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linux/Documentation/admin-guide/sysctl
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Sebastian Andrzej Siewior 6923aa0d8c mm/compaction: Disable compact_unevictable_allowed on RT 
Since commit 5bbe3547aa ("mm: allow compaction of unevictable pages")
it is allowed to examine mlocked pages and compact them by default.  On
-RT even minor pagefaults are problematic because it may take a few 100us
to resolve them and until then the task is blocked.

Make compact_unevictable_allowed = 0 default and issue a warning on RT if
it is changed.

[bigeasy@linutronix.de: v5]
  Link: https://lore.kernel.org/linux-mm/20190710144138.qyn4tuttdq6h7kqx@linutronix.de/
  Link: http://lkml.kernel.org/r/20200319165536.ovi75tsr2seared4@linutronix.de
Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Andrew Morton <akpm@linux-foundation.org>
Acked-by: Mel Gorman <mgorman@techsingularity.net>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Luis Chamberlain <mcgrof@kernel.org>
Cc: Kees Cook <keescook@chromium.org>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Link: https://lore.kernel.org/linux-mm/20190710144138.qyn4tuttdq6h7kqx@linutronix.de/
Link: http://lkml.kernel.org/r/20200303202225.nhqc3v5gwlb7x6et@linutronix.de
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-04-02 09:35:31 -07:00
..
abi.rst docs: admin-guide: move sysctl directory to it 2019-07-15 11:03:01 -03:00
fs.rst docs: admin-guide: move sysctl directory to it 2019-07-15 11:03:01 -03:00
index.rst docs: admin-guide: move sysctl directory to it 2019-07-15 11:03:01 -03:00
kernel.rst Documentation: Better document the softlockup_panic sysctl 2020-03-10 13:55:55 -06:00
net.rst bpf, doc: Add BPF JIT for RV32G to BPF documentation 2020-03-05 16:13:47 +01:00
sunrpc.rst docs: admin-guide: move sysctl directory to it 2019-07-15 11:03:01 -03:00
user.rst docs: admin-guide: move sysctl directory to it 2019-07-15 11:03:01 -03:00
vm.rst mm/compaction: Disable compact_unevictable_allowed on RT 2020-04-02 09:35:31 -07:00