tree f93fb812e31885956e23b6fe7839082e661b5119
parent a49335cceab8afb6603152fcc3f7d3b6677366ca
author Paul Jackson <[EMAIL PROTECTED]> Wed, 07 Sep 2005 05:18:10 -0700
committer Linus Torvalds <[EMAIL PROTECTED]> Thu, 08 Sep 2005 06:57:40 -0700

[PATCH] cpusets: new __GFP_HARDWALL flag

Add another GFP flag: __GFP_HARDWALL.

A subsequent "cpuset_zone_allowed" patch will use this flag to mark GFP_USER
allocations, and distinguish them from GFP_KERNEL allocations.

Allocations (such as GFP_USER) marked GFP_HARDWALL are constrainted to the
current tasks cpuset.  Other allocations (such as GFP_KERNEL) can steal from
the possibly larger nearest mem_exclusive cpuset ancestor, if memory is tight
on every node in the current cpuset.

This patch collides with Mel Gorman's patch to reduce fragmentation in the
standard buddy allocator, which adds two GFP flags.  This was discussed on
linux-mm in July.  Most likely, one of his flags for user reclaimable memory
can be the same as my __GFP_HARDWALL flag, under some generic name meaning its
user address space memory.

Signed-off-by: Paul Jackson <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
Signed-off-by: Linus Torvalds <[EMAIL PROTECTED]>

 include/linux/gfp.h |    8 +++++---
 1 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/include/linux/gfp.h b/include/linux/gfp.h
--- a/include/linux/gfp.h
+++ b/include/linux/gfp.h
@@ -40,6 +40,7 @@ struct vm_area_struct;
 #define __GFP_ZERO     0x8000u /* Return zeroed page on success */
 #define __GFP_NOMEMALLOC 0x10000u /* Don't use emergency reserves */
 #define __GFP_NORECLAIM  0x20000u /* No realy zone reclaim during allocation */
+#define __GFP_HARDWALL   0x40000u /* Enforce hardwall cpuset memory allocs */
 #define __GFP_BITS_SHIFT 20    /* Room for 20 __GFP_FOO bits */
 #define __GFP_BITS_MASK ((1 << __GFP_BITS_SHIFT) - 1)
@@ -48,14 +49,15 @@ struct vm_area_struct;
                        __GFP_COLD|__GFP_NOWARN|__GFP_REPEAT| \
                        __GFP_NOFAIL|__GFP_NORETRY|__GFP_NO_GROW|__GFP_COMP| \
-                       __GFP_NOMEMALLOC|__GFP_NORECLAIM)
+                       __GFP_NOMEMALLOC|__GFP_NORECLAIM|__GFP_HARDWALL)
 #define GFP_ATOMIC     (__GFP_HIGH)
 #define GFP_NOIO       (__GFP_WAIT)
 #define GFP_NOFS       (__GFP_WAIT | __GFP_IO)
 #define GFP_KERNEL     (__GFP_WAIT | __GFP_IO | __GFP_FS)
-#define GFP_USER       (__GFP_WAIT | __GFP_IO | __GFP_FS)
+#define GFP_USER       (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL)
+#define GFP_HIGHUSER   (__GFP_WAIT | __GFP_IO | __GFP_FS | __GFP_HARDWALL | \
+                        __GFP_HIGHMEM)
 /* Flag - indicates that the buffer will be suitable for DMA.  Ignored on some
    platforms, used as appropriate on others */
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