lkml.org 
[lkml]   [2022]   [Jan]   [13]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
Subject[PATCH v3 0/2] kernfs: use hashed mutex and spinlock in place of global ones
Date
Reduce contention around global locks used in kernfs.

PATCH-1: Make global kernfs_open_file_mutex and kernfs_open_node_lock
hashed locks, where address of a kernfs_node acts as hash key.
This results in kernfs_node objects, whose address give the
different hash value, using different kernfs_open_file_mutex
and kernfs_open_node_lock rather than all kernfs_node objects
using the same kernfs_open_file_mutex and kernfs_open_node_lock
as was the case earlier.

PATCH-2: Use a hashed rw_semaphore to access permissions, so that we can
avoid contention around global per-fs rw_semaphore, seen if
multiple applications are executing inode_permission and
walk_component in parallel when trying to open sysfs file(s).

------------------------------------------------------------------

Changes since v2:
- Remove RFC tag
- Use hashed locks rather than using per kernfs_node specific lock
(Suggested by Tejun Heo <tj@kernel.org>)


Imran Khan (2):
kernfs: use hashed mutex and spinlock in place of global ones.
kernfs: Reduce contention around global per-fs kernfs_rwsem.

fs/kernfs/dir.c | 8 +++++
fs/kernfs/file.c | 65 ++++++++++++++++-----------------
fs/kernfs/inode.c | 35 ++++++++++++------
fs/kernfs/kernfs-internal.h | 71 +++++++++++++++++++++++++++++++++++++
fs/kernfs/mount.c | 11 ++++++
5 files changed, 146 insertions(+), 44 deletions(-)


base-commit: a70bf4a85b43cb952bd39dd948b103b1b3eb2cf8
--
2.30.2

\
 
 \ /
  Last update: 2022-01-13 11:43    [W:0.226 / U:0.252 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site