2. Aside from
> those, of note:
>
> - fixed the allocation of MultiFDSendData. The previous version didn't
>   account for compiler-inserted holes;
>
> - kept the packet split patch;
>
> - added some patches to remove p->page_count, p->page_size,
>   pages->allocated. These are all constants and don't need to be
>   per-channel;
>
> - moved the code into multifd-ram.c.
>
>   However, I left the p->packet allocation (depends on page_count) and
>   p->normal + p->zero behind because I need to see how the device
>   state patches will deal with the packet stuff before I can come up
>   with a way to move those out of the MultiFD*Params. It might not be
>   worth it adding another struct just for the ram code to store
>   p->normal, p->zero.
>
> With this I'm pretty much done with what I think needs to be changed
> as a prereq for the device state work. I don't have anything else in
> mind to add to this series.
>
> CI run: https://gitlab.com/farosas/qemu/-/pipelines/1395572680
>
> v2:
> https://lore.kernel.org/r/20240722175914.24022-1-farosas@suse.de
>
> v1:
> https://lore.kernel.org/r/20240620212111.29319-1-farosas@suse.de
>
> First of all, apologies for the roughness of the series. I'm off for
> the next couple of weeks and wanted to put something together early
> for your consideration.
>
> This series is a refactoring (based on an earlier, off-list
> attempt[0]), aimed to remove the usage of the MultiFDPages_t type in
> the multifd core. If we're going to add support for more data types to
> multifd, we first need to clean that up.
>
> This time around this work was prompted by Maciej's series[1]. I see
> you're having to add a bunch of is_device_state checks to work around
> the rigidity of the code.
>
> Aside from the VFIO work, there is also the intent (coming back from
> Juan's ideas) to make multifd the default code path for migration,
> which will have to include the vmstate migration and anything else we
> put on the stream via QEMUFile.
>
> I have long since been bothered by having 'pages' sprinkled all over
> the code, so I might be coming at this with a bit of a narrow focus,
> but I believe in order to support more types of payloads in multifd,
> we need to first allow the scheduling at multifd_send_pages() to be
> independent of MultiFDPages_t. So here it is. Let me know what you
> think.
>
> (as I said, I'll be off for a couple of weeks, so feel free to
> incorporate any of this code if it's useful. Or to ignore it
> completely).
>
> CI run: https://gitlab.com/farosas/qemu/-/pipelines/1340992028
>
> 0- https://github.com/farosas/qemu/commits/multifd-packet-cleanups/
> 1- https://lore.kernel.org/r/cover.1718717584.git.maciej.szmigiero@oracle.com
>
> Fabiano Rosas (14):
>   migration/multifd: Reduce access to p->pages
>   migration/multifd: Inline page_size and page_count
>   migration/multifd: Remove pages->allocated
>   migration/multifd: Pass in MultiFDPages_t to file_write_ramblock_iov
>   migration/multifd: Introduce MultiFDSendData
>   migration/multifd: Make MultiFDPages_t:offset a flexible array member
>   migration/multifd: Replace p->pages with an union pointer
>   migration/multifd: Move pages accounting into
>     multifd_send_zero_page_detect()
>   migration/multifd: Isolate ram pages packet data
>   migration/multifd: Don't send ram data during SYNC
>   migration/multifd: Replace multifd_send_state->pages with client data
>   migration/multifd: Allow multifd sync without flush
>   migration/multifd: Register nocomp ops dynamically
>   migration/multifd: Move ram code into multifd-ram.c
>
>  migration/file.c              |   3 +-
>  migration/file.h              |   2 +-
>  migration/meson.build         |   1 +
>  migration/multifd-qpl.c       |  20 +-
>  migration/multifd-ram.c       | 400 +++++++++++++++++++++++++
>  migration/multifd-uadk.c      |  45 +--
>  migration/multifd-zero-page.c |  13 +-
>  migration/multifd-zlib.c      |  16 +-
>  migration/multifd-zstd.c      |  15 +-
>  migration/multifd.c           | 535 ++++++----------------------------
>  migration/multifd.h           |  66 +++--
>  migration/ram.c               |  10 +-
>  migration/trace-events        |   9 +-
>  13 files changed, 613 insertions(+), 522 deletions(-)
>  create mode 100644 migration/multifd-ram.c
>
>
> base-commit: 3cce8bd4d737f2ca688bbdcb92cd5cc683245bbd
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> prerequisite-patch-id: 17f3dadad0df0802e251ef45fabbced1b0604a03

I messed-up a little here. The base-commit should actually be:
base-commit: e9d2db818ff934afb366aea566d0b33acf7bced1