linux-kernel - [GIT PULL 07/12 for v6.18] workqueue

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Message-ID: <20250926-vfs-workqueue-6bff38a4de55@brauner>
Date: Fri, 26 Sep 2025 16:19:01 +0200
From: Christian Brauner <brauner@...nel.org>
To: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Christian Brauner <brauner@...nel.org>,
	linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org
Subject: [GIT PULL 07/12 for v6.18] workqueue

Hey Linus,

/* Summary */
This contains various workqueue changes affecting the filesystem layer.

Currently if a user enqueue a work item using schedule_delayed_work()
the used wq is "system_wq" (per-cpu wq) while queue_delayed_work() use
WORK_CPU_UNBOUND (used when a cpu is not specified). The same applies to
schedule_work() that is using system_wq and queue_work(), that makes use
again of WORK_CPU_UNBOUND.

This replaces the use of system_wq and system_unbound_wq. system_wq is a
per-CPU workqueue which isn't very obvious from the name and
system_unbound_wq is to be used when locality is not required.

So this renames system_wq to system_percpu_wq, and system_unbound_wq to
system_dfl_wq.

This also adds a new WQ_PERCPU flag to allow the fs subsystem users to
explicitly request the use of per-CPU behavior. Both WQ_UNBOUND and
WQ_PERCPU flags coexist for one release cycle to allow callers to
transition their calls. WQ_UNBOUND will be removed in a next release
cycle.

/* Testing */

gcc (Debian 14.2.0-19) 14.2.0
Debian clang version 19.1.7 (3+b1)

No build failures or warnings were observed.

/* Conflicts */

Merge conflicts with mainline
=============================

No known conflicts.

Merge conflicts with other trees
================================

[1] https://lore.kernel.org/linux-next/aNEKzrMMxLAVHGIn@finisterre.sirena.org.uk
    This will have a merge conflict with changes in the quota tree.
    Steven's proposed resolution is correct.

No known conflicts.

The following changes since commit 8f5ae30d69d7543eee0d70083daf4de8fe15d585:

  Linux 6.17-rc1 (2025-08-10 19:41:16 +0300)

are available in the Git repository at:

  git@...olite.kernel.org:pub/scm/linux/kernel/git/vfs/vfs tags/vfs-6.18-rc1.workqueue

for you to fetch changes up to 56ce6c8b11a95c65764e27cb6021b1e98ccc4212:

  Merge patch series "fs: replace wq users and add WQ_PERCPU to alloc_workqueue() users" (2025-09-19 16:15:12 +0200)

Please consider pulling these changes from the signed vfs-6.18-rc1.workqueue tag.

Thanks!
Christian

----------------------------------------------------------------
vfs-6.18-rc1.workqueue

----------------------------------------------------------------
Christian Brauner (1):
      Merge patch series "fs: replace wq users and add WQ_PERCPU to alloc_workqueue() users"

Marco Crivellari (3):
      fs: replace use of system_unbound_wq with system_dfl_wq
      fs: replace use of system_wq with system_percpu_wq
      fs: WQ_PERCPU added to alloc_workqueue users

 fs/afs/callback.c                |  4 ++--
 fs/afs/main.c                    |  4 ++--
 fs/afs/write.c                   |  2 +-
 fs/aio.c                         |  2 +-
 fs/bcachefs/btree_write_buffer.c |  2 +-
 fs/bcachefs/io_read.c            |  8 ++++----
 fs/bcachefs/journal_io.c         |  2 +-
 fs/bcachefs/super.c              | 10 +++++-----
 fs/btrfs/block-group.c           |  2 +-
 fs/btrfs/disk-io.c               |  2 +-
 fs/btrfs/extent_map.c            |  2 +-
 fs/btrfs/space-info.c            |  4 ++--
 fs/btrfs/zoned.c                 |  2 +-
 fs/ceph/super.c                  |  2 +-
 fs/coredump.c                    |  2 +-
 fs/dlm/lowcomms.c                |  2 +-
 fs/dlm/main.c                    |  2 +-
 fs/ext4/mballoc.c                |  2 +-
 fs/fs-writeback.c                |  4 ++--
 fs/fuse/dev.c                    |  2 +-
 fs/fuse/inode.c                  |  2 +-
 fs/gfs2/main.c                   |  5 +++--
 fs/gfs2/ops_fstype.c             |  6 ++++--
 fs/netfs/misc.c                  |  2 +-
 fs/netfs/objects.c               |  2 +-
 fs/nfs/namespace.c               |  2 +-
 fs/nfs/nfs4renewd.c              |  2 +-
 fs/nfsd/filecache.c              |  2 +-
 fs/notify/mark.c                 |  4 ++--
 fs/ocfs2/dlm/dlmdomain.c         |  3 ++-
 fs/ocfs2/dlmfs/dlmfs.c           |  3 ++-
 fs/quota/dquot.c                 |  2 +-
 fs/smb/client/cifsfs.c           | 16 +++++++++++-----
 fs/smb/server/ksmbd_work.c       |  2 +-
 fs/smb/server/transport_rdma.c   |  3 ++-
 fs/super.c                       |  3 ++-
 fs/verity/verify.c               |  2 +-
 fs/xfs/xfs_log.c                 |  3 +--
 fs/xfs/xfs_mru_cache.c           |  3 ++-
 fs/xfs/xfs_super.c               | 15 ++++++++-------
 40 files changed, 79 insertions(+), 65 deletions(-)