| commit | 1332a809d95a4fc763cabe5ecb6d4fb6a6d941b2 | [log] [tgz] |
|---|---|---|
| author | Yu Zhao <[email protected]> | Sun Sep 18 02:00:08 2022 -0600 |
| committer | Andrew Morton <[email protected]> | Mon Sep 26 19:46:10 2022 -0700 |
| tree | 728bcd584840912639227175a0acae34c28d4765 | |
| parent | 354ed597442952fb680c9cafc7e4eb8a76f9514c [diff] |
mm: multi-gen LRU: thrashing prevention Add /sys/kernel/mm/lru_gen/min_ttl_ms for thrashing prevention, as requested by many desktop users [1]. When set to value N, it prevents the working set of N milliseconds from getting evicted. The OOM killer is triggered if this working set cannot be kept in memory. Based on the average human detectable lag (~100ms), N=1000 usually eliminates intolerable lags due to thrashing. Larger values like N=3000 make lags less noticeable at the risk of premature OOM kills. Compared with the size-based approach [2], 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. [1] https://lore.kernel.org/r/Ydza%[email protected]/ [2] https://lore.kernel.org/r/[email protected]/ Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Yu Zhao <[email protected]> Acked-by: Brian Geffon <[email protected]> Acked-by: Jan Alexander Steffens (heftig) <[email protected]> Acked-by: Oleksandr Natalenko <[email protected]> Acked-by: Steven Barrett <[email protected]> Acked-by: Suleiman Souhlal <[email protected]> Tested-by: Daniel Byrne <[email protected]> Tested-by: Donald Carr <[email protected]> Tested-by: Holger Hoffstätte <[email protected]> Tested-by: Konstantin Kharlamov <[email protected]> Tested-by: Shuang Zhai <[email protected]> Tested-by: Sofia Trinh <[email protected]> Tested-by: Vaibhav Jain <[email protected]> Cc: Andi Kleen <[email protected]> Cc: Aneesh Kumar K.V <[email protected]> Cc: Barry Song <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: Dave Hansen <[email protected]> Cc: Hillf Danton <[email protected]> Cc: Jens Axboe <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Jonathan Corbet <[email protected]> Cc: Linus Torvalds <[email protected]> Cc: Matthew Wilcox <[email protected]> Cc: Mel Gorman <[email protected]> Cc: Miaohe Lin <[email protected]> Cc: Michael Larabel <[email protected]> Cc: Michal Hocko <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Peter Zijlstra <[email protected]> Cc: Qi Zheng <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Vlastimil Babka <[email protected]> Cc: Will Deacon <[email protected]> Signed-off-by: Andrew Morton <[email protected]>