Finn Thain writes:
On Sun, 21 Feb 2016, Mikael Pettersson wrote:
I've done two git bisects on this. The first one was inconclusive
(pointed to a harmless commit), but the second one ended up with:
# first bad commit: [ac4de9543aca59f2b763746647577302fbedd57e] Merge branch 'akpm' (patches from Andrew Morton)
That's a big pile of VM changes, so I think it could be the culprit.
I think this issue may date back to v2.6.38 or earlier.
The redhat.com bug report was closed in 2012 but Fedora users were still
seeing the problem after it was supposedly fixed.
https://bugzilla.redhat.com/show_bug.cgi?id=712019
That page also has a link to the bug report for Ubuntu:
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/484045
BTW, I came across this recently: "Rik van Riel pointed out that [the
kswapd thread] tends to be slow for [the purpose of compaction], and it
can get stuck in a shrinker somewhere waiting for a lock."
http://lwn.net/Articles/684611/
Perhaps a stack trace would help to ascertain whether this is the same
known bug or not (?)
--
FWIW, my latest round(s) of bisects identified the following:
fdbadebec27cc92358ed4f593e8763cf10b82687 is the first bad commit
commit fdbadebec27cc92358ed4f593e8763cf10b82687
Author: Li Zefan <lizefan@xxxxxxxxxx>
Date: Thu Sep 12 15:13:19 2013 -0700
memcg: remove redundant code in mem_cgroup_force_empty_write()
vfs guarantees the cgroup won't be destroyed, so it's redundant to get a
css reference.
Signed-off-by: Li Zefan <lizefan@xxxxxxxxxx>
Acked-by: Michal Hocko <mhocko@xxxxxxx>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
:040000 040000 1f6b5b056995067c7c60e6f87e9cd1f181e8fbeb ea29d63e70ce2320e144fac7b157a146d41360bf M mm
This appears to be the first commit in the merge (git bisect refuses to
bisect before it), so either it's it or the problem predates the merge.
--
To unsubscribe from this list: send the line "unsubscribe linux-m68k" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
