linux-kernel - [PATCH 0/3] fs/file.c: optimize the critical section of

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Message-ID: <20240614163416.728752-1-yu.ma@intel.com>
Date: Fri, 14 Jun 2024 12:34:13 -0400
From: Yu Ma <yu.ma@...el.com>
To: viro@...iv.linux.org.uk,
	brauner@...nel.org,
	jack@...e.cz
Cc: linux-fsdevel@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	tim.c.chen@...ux.intel.com,
	tim.c.chen@...el.com,
	pan.deng@...el.com,
	tianyou.li@...el.com,
	yu.ma@...el.com
Subject: [PATCH 0/3] fs/file.c: optimize the critical section of

pts/blogbench-1.1.0 is a benchmark designed to replicate the
load of a real-world busy file server by multiple threads of
random reads, writes, and rewrites. When running default configuration
with multiple parallel threads, hot spin lock contention is observed
from alloc_fd(), file_closed_fd() and put_unused_fd() around file_lock.

These 3 patches are created to reduce the critical section of file_lock
in alloc_fd() and close_fd(). As a result, pts/blogbench-1.1.0 has been
improved by 32% for read and 15% for write with over 30% kernel cycles
reduced on ICX 160 cores configuration with v6.8-rc6.

Yu Ma (3):
  fs/file.c: add fast path in alloc_fd()
  fs/file.c: conditionally clear full_fds
  fs/file.c: move sanity_check from alloc_fd() to put_unused_fd()

 fs/file.c | 27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

-- 
2.43.0