[PATCH] mm: fix __alloc_pages cpuset ALLOC_* flags

Two changes to the setting of the ALLOC_CPUSET flag in
mm/page_alloc.c:__alloc_pages()

- A bug fix - the "ignoring mins" case should not be honoring ALLOC_CPUSET.
  This case of all cases, since it is handling a request that will free up
  more memory than is asked for (exiting tasks, e.g.) should be allowed to
  escape cpuset constraints when memory is tight.

- A logic change to make it simpler.  Honor cpusets even on GFP_ATOMIC
  (!wait) requests.  With this, cpuset confinement applies to all requests
  except ALLOC_NO_WATERMARKS, so that in a subsequent cleanup patch, I can
  remove the ALLOC_CPUSET flag entirely.  Since I don't know any real reason
  this logic has to be either way, I am choosing the path of the simplest
  code.

Signed-off-by: Paul Jackson <pj@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index fe14a8c..1e49dc7 100644 (file)
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -903,8 +903,7 @@ restart:
                alloc_flags |= ALLOC_HARDER;
        if (gfp_mask & __GFP_HIGH)
                alloc_flags |= ALLOC_HIGH;
-       if (wait)
-               alloc_flags |= ALLOC_CPUSET;
+       alloc_flags |= ALLOC_CPUSET;
 
        /*
         * Go through the zonelist again. Let __GFP_HIGH and allocations
@@ -926,7 +925,7 @@ restart:
 nofail_alloc:
                        /* go through the zonelist yet again, ignoring mins */
                        page = get_page_from_freelist(gfp_mask, order,
-                               zonelist, ALLOC_NO_WATERMARKS|ALLOC_CPUSET);
+                               zonelist, ALLOC_NO_WATERMARKS);
                        if (page)
                                goto got_pg;
                        if (gfp_mask & __GFP_NOFAIL) {