mm: numa: Sanitize task_numa_fault() callsites
authorMel Gorman <mgorman@suse.de>
Mon, 7 Oct 2013 10:28:45 +0000 (11:28 +0100)
committerIngo Molnar <mingo@kernel.org>
Tue, 29 Oct 2013 10:37:52 +0000 (11:37 +0100)
commitc61109e34f60f6e85bb43c5a1cd51c0e3db40847
tree5b03f4c2d1376166da7e4a507ddf7a4c6e16eee7
parent587fe586f44a48f9691001ba6c45b86c8e4ba21f
mm: numa: Sanitize task_numa_fault() callsites

There are three callers of task_numa_fault():

 - do_huge_pmd_numa_page():
     Accounts against the current node, not the node where the
     page resides, unless we migrated, in which case it accounts
     against the node we migrated to.

 - do_numa_page():
     Accounts against the current node, not the node where the
     page resides, unless we migrated, in which case it accounts
     against the node we migrated to.

 - do_pmd_numa_page():
     Accounts not at all when the page isn't migrated, otherwise
     accounts against the node we migrated towards.

This seems wrong to me; all three sites should have the same
sementaics, furthermore we should accounts against where the page
really is, we already know where the task is.

So modify all three sites to always account; we did after all receive
the fault; and always account to where the page is after migration,
regardless of success.

They all still differ on when they clear the PTE/PMD; ideally that
would get sorted too.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: <stable@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1381141781-10992-8-git-send-email-mgorman@suse.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
mm/huge_memory.c
mm/memory.c