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| author |   Yu Ma <yu.ma@intel.com> | 2024-07-17 10:50:17 -0400 |
|---|---|---|
| committer |   Al Viro <viro@zeniv.linux.org.uk> | 2024-10-07 13:34:41 -0400 |
| commit | c9a3019603b8a8519f1b6d8ae0059bcb2965f8fe (patch) | |
| tree | 1bf67638f836dbbad565c90b35cf96f4d95936a1 /scripts/gdb/linux/modules.py | |
| parent | fs/file.c: remove sanity_check and add likely/unlikely in alloc_fd() (diff) | |
| download | wireguard-linux-c9a3019603b8a8519f1b6d8ae0059bcb2965f8fe.tar.xz wireguard-linux-c9a3019603b8a8519f1b6d8ae0059bcb2965f8fe.zip | |
fs/file.c: conditionally clear full_fds
64 bits in open_fds are mapped to a common bit in full_fds_bits. It is very
likely that a bit in full_fds_bits has been cleared before in
__clear_open_fds()'s operation. Check the clear bit in full_fds_bits before
clearing to avoid unnecessary write and cache bouncing. See commit fc90888d07b8
("vfs: conditionally clear close-on-exec flag") for a similar optimization.
take stock kernel with patch 1 as baseline, it improves pts/blogbench-1.1.0
read for 13%, and write for 5% on Intel ICX 160 cores configuration with
v6.10-rc7.
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Tim Chen <tim.c.chen@linux.intel.com>
Signed-off-by: Yu Ma <yu.ma@intel.com>
Link: https://lore.kernel.org/r/20240717145018.3972922-3-yu.ma@intel.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'scripts/gdb/linux/modules.py')
0 files changed, 0 insertions, 0 deletions