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The Meta prod is seeing large amount of stalls in memcg stats flush from the memcg reclaim code path. At the moment, this specific callsite is doing a synchronous memcg stats flush. The rstat flush is an expensive and time consuming operation, so concurrent relaimers will busywait on the lock potentially for a long time. Actually this issue is not unique to Meta and has been observed by Cloudflare [1] as well. For the Cloudflare case, the stalls were due to contention between kswapd threads running on their 8 numa node machines which does not make sense as rstat flush is global and flush from one kswapd thread should be sufficient for all. Simply replace the synchronous flush with the ratelimited one. One may raise a concern on potentially using 2 sec stale (at worst) stats for heuristics like desirable inactive:active ratio and preferring inactive file pages over anon pages but these specific heuristics do not require very precise stats and also are ignored under severe memory pressure. More specifically for this code path, the stats are needed for two specific heuristics: 1. Deactivate LRUs 2. Cache trim mode The deactivate LRUs heuristic is to maintain a desirable inactive:active ratio of the LRUs. The specific stats needed are WORKINGSET_ACTIVATE* and the hierarchical LRU size. The WORKINGSET_ACTIVATE* is needed to check if there is a refault since last snapshot and the LRU size are needed for the desirable ratio between inactive and active LRUs. See the table below on how the desirable ratio is calculated. /* total target max * memory ratio inactive * ------------------------------------- * 10MB 1 5MB * 100MB 1 50MB * 1GB 3 250MB * 10GB 10 0.9GB * 100GB 31 3GB * 1TB 101 10GB * 10TB 320 32GB */ The desirable ratio only changes at the boundary of 1 GiB, 10 GiB, 100 GiB, 1 TiB and 10 TiB. There is no need for the precise and accurate LRU size information to calculate this ratio. In addition, if deactivation is skipped for some LRU, the kernel will force deactive on the severe memory pressure situation. For the cache trim mode, inactive file LRU size is read and the kernel scales it down based on the reclaim iteration (file >> sc->priority) and only checks if it is zero or not. Again precise information is not needed. This patch has been running on Meta fleet for several months and we have not observed any issues. Please note that MGLRU is not impacted by this issue at all as it avoids rstat flushing completely. Link: https://lore.kernel.org/all/6ee2518b-81dd-4082-bdf5-322883895ffc@kernel.org [1] Link: https://lkml.kernel.org/r/20240813215358.2259750-1-shakeel.butt@linux.dev Signed-off-by: Shakeel Butt <shakeel.butt@linux.dev> Cc: Jesper Dangaard Brouer <hawk@kernel.org> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Muchun Song <muchun.song@linux.dev> Cc: Roman Gushchin <roman.gushchin@linux.dev> Cc: Yosry Ahmed <yosryahmed@google.com> Cc: Yu Zhao <yuzhao@google.com> Cc: Nhat Pham <nphamcs@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
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Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.