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Subject[PATCH] make the page allocator aware of filesystem transactions
In XFS we have large pieces of code that might be called either from
inside a filesystem transaction or not. Currently we have added a
PF_FSTRANS process flag and fall back to GFP_NOFS when it's set.

I think it might be useful to generalize this at the page allocator
level and always clear __GFP_FS if the process flag is set.

Comments?


You can import this changeset into BK by piping this whole message to:
'| bk receive [path to repository]' or apply the patch as usual.

===================================================================


ChangeSet@1.509, 2002-08-23 22:01:27+02:00, hch@sb.bsdonline.org
VM: make the page allocator aware of filesystem transactions


include/linux/sched.h | 1 +
mm/vmscan.c | 3 +++
2 files changed, 4 insertions


diff -Nru a/include/linux/sched.h b/include/linux/sched.h
--- a/include/linux/sched.h Fri Aug 23 22:01:58 2002
+++ b/include/linux/sched.h Fri Aug 23 22:01:58 2002
@@ -400,6 +400,7 @@
#define PF_FREEZE 0x00010000 /* this task should be frozen for suspend */
#define PF_IOTHREAD 0x00020000 /* this thread is needed for doing I/O to swap */
#define PF_FROZEN 0x00040000 /* frozen for system suspend */
+#define PF_FSTRANS 0x00080000 /* inside a filesystem transaction */

/*
* Ptrace flags
diff -Nru a/mm/vmscan.c b/mm/vmscan.c
--- a/mm/vmscan.c Fri Aug 23 22:01:58 2002
+++ b/mm/vmscan.c Fri Aug 23 22:01:58 2002
@@ -458,6 +458,9 @@
int max_scan;
static atomic_t nr_to_refill = ATOMIC_INIT(0);

+ if (current->flags & PF_FSTRANS)
+ gfp_mask &= ~__GFP_FS;
+
if (kmem_cache_reap(gfp_mask) >= nr_pages)
return 0;

===================================================================

This BitKeeper patch contains the following changesets:
1.509
## Wrapped with gzip_uu ##


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end
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