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Old 06-20-2011, 01:52 PM
Tim Gardner
Default APPLIED kswapd consumes CPU during heavy I/O

On 06/17/2011 04:06 AM, Colin King wrote:

From: Colin Ian King<colin.king@canonical.com>

SRU Request:

System hangs have been observed when performing heavy I/O on
sandybridge systems with small memory footprints (for example,
less than 2GB of memory). kswapd consumes all the CPU and the
machine effectively becomes unusable because kswapd is missing
every cond_resched(). Also, we need to invert the logic in
commit 1741c877 ("mm: kswapd: keep kswapd awake for high-order
allocations until a percentage of the node is balanced") to
allow kswapd to go to sleep when balanced for high orders.

Testing involved multiply copying ~600MB of files from an install
image on a laptop with 2GB of memory. A 2.5 hour (150 iteration)
soak test cannot trip the hang with these patches, where as
without them the bug occurs in the first 5 to 30 iterations.

BugLink: http://bugs.launchpad.net/bugs/755066

Patches cherry-picked from upstream and are in GregKH's stable

Johannes Weiner (1):
mm: vmscan: correct use of pgdat_balanced in sleeping_prematurely

Minchan Kim (1):
mm: vmscan: correctly check if reclaimer should schedule during

mm/vmscan.c | 11 ++++++++---
1 files changed, 8 insertions(+), 3 deletions(-)

Tim Gardner tim.gardner@canonical.com

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