From: Christoph Lameter <clameter@engr.sgi.com>
Date: Wed, 15 Mar 2006 03:50:19 +0000 (-0800)
Subject: [PATCH] page migration: fail if page is in a vma flagged VM_LOCKED
X-Git-Tag: v2.6.16~30
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=4983da07f1e2e8dc81cb9d640fbf35b899cdbdf2;p=pandora-kernel.git

[PATCH] page migration: fail if page is in a vma flagged VM_LOCKED

page migration currently simply retries a couple of times if try_to_unmap()
fails without inspecting the return code.

However, SWAP_FAIL indicates that the page is in a vma that has the
VM_LOCKED flag set (if ignore_refs ==1).  We can check for that return code
and avoid retrying the migration.

migrate_page_remove_references() now needs to return a reason why the
failure occured.  So switch migrate_page_remove_references to use -Exx
style error messages.

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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