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Date: Sat, 18 Apr 2009 17:23:41 +0200
From: "Rafael J. Wysocki" <rjw@...k.pl>
To: Alan Jenkins <alan-jenkins@...fmail.co.uk>
Cc: Linus Torvalds <torvalds@...ux-foundation.org>,
Jens Axboe <jens.axboe@...cle.com>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Kernel Testers List <kernel-testers@...r.kernel.org>
Subject: [PATCH] PM/Hibernate: Fix memory shrinking (Re: [Bug #13058] First hibernation attempt fails)
On Saturday 18 April 2009, Alan Jenkins wrote:
> Rafael J. Wysocki wrote:
> > On Saturday 18 April 2009, Alan Jenkins wrote:
> >
> >> Linus Torvalds wrote:
> >>
> >>> On Fri, 17 Apr 2009, Rafael J. Wysocki wrote:
> >>>
> >>>
> >>>> Can you please try to reproduce the problem with the appended debug patch
> >>>> applied and send the output of dmesg to me?
> >>>>
> >>>>
> >>> Maybe something like this instead (or in addition to).
> >>>
> >>> It does "show_mem()" when memory shrinking fails. It will show a _lot_ of
> >>> data.
> >>>
> >>> Untested, but trivial.
> >>>
> >>> Linus
> >>> ---
> >>>
> >>>
> >> Ok, I applied both your and Rafael's debug patches. dmesg attached.
> >>
> >> After the failed hibernation, I noticed my touchpad wasn't working. But
> >> I think that's something else. I had another go and couldn't reproduce
> >> that. It's happened to me once before while testing 2.6.30-; I've also
> >> had the keyboard stop working at least once. I'm hoping it's the same
> >> bug as "20 ACPI interrupts per second on EEEPC" bug. It could be
> >> overloading my bug-ridden EC, which also acts as the keyboard controller.
> >>
> >
> > Thanks for testing!
> >
> > Clearly, sc.nr_reclaimed is reset in each iteration of the loop in
> > shrink_all_memory():
> >
> > [ 61.135207] PM: Shrinking memory... <6>before: sc.nr_reclaimed = 0
> > [ 61.180993] pass = 0, prio = 12, sc.nr_reclaimed = 0
> > [ 61.181004] pass = 0, prio = 11, sc.nr_reclaimed = 0
> > [ 61.181014] pass = 0, prio = 10, sc.nr_reclaimed = 0
> > [ 61.181024] pass = 0, prio = 9, sc.nr_reclaimed = 0
> > [ 61.181033] pass = 0, prio = 8, sc.nr_reclaimed = 0
> > [ 61.181043] pass = 0, prio = 7, sc.nr_reclaimed = 0
> > [ 61.186509] pass = 0, prio = 6, sc.nr_reclaimed = 0
> > [ 61.186525] pass = 0, prio = 5, sc.nr_reclaimed = 0
> > [ 61.186534] pass = 0, prio = 4, sc.nr_reclaimed = 0
> > [ 61.186544] pass = 0, prio = 3, sc.nr_reclaimed = 0
> > [ 61.333383] pass = 0, prio = 2, sc.nr_reclaimed = 7746
> > [ 61.436711] pass = 0, prio = 1, sc.nr_reclaimed = 1957
> > [ 61.556712] pass = 0, prio = 0, sc.nr_reclaimed = 4528
> > [ 61.556729] pass = 1, prio = 12, sc.nr_reclaimed = 0
> > [ 61.556739] pass = 1, prio = 11, sc.nr_reclaimed = 0
> > [ 61.556749] pass = 1, prio = 10, sc.nr_reclaimed = 0
> > [ 61.556759] pass = 1, prio = 9, sc.nr_reclaimed = 0
> > [ 61.556768] pass = 1, prio = 8, sc.nr_reclaimed = 0
> > [ 61.556778] pass = 1, prio = 7, sc.nr_reclaimed = 0
> > [ 61.556787] pass = 1, prio = 6, sc.nr_reclaimed = 0
> > [ 61.556797] pass = 1, prio = 5, sc.nr_reclaimed = 0
> > [ 61.556806] pass = 1, prio = 4, sc.nr_reclaimed = 0
> > [ 61.556816] pass = 1, prio = 3, sc.nr_reclaimed = 0
> > [ 61.556825] pass = 1, prio = 2, sc.nr_reclaimed = 0
> > [ 61.556835] pass = 1, prio = 1, sc.nr_reclaimed = 0
> > [ 61.595841] pass = 1, prio = 0, sc.nr_reclaimed = 0
> > [ 61.595854] pass = 2, prio = 12, sc.nr_reclaimed = 0
> > [ 61.595864] pass = 2, prio = 11, sc.nr_reclaimed = 0
> > [ 61.595873] pass = 2, prio = 10, sc.nr_reclaimed = 0
> > [ 61.595883] pass = 2, prio = 9, sc.nr_reclaimed = 0
