linux-kernel - [PATCH v2 0/3] mm: Make unregistration of super

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Date:   Mon,  5 Jun 2023 22:02:46 +0300
From:   Kirill Tkhai <tkhai@...ru>
To:     akpm@...ux-foundation.org, tkhai@...ru, roman.gushchin@...ux.dev,
        vbabka@...e.cz, viro@...iv.linux.org.uk, brauner@...nel.org,
        djwong@...nel.org, hughd@...gle.com, paulmck@...nel.org,
        muchun.song@...ux.dev, linux-mm@...ck.org,
        linux-fsdevel@...r.kernel.org, linux-xfs@...r.kernel.org,
        linux-kernel@...r.kernel.org, zhengqi.arch@...edance.com,
        david@...morbit.com
Subject: [PATCH v2 0/3] mm: Make unregistration of super_block shrinker more faster

This patch set introduces a new scheme of shrinker unregistration. It allows to split
the unregistration in two parts: fast and slow. This allows to hide slow part from
a user, so user-visible unregistration becomes fast.

This fixes the -88.8% regression of stress-ng.ramfs.ops_per_sec noticed
by kernel test robot:

https://lore.kernel.org/lkml/202305230837.db2c233f-yujie.liu@intel.com/

---

Kirill Tkhai (2):
      mm: Split unregister_shrinker() in fast and slow part
      fs: Use delayed shrinker unregistration

Qi Zheng (1):
      mm: vmscan: move shrinker_debugfs_remove() before synchronize_srcu()


 fs/super.c               |    3 ++-
 include/linux/shrinker.h |    4 ++++
 mm/vmscan.c              |   39 +++++++++++++++++++++++++++++++--------
 3 files changed, 37 insertions(+), 9 deletions(-)

--
Signed-off-by: Kirill Tkhai <tkhai@...ru>