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| author |   Chao Yu <chao2.yu@samsung.com> | 2014-05-08 17:00:35 +0800 |
|---|---|---|
| committer |   Jaegeuk Kim <jaegeuk.kim@samsung.com> | 2014-05-08 18:23:21 +0900 |
| commit | adf8d90b6a949dc80e827263fccb31f8eb08a55d (patch) | |
| tree | a7bc2e33fdd4ad08981c35b04ec94c0ee57093a8 /fs/f2fs | |
| parent | f2fs: add a tracepoint for f2fs_read_data_page (diff) | |
| download | linux-dev-adf8d90b6a949dc80e827263fccb31f8eb08a55d.tar.xz linux-dev-adf8d90b6a949dc80e827263fccb31f8eb08a55d.zip | |
f2fs: avoid to use slab memory in f2fs_issue_flush for efficiency
If we use slab memory in f2fs_issue_flush(), we will face memory pressure and
latency time caused by racing of kmem_cache_{alloc,free}.
Let's alloc memory in stack instead of slab.
Signed-off-by: Chao Yu <chao2.yu@samsung.com>
Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs')
| -rw-r--r-- | fs/f2fs/segment.c | 28 |
1 files changed, 9 insertions, 19 deletions
diff --git a/fs/f2fs/segment.c b/fs/f2fs/segment.c index 2ecbffb91f37..f25f0e07e26f 100644 --- a/fs/f2fs/segment.c +++ b/fs/f2fs/segment.c @@ -25,7 +25,6 @@ #define __reverse_ffz(x) __reverse_ffs(~(x)) static struct kmem_cache *discard_entry_slab; -static struct kmem_cache *flush_cmd_slab; /* * __reverse_ffs is copied from include/asm-generic/bitops/__ffs.h since @@ -238,30 +237,28 @@ repeat: int f2fs_issue_flush(struct f2fs_sb_info *sbi) { struct flush_cmd_control *fcc = SM_I(sbi)->cmd_control_info; - struct flush_cmd *cmd; - int ret; + struct flush_cmd cmd; if (!test_opt(sbi, FLUSH_MERGE)) return blkdev_issue_flush(sbi->sb->s_bdev, GFP_KERNEL, NULL); - cmd = f2fs_kmem_cache_alloc(flush_cmd_slab, GFP_ATOMIC | __GFP_ZERO); - init_completion(&cmd->wait); + init_completion(&cmd.wait); + cmd.next = NULL; spin_lock(&fcc->issue_lock); if (fcc->issue_list) - fcc->issue_tail->next = cmd; + fcc->issue_tail->next = &cmd; else - fcc->issue_list = cmd; - fcc->issue_tail = cmd; + fcc->issue_list = &cmd; + fcc->issue_tail = &cmd; spin_unlock(&fcc->issue_lock); if (!fcc->dispatch_list) wake_up(&fcc->flush_wait_queue); - wait_for_completion(&cmd->wait); - ret = cmd->ret; - kmem_cache_free(flush_cmd_slab, cmd); - return ret; + wait_for_completion(&cmd.wait); + + return cmd.ret; } int create_flush_cmd_control(struct f2fs_sb_info *sbi) @@ -2036,17 +2033,10 @@ int __init create_segment_manager_caches(void) sizeof(struct discard_entry)); if (!discard_entry_slab) return -ENOMEM; - flush_cmd_slab = f2fs_kmem_cache_create("flush_command", - sizeof(struct flush_cmd)); - if (!flush_cmd_slab) { - kmem_cache_destroy(discard_entry_slab); - return -ENOMEM; - } return 0; } void destroy_segment_manager_caches(void) { kmem_cache_destroy(discard_entry_slab); - kmem_cache_destroy(flush_cmd_slab); } |