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authorDave Chinner <dchinner@redhat.com>2011-09-30 04:45:02 +0000
committerAlex Elder <aelder@sgi.com>2011-10-11 21:15:08 -0500
commit3815832a2aa4df9815d15dac05227e0c8551833f (patch)
treef92c98e6e73d3d8e6da7909b1ebd8e7cf4888df9 /fs/xfs/xfs_buf.c
parentddc3415aba1cb2f86d1fcad720cea834ee178f54 (diff)
xfs: Don't allocate new buffers on every call to _xfs_buf_find
Stats show that for an 8-way unlink @ ~80,000 unlinks/s we are doing ~1 million cache hit lookups to ~3000 buffer creates. That's almost 3 orders of magnitude more cahce hits than misses, so optimising for cache hits is quite important. In the cache hit case, we do not need to allocate a new buffer in case of a cache miss, so we are effectively hitting the allocator for no good reason for vast the majority of calls to _xfs_buf_find. 8-way create workloads are showing similar cache hit/miss ratios. The result is profiles that look like this: samples pcnt function DSO _______ _____ _______________________________ _________________ 1036.00 10.0% _xfs_buf_find [kernel.kallsyms] 582.00 5.6% kmem_cache_alloc [kernel.kallsyms] 519.00 5.0% __memcpy [kernel.kallsyms] 468.00 4.5% __ticket_spin_lock [kernel.kallsyms] 388.00 3.7% kmem_cache_free [kernel.kallsyms] 331.00 3.2% xfs_log_commit_cil [kernel.kallsyms] Further, there is a fair bit of work involved in initialising a new buffer once a cache miss has occurred and we currently do that under the rbtree spinlock. That increases spinlock hold time on what are heavily used trees. To fix this, remove the initialisation of the buffer from _xfs_buf_find() and only allocate the new buffer once we've had a cache miss. Initialise the buffer immediately after allocating it in xfs_buf_get, too, so that is it ready for insert if we get another cache miss after allocation. This minimises lock hold time and avoids unnecessary allocator churn. The resulting profiles look like: samples pcnt function DSO _______ _____ ___________________________ _________________ 8111.00 9.1% _xfs_buf_find [kernel.kallsyms] 4380.00 4.9% __memcpy [kernel.kallsyms] 4341.00 4.8% __ticket_spin_lock [kernel.kallsyms] 3401.00 3.8% kmem_cache_alloc [kernel.kallsyms] 2856.00 3.2% xfs_log_commit_cil [kernel.kallsyms] 2625.00 2.9% __kmalloc [kernel.kallsyms] 2380.00 2.7% kfree [kernel.kallsyms] 2016.00 2.3% kmem_cache_free [kernel.kallsyms] Showing a significant reduction in time spent doing allocation and freeing from slabs (kmem_cache_alloc and kmem_cache_free). Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Alex Elder <aelder@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_buf.c')
-rw-r--r--fs/xfs/xfs_buf.c48
1 files changed, 28 insertions, 20 deletions
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index e3af85095dd..6785b7bd952 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -477,8 +477,6 @@ _xfs_buf_find(
/* No match found */
if (new_bp) {
- _xfs_buf_initialize(new_bp, btp, range_base,
- range_length, flags);
rb_link_node(&new_bp->b_rbnode, parent, rbp);
rb_insert_color(&new_bp->b_rbnode, &pag->pag_buf_tree);
/* the buffer keeps the perag reference until it is freed */
@@ -521,35 +519,53 @@ found:
}
/*
- * Assembles a buffer covering the specified range.
- * Storage in memory for all portions of the buffer will be allocated,
- * although backing storage may not be.
+ * Assembles a buffer covering the specified range. The code is optimised for
+ * cache hits, as metadata intensive workloads will see 3 orders of magnitude
+ * more hits than misses.
*/
-xfs_buf_t *
+struct xfs_buf *
xfs_buf_get(
xfs_buftarg_t *target,/* target for buffer */
xfs_off_t ioff, /* starting offset of range */
size_t isize, /* length of range */
xfs_buf_flags_t flags)
{
- xfs_buf_t *bp, *new_bp;
+ struct xfs_buf *bp;
+ struct xfs_buf *new_bp;
int error = 0;
+ bp = _xfs_buf_find(target, ioff, isize, flags, NULL);
+ if (likely(bp))
+ goto found;
+
new_bp = xfs_buf_allocate(flags);
if (unlikely(!new_bp))
return NULL;
+ _xfs_buf_initialize(new_bp, target,
+ ioff << BBSHIFT, isize << BBSHIFT, flags);
+
bp = _xfs_buf_find(target, ioff, isize, flags, new_bp);
+ if (!bp) {
+ xfs_buf_deallocate(new_bp);
+ return NULL;
+ }
+
if (bp == new_bp) {
error = xfs_buf_allocate_memory(bp, flags);
if (error)
goto no_buffer;
- } else {
+ } else
xfs_buf_deallocate(new_bp);
- if (unlikely(bp == NULL))
- return NULL;
- }
+ /*
+ * Now we have a workable buffer, fill in the block number so
+ * that we can do IO on it.
+ */
+ bp->b_bn = ioff;
+ bp->b_count_desired = bp->b_buffer_length;
+
+found:
if (!(bp->b_flags & XBF_MAPPED)) {
error = _xfs_buf_map_pages(bp, flags);
if (unlikely(error)) {
@@ -560,18 +576,10 @@ xfs_buf_get(
}
XFS_STATS_INC(xb_get);
-
- /*
- * Always fill in the block number now, the mapped cases can do
- * their own overlay of this later.
- */
- bp->b_bn = ioff;
- bp->b_count_desired = bp->b_buffer_length;
-
trace_xfs_buf_get(bp, flags, _RET_IP_);
return bp;
- no_buffer:
+no_buffer:
if (flags & (XBF_LOCK | XBF_TRYLOCK))
xfs_buf_unlock(bp);
xfs_buf_rele(bp);