> > [ 61.710044] pass = 2, prio = 8, sc.nr_reclaimed = 2895
> > [ 61.710062] pass = 2, prio = 7, sc.nr_reclaimed = 0
> > [ 61.710072] pass = 2, prio = 6, sc.nr_reclaimed = 0
> > [ 61.710081] pass = 2, prio = 5, sc.nr_reclaimed = 0
> > [ 61.710091] pass = 2, prio = 4, sc.nr_reclaimed = 0
> > [ 61.710100] pass = 2, prio = 3, sc.nr_reclaimed = 0
> > [ 61.710110] pass = 2, prio = 2, sc.nr_reclaimed = 0
> > [ 61.710119] pass = 2, prio = 1, sc.nr_reclaimed = 0
> > [ 61.823378] pass = 2, prio = 0, sc.nr_reclaimed = 1802
> > [ 61.823396] pass = 3, prio = 12, sc.nr_reclaimed = 0
> > [ 61.823406] pass = 3, prio = 11, sc.nr_reclaimed = 0
> > [ 61.823416] pass = 3, prio = 10, sc.nr_reclaimed = 0
> > [ 61.823425] pass = 3, prio = 9, sc.nr_reclaimed = 0
> > [ 61.823435] pass = 3, prio = 8, sc.nr_reclaimed = 0
> > [ 61.823444] pass = 3, prio = 7, sc.nr_reclaimed = 0
> > [ 61.823454] pass = 3, prio = 6, sc.nr_reclaimed = 0
> > [ 61.823464] pass = 3, prio = 5, sc.nr_reclaimed = 0
> > [ 61.823473] pass = 3, prio = 4, sc.nr_reclaimed = 0
> > [ 61.823483] pass = 3, prio = 3, sc.nr_reclaimed = 0
> > [ 61.823492] pass = 3, prio = 2, sc.nr_reclaimed = 0
> > [ 61.823502] pass = 3, prio = 1, sc.nr_reclaimed = 0
> > [ 62.586707] pass = 3, prio = 0, sc.nr_reclaimed = 2716
> > [ 62.608037] pass = 4, prio = 12, sc.nr_reclaimed = 3070
> > [ 62.634644] pass = 4, prio = 11, sc.nr_reclaimed = 5048
> > [ 62.638782] pass = 4, prio = 10, sc.nr_reclaimed = 192
> > [ 62.740052] pass = 4, prio = 9, sc.nr_reclaimed = 0
> > [ 62.843385] pass = 4, prio = 8, sc.nr_reclaimed = 640
> > [ 62.946726] pass = 4, prio = 7, sc.nr_reclaimed = 640
> > [ 63.046711] pass = 4, prio = 6, sc.nr_reclaimed = 640
> > [ 63.146717] pass = 4, prio = 5, sc.nr_reclaimed = 608
> > [ 63.246712] pass = 4, prio = 4, sc.nr_reclaimed = 600
> > [ 63.346704] pass = 4, prio = 3, sc.nr_reclaimed = 128
> > [ 63.446698] pass = 4, prio = 2, sc.nr_reclaimed = 0
> > [ 63.546705] pass = 4, prio = 1, sc.nr_reclaimed = 0
> > [ 63.646698] pass = 4, prio = 0, sc.nr_reclaimed = 0
> > [ 63.646708] after: sc.nr_reclaimed = 0
> > [ 63.646715] shrink_all_memory(10000) failed
> >
> > which obviously is done by shrink_all_zones(). Sigh.
> >
> > The appended patch should help, please verify.
> >
>
> Yes, that fixes it.
---
From: Rafael J. Wysocki <rjw@...k.pl>
Subject: PM/Hibernate: Fix memory shrinking
Commit d979677c4c02f0a72db5a03ecd8184bd9d6695c8
(mm: shrink_all_memory(): use sc.nr_reclaimed) broke the memory
shrinking used by hibernation, becuse it did not update
shrink_all_zones() in accordance with the other changes it made.
Fix this by making shrink_all_zones() update sc->nr_reclaimed instead
of overwriting its value.
Signed-off-by: Rafael J. Wysocki <rjw@...k.pl>
---
mm/vmscan.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
Index: linux-2.6/mm/vmscan.c
===================================================================
--- linux-2.6.orig/mm/vmscan.c
+++ linux-2.6/mm/vmscan.c
@@ -2088,13 +2088,13 @@ static void shrink_all_zones(unsigned lo
nr_reclaimed += shrink_list(l, nr_to_scan, zone,
sc, prio);
if (nr_reclaimed >= nr_pages) {
- sc->nr_reclaimed = nr_reclaimed;
+ sc->nr_reclaimed += nr_reclaimed;
return;
}
}
}
}
- sc->nr_reclaimed = nr_reclaimed;
+ sc->nr_reclaimed += nr_reclaimed;
}
/*
@@ -2115,6 +2115,7 @@ unsigned long shrink_all_memory(unsigned
.may_unmap = 0,
.may_writepage = 1,
.isolate_pages = isolate_pages_global,
+ .nr_reclaimed = 0,
};
current->reclaim_state = &reclaim_state;
--
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