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Pavel Begunkov 661d4f55a7 sbitmap: remove swap_lock
map->swap_lock protects map->cleared from concurrent modification,
however sbitmap_deferred_clear() is already atomically drains it, so
it's guaranteed to not loose bits on concurrent
sbitmap_deferred_clear().

A one threaded tag heavy test on top of nullbk showed ~1.5% t-put
increase, and 3% -> 1% cycle reduction of sbitmap_get() according to perf.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
2020-12-07 17:12:49 -07:00
arch
block blk-mq: skip hybrid polling if iopoll doesn't spin 2020-12-07 16:49:04 -07:00
certs
crypto
Documentation
drivers
fs
include sbitmap: remove swap_lock 2020-12-07 17:12:49 -07:00
init
ipc
kernel blktrace: fix up a kerneldoc comment 2020-12-07 13:20:31 -07:00
lib sbitmap: remove swap_lock 2020-12-07 17:12:49 -07:00
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
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Please read the Documentation/process/changes.rst file, as it contains the
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