The patch titled
Subject: mm/truncate: avoid pointless cleancache_invalidate_inode() calls.
has been added to the -mm tree. Its filename is
mm-truncate-avoid-pointless-cleancache_invalidate_inode-calls.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-truncate-avoid-pointless-cleancache_invalidate_inode-calls.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-truncate-avoid-pointless-cleancache_invalidate_inode-calls.patch
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------------------------------------------------------
From: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Subject: mm/truncate: avoid pointless cleancache_invalidate_inode() calls.
cleancache_invalidate_inode() called truncate_inode_pages_range()
and invalidate_inode_pages2_range() twice - on entry and on exit.
It's stupid and waste of time. It's enough to call it once at
exit.
Link: http://lkml.kernel.org/r/20170424164135.22350-5-aryabinin@xxxxxxxxxxxxx
Signed-off-by: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Acked-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
Cc: Alexander Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx
Cc: Ross Zwisler <ross.zwisler@xxxxxxxxxxxxxxx>
Cc: Jens Axboe <axboe@xxxxxxxxx>
Cc: Johannes Weiner <hannes@xxxxxxxxxxx>
Cc: Alexey Kuznetsov <kuznet@xxxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Nikolay Borisov <n.borisov.lkml@xxxxxxxxx
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/truncate.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff -puN mm/truncate.c~mm-truncate-avoid-pointless-cleancache_invalidate_inode-calls mm/truncate.c
--- a/mm/truncate.c~mm-truncate-avoid-pointless-cleancache_invalidate_inode-calls
+++ a/mm/truncate.c
@@ -266,9 +266,8 @@ void truncate_inode_pages_range(struct a
pgoff_t index;
int i;
- cleancache_invalidate_inode(mapping);
if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
- return;
+ goto out;
/* Offsets within partial pages */
partial_start = lstart & (PAGE_SIZE - 1);
@@ -363,7 +362,7 @@ void truncate_inode_pages_range(struct a
* will be released, just zeroed, so we can bail out now.
*/
if (start >= end)
- return;
+ goto out;
index = start;
for ( ; ; ) {
@@ -410,6 +409,8 @@ void truncate_inode_pages_range(struct a
pagevec_release(&pvec);
index++;
}
+
+out:
cleancache_invalidate_inode(mapping);
}
EXPORT_SYMBOL(truncate_inode_pages_range);
@@ -623,9 +624,8 @@ int invalidate_inode_pages2_range(struct
int ret2 = 0;
int did_range_unmap = 0;
- cleancache_invalidate_inode(mapping);
if (mapping->nrpages == 0 && mapping->nrexceptional == 0)
- return 0;
+ goto out;
pagevec_init(&pvec, 0);
index = start;
@@ -689,6 +689,8 @@ int invalidate_inode_pages2_range(struct
cond_resched();
index++;
}
+
+out:
cleancache_invalidate_inode(mapping);
return ret;
}
_
Patches currently in -mm which might be from aryabinin@xxxxxxxxxxxxx are
fs-fix-data-invalidation-in-the-cleancache-during-direct-io.patch
fs-block_dev-always-invalidate-cleancache-in-invalidate_bdev.patch
mm-truncate-bail-out-early-from-invalidate_inode_pages2_range-if-mapping-is-empty.patch
mm-truncate-avoid-pointless-cleancache_invalidate_inode-calls.patch
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