linux-kernel - [PATCHv4 0/4] zsmalloc: fine-grained fullness and new compaction algorithm

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Date:   Sat,  4 Mar 2023 12:48:31 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Minchan Kim <minchan@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     Yosry Ahmed <yosryahmed@...gle.com>, linux-kernel@...r.kernel.org,
        linux-mm@...ck.org, Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: [PATCHv4 0/4] zsmalloc: fine-grained fullness and new compaction algorithm

	Hi,

Existing zsmalloc page fullness grouping leads to suboptimal page
selection for both zs_malloc() and zs_compact(). This patchset
reworks zsmalloc fullness grouping/classification.

Additinally it also implements new compaction algorithm that is
expected to use less CPU-cycles (as it potentially does fewer
memcpy-s in zs_object_copy()).

Test (synthetic) results can be seen in patch 0003.

v4:
-- fixed classes stats loop bug (Yosry)
-- fixed spelling errors (Andrew)
-- dropped some unnecessary hunks from the patches

v3:
-- reworked compaction algorithm implementation (Minchan)
-- keep existing stats and fullness enums (Minchan, Yosry)
-- dropped the patch with new zsmalloc compaction stats (Minchan)
-- report per inuse ratio group classes stats

Sergey Senozhatsky (4):
  zsmalloc: remove insert_zspage() ->inuse optimization
  zsmalloc: fine-grained inuse ratio based fullness grouping
  zsmalloc: rework compaction algorithm
  zsmalloc: show per fullness group class stats

 mm/zsmalloc.c | 358 ++++++++++++++++++++++++--------------------------
 1 file changed, 173 insertions(+), 185 deletions(-)

-- 
2.40.0.rc0.216.gc4246ad0f0-goog