Commits on Jul 24, 2024

1. Several improvements to ARC shrinking …

    - When receiving memory pressure signal from OS be more strict
   trying to free some memory.  Otherwise kernel may come again and
   request much more.  Return as result how much arc_c was actually
   reduced due to this request, that may be less than requested.
    - On Linux when receiving direct reclaim from some file system
   (that may be ZFS) instead of ignoring request completely, just
   shrink the ARC, but do not wait for eviction.  Waiting there may
   cause deadlock.  Ignoring it as before may put extra pressure on
   other caches and/or swap, and cause OOM if nothing help.  While
   not waiting may result in more ARC evicted later, and may be too
   late if OOM killer activate right now, but I hope it to be better
   than doing nothing at all.
    - On Linux set arc_no_grow before waiting for reclaim, not after,
   or it may grow back while we are waiting.
    - On Linux add new parameter zfs_arc_shrinker_seeks to balance
   ARC eviction cost, relative to page cache and other subsystems.
    - Slightly update Linux arc_set_sys_free() math for new kernels.
   
   Signed-off-by:	Alexander Motin <[email protected]>
   Sponsored by:	iXsystems, Inc.

   

   amotin committed Jul 24, 2024
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