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authorSteven Whitehouse <swhiteho@redhat.com>2012-03-08 12:10:23 +0000
committerSteven Whitehouse <swhiteho@redhat.com>2012-03-08 12:10:23 +0000
commit75ca61c101601a7071d93571920be9697b3fda9b (patch)
treeaaf42da2b6086a58d84efd4ef39a312f03cfbefb /fs/gfs2/lops.c
parent35e478f42271673f79066a1ed008c6604621c6fe (diff)
GFS2: Remove a __GFP_NOFAIL allocation
In order to ensure that we've got enough buffer heads for flushing the journal, the orignal code used __GFP_NOFAIL when performing this allocation. Here we dispense with that in favour of using a mempool. This should improve efficiency in low memory conditions since flushing the journal is a good way to get memory back, we don't want to be spinning, waiting on memory allocations. The buffers which are allocated via this mempool are fairly short lived, so that we'll recycle them pretty quickly. Although there are other memory allocations which occur during the journal flush process, this is the one which can potentially require the most memory, so the most important one to fix. The amount of memory reserved is a fixed amount, and we should not need to scale it when there are a greater number of filesystems in use. Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Diffstat (limited to 'fs/gfs2/lops.c')
-rw-r--r--fs/gfs2/lops.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/fs/gfs2/lops.c b/fs/gfs2/lops.c
index fe369bd9e10c..87e6e0d66bb7 100644
--- a/fs/gfs2/lops.c
+++ b/fs/gfs2/lops.c
@@ -12,6 +12,7 @@
#include <linux/spinlock.h>
#include <linux/completion.h>
#include <linux/buffer_head.h>
+#include <linux/mempool.h>
#include <linux/gfs2_ondisk.h>
#include <linux/bio.h>
#include <linux/fs.h>
@@ -199,7 +200,7 @@ static void gfs2_fake_write_endio(struct buffer_head *bh, int uptodate)
struct gfs2_sbd *sdp = bd->bd_gl->gl_sbd;
end_buffer_write_sync(bh, uptodate);
- free_buffer_head(bh);
+ mempool_free(bh, gfs2_bh_pool);
unlock_buffer(real_bh);
brelse(real_bh);
if (atomic_dec_and_test(&sdp->sd_log_in_flight))
@@ -220,7 +221,7 @@ static struct buffer_head *gfs2_log_fake_buf(struct gfs2_sbd *sdp,
u64 blkno = gfs2_log_bmap(sdp, sdp->sd_log_flush_head);
struct buffer_head *bh;
- bh = alloc_buffer_head(GFP_NOFS | __GFP_NOFAIL);
+ bh = mempool_alloc(gfs2_bh_pool, GFP_NOFS);
atomic_set(&bh->b_count, 1);
bh->b_state = (1 << BH_Mapped) | (1 << BH_Uptodate) | (1 << BH_Lock);
set_bh_page(bh, real->b_page, bh_offset(real));