Chmouel Boudjnah a écrit :
Hi,
Hey chmouel,
Nice to see you ;)
Using GFS on RHEL4 (kernel 2.6.9-22.0.2.ELsmp) i got a crash with
it.
Before in the dmesg, there is some OOM-Killer activity with httpd.
It seems to get something to do with the HIGHMEM and the 4GB of RAM.
I don't know if its related directly with your troubles but I saw this
in the 2.6.11 changelog:
[PATCH] vmscan: count writeback pages in nr_scanned
OOM kills have been observed with 70% of the pages in lowmem being in the
writeback state. If we count those pages in sc->nr_scanned, the VM should
throttle and wait for IO completion, instead of OOM killing.
(akpm: this is how the code was designed to work - we broke it six months
ago).
<andrea@xxxxxxx>
[PATCH] mm: adjust dirty threshold for lowmem-only mappings
With Rik van Riel <riel@xxxxxxxxxx>
Simply running "dd if=/dev/zero of=/dev/hd<one you can miss>" can cause
excessive amounts of dirty lowmem pagecache, due to the blockdev's
non-highmem page allocation strategy.
This patch effectively lowers the dirty limit for mappings which cannot be
cached in highmem, counting the dirty limit as a percentage of lowmem
instead. This should prevent heavy block device writers from pushing the
VM over the edge and triggering OOM kills.
Signed-off-by: Rik van Riel <riel@xxxxxxxxxx>
Acked-by: Andrea Arcangeli <andrea@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
Signed-off-by: Linus Torvalds <torvalds@xxxxxxxx>
Erwan,
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