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authorLiu Bo <liubo2009@cn.fujitsu.com>2012-07-21 05:43:09 +0200
committerChris Mason <chris.mason@fusionio.com>2012-07-23 22:28:10 +0200
commit67c9684f48ea9cbc5e9b8a1feb3151800e9dcc22 (patch)
tree737434c4bc4654ea00b284c383f0acd60ddec725 /fs/btrfs
parentBtrfs: make btrfs's allocation smoothly with preallocation (diff)
downloadlinux-67c9684f48ea9cbc5e9b8a1feb3151800e9dcc22.tar.xz
linux-67c9684f48ea9cbc5e9b8a1feb3151800e9dcc22.zip
Btrfs: improve multi-thread buffer read
While testing with my buffer read fio jobs[1], I find that btrfs does not perform well enough. Here is a scenario in fio jobs: We have 4 threads, "t1 t2 t3 t4", starting to buffer read a same file, and all of them will race on add_to_page_cache_lru(), and if one thread successfully puts its page into the page cache, it takes the responsibility to read the page's data. And what's more, reading a page needs a period of time to finish, in which other threads can slide in and process rest pages: t1 t2 t3 t4 add Page1 read Page1 add Page2 | read Page2 add Page3 | | read Page3 add Page4 | | | read Page4 -----|------------|-----------|-----------|-------- v v v v bio bio bio bio Now we have four bios, each of which holds only one page since we need to maintain consecutive pages in bio. Thus, we can end up with far more bios than we need. Here we're going to a) delay the real read-page section and b) try to put more pages into page cache. With that said, we can make each bio hold more pages and reduce the number of bios we need. Here is some numbers taken from fio results: w/o patch w patch ------------- -------- --------------- READ: 745MB/s +25% 934MB/s [1]: [global] group_reporting thread numjobs=4 bs=32k rw=read ioengine=sync directory=/mnt/btrfs/ [READ] filename=foobar size=2000M invalidate=1 Signed-off-by: Liu Bo <liubo2009@cn.fujitsu.com> Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Diffstat (limited to '')
-rw-r--r--fs/btrfs/extent_io.c29
1 files changed, 24 insertions, 5 deletions
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 97efc2f22597..3e7c9ed6505b 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -3566,19 +3566,38 @@ int extent_readpages(struct extent_io_tree *tree,
struct bio *bio = NULL;
unsigned page_idx;
unsigned long bio_flags = 0;
+ struct page *pagepool[16];
+ struct page *page;
+ int i = 0;
+ int nr = 0;
for (page_idx = 0; page_idx < nr_pages; page_idx++) {
- struct page *page = list_entry(pages->prev, struct page, lru);
+ page = list_entry(pages->prev, struct page, lru);
prefetchw(&page->flags);
list_del(&page->lru);
- if (!add_to_page_cache_lru(page, mapping,
+ if (add_to_page_cache_lru(page, mapping,
page->index, GFP_NOFS)) {
- __extent_read_full_page(tree, page, get_extent,
- &bio, 0, &bio_flags);
+ page_cache_release(page);
+ continue;
}
- page_cache_release(page);
+
+ pagepool[nr++] = page;
+ if (nr < ARRAY_SIZE(pagepool))
+ continue;
+ for (i = 0; i < nr; i++) {
+ __extent_read_full_page(tree, pagepool[i], get_extent,
+ &bio, 0, &bio_flags);
+ page_cache_release(pagepool[i]);
+ }
+ nr = 0;
}
+ for (i = 0; i < nr; i++) {
+ __extent_read_full_page(tree, pagepool[i], get_extent,
+ &bio, 0, &bio_flags);
+ page_cache_release(pagepool[i]);
+ }
+
BUG_ON(!list_empty(pages));
if (bio)
return submit_one_bio(READ, bio, 0, bio_flags);