Re: [PATCH 0/4] Fix compaction stalls due to accounting errors in isolated page accounting

[Thomas Sattler <tsattler@gmx.de>]

Hi there ...

> Re-verification from testers that these patches really do fix their
> problems would be appreciated. Even if hangs disappear, please confirm
> that the values for nr_isolated_anon and nr_isolated_file in *both*
> /proc/zoneinfo and /proc/vmstat are sensible (i.e. usually zero).

I applied these patches to 2.6.38.8 and it run for nearly a month
without any problems. Even Though I did not check nr_isolated_*.
As (at least) patch3 made it into 2.6.39.3 I did not apply the
others any more. And it occurred again this morning:


  sysload at 2, iowait at 80% on an idle (single core) system


$ grep nr_isolated /proc/zoneinfo /proc/vmstat
/proc/zoneinfo:    nr_isolated_anon 0
/proc/zoneinfo:    nr_isolated_file 1
/proc/zoneinfo:    nr_isolated_anon 0
/proc/zoneinfo:    nr_isolated_file 4294967295
/proc/zoneinfo:    nr_isolated_anon 0
/proc/zoneinfo:    nr_isolated_file 0
/proc/vmstat:nr_isolated_anon 0
/proc/vmstat:nr_isolated_file 0

I captured several SysRq-* logs, in case they're of interest.

Thomas

--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@kvack.org.  For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>