linux-kernel - [PATCHv2 0/3] z3fold: background page compaction

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Message-Id: <20161020235017.d68ab1ff83d6f246fa3d7ee2@gmail.com>
Date:   Thu, 20 Oct 2016 23:50:17 +0200
From:   Vitaly Wool <vitalywool@...il.com>
To:     Linux-MM <linux-mm@...ck.org>, linux-kernel@...r.kernel.org
Cc:     Dan Streetman <ddstreet@...e.org>,
        Andrew Morton <akpm@...ux-foundation.org>
Subject: [PATCHv2 0/3] z3fold: background page compaction

The coming patchset is another take on z3fold page layout
optimization problem. The previous solution [1] used
shrinker to solve the issue of in-page space fragmentation
but after some discussions the decision was made to rewrite
background page layout optimization using good old work
queues.

The patchset thus implements in-page compaction worker for
z3fold, preceded by some code optimizations and preparations
which, again, deserved to be separate patches.

Main changes compared to v1:
- per-page locking is removed due to size problems (z3fold
  header becomes greater than one chunk on x86_64 with gcc
  6.0) and non-obvious performance benefits
- instead, per-pool spinlock is substituted with rwlock.

Signed-off-by: Vitaly Wool <vitalywool@...il.com>

[1] https://lkml.org/lkml/2016/10/15/31