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| author | T.J. Alumbaugh <talumbau@google.com> | 2023-01-18 03:18:21 +0300 |
|---|---|---|
| committer | Andrew Morton <akpm@linux-foundation.org> | 2023-02-03 09:33:26 +0300 |
| commit | 7b8144e63d84716f16a1b929e0c7e03ae5c4d5c1 (patch) | |
| tree | 2fae6ecc7f9c29d6654fbffe929d53147c355010 /Documentation/mm | |
| parent | b2db9ef2c0926ba86898136704cdc757c7a5a60a (diff) | |
| download | linux-7b8144e63d84716f16a1b929e0c7e03ae5c4d5c1.tar.xz | |
mm: multi-gen LRU: section for working set protection
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>
Diffstat (limited to 'Documentation/mm')
| -rw-r--r-- | Documentation/mm/multigen_lru.rst | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/Documentation/mm/multigen_lru.rst b/Documentation/mm/multigen_lru.rst index d8f721f98868..6e1483e70fdc 100644 --- a/Documentation/mm/multigen_lru.rst +++ b/Documentation/mm/multigen_lru.rst @@ -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: |