On 02/26/2014 03:13 PM, Johannes Weiner wrote:
Would this be an acceptable replacement for 1/2?
Looks reasonable to me. This should avoid the issues that
were observed with NUMA migrations.
---
From: Johannes Weiner <hannes@xxxxxxxxxxx>
Subject: [patch 1/2] mm: page_alloc: exempt GFP_THISNODE allocations from zone
fairness
Jan Stancek reports manual page migration encountering allocation
failures after some pages when there is still plenty of memory free,
and bisected the problem down to 81c0a2bb515f ("mm: page_alloc: fair
zone allocator policy").
The problem is that GFP_THISNODE obeys the zone fairness allocation
batches on one hand, but doesn't reset them and wake kswapd on the
other hand. After a few of those allocations, the batches are
exhausted and the allocations fail.
Fixing this means either having GFP_THISNODE wake up kswapd, or
GFP_THISNODE not participating in zone fairness at all. The latter
seems safer as an acute bugfix, we can clean up later.
Reported-by: Jan Stancek <jstancek@xxxxxxxxxx>
Signed-off-by: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: <stable@xxxxxxxxxx> # 3.12+
Acked-by: Rik van Riel <riel@xxxxxxxxxx>
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