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mm/page-writeback: update the comment of Dirty position control

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As the value of pos_ratio_polynom() clamp between 0 and 2LL <<
RATELIMIT_CALC_SHIFT, the global control line should be consistent with
it.

Link: https://lkml.kernel.org/r/20210511103606.3732-1-wuchi.zero@gmail.com
Signed-off-by: Chi Wu <wuchi.zero@gmail.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Cc: Jens Axboe <axboe@fb.com>
Cc: Howard Cochran <hcochran@kernelspring.com>
Cc: Miklos Szeredi <mszeredi@redhat.com>
Cc: Sedat Dilek <sedat.dilek@gmail.com>
Cc: Tejun Heo <tj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Chi Wu 2021-06-28 19:35:34 -07:00 committed by Linus Torvalds
parent ab19939a6a
commit 0323155437
1 changed files with 1 additions and 1 deletions
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mm/page-writeback.c
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@ -845,7 +845,7 @@ static long long pos_ratio_polynom(unsigned long setpoint,
* ^ pos_ratio
* |
* | |<===== global dirty control scope ======>|
* 2.0 .............*
* 2.0 * * * * * * *
* | .*
* | . *
* | . *