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mm: multi-gen LRU: section for working set protection

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Patch series "mm: multi-gen LRU: improve".

This patch series improves a few MGLRU functions, collects related
functions, and adds additional documentation.


This patch (of 7):

Add a section for working set protection in the code and the design doc. 
The admin doc already contains its usage.

Link: https://lkml.kernel.org/r/20230118001827.1040870-1-talumbau@google.com
Link: https://lkml.kernel.org/r/20230118001827.1040870-2-talumbau@google.com
Signed-off-by: T.J. Alumbaugh <talumbau@google.com>
Cc: Yu Zhao <yuzhao@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
T.J. Alumbaugh 2023-01-18 00:18:21 +00:00 committed by Andrew Morton
parent b2db9ef2c0
commit 7b8144e63d
2 changed files with 19 additions and 0 deletions
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15
Documentation/mm/multigen_lru.rst
View File

@ -141,6 +141,21 @@ loop has detected outlying refaults from the tier this page is in. To
this end, the feedback loop uses the first tier as the baseline, for
the reason stated earlier.
Working set protection
----------------------
Each generation is timestamped at birth. If ``lru_gen_min_ttl`` is
set, an ``lruvec`` is protected from the eviction when its oldest
generation was born within ``lru_gen_min_ttl`` milliseconds. In other
words, it prevents the working set of ``lru_gen_min_ttl`` milliseconds
from getting evicted. The OOM killer is triggered if this working set
cannot be kept in memory.
This time-based approach has the following advantages:
1. It is easier to configure because it is agnostic to applications
and memory sizes.
2. It is more reliable because it is directly wired to the OOM killer.
Summary
-------
The multi-gen LRU can be disassembled into the following parts:

4
mm/vmscan.c
View File

@ -4475,6 +4475,10 @@ done:
return true;
}
/******************************************************************************
* working set protection
******************************************************************************/
static bool lruvec_is_sizable(struct lruvec *lruvec, struct scan_control *sc)
{
int gen, type, zone;