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authorZhang Yi <yi.zhang@huawei.com>2023-11-29 19:47:40 +0800
committerTheodore Ts'o <tytso@mit.edu>2023-11-30 23:27:39 -0500
commit6a3afb6ac6dfab158ebdd4b87941178f58c8939f (patch)
treefbbbf93a03dc5f3fb08947e8060dbe1aa0c5f334 /include/linux/jbd2.h
parent85559227211020b270728104c3b89918f7af27ac (diff)
jbd2: increase the journal IO's priority
Current jbd2 only add REQ_SYNC for descriptor block, metadata log buffer, commit buffer and superblock buffer, the submitted IO could be throttled by writeback throttle in block layer, that could lead to priority inversion in some cases. The log IO looks like a kind of high priority metadata IO, so it should not be throttled by WBT like QOS policies in block layer, let's add REQ_SYNC | REQ_IDLE to exempt from writeback throttle, and also add REQ_META together indicates it's a metadata IO. Signed-off-by: Zhang Yi <yi.zhang@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Link: https://lore.kernel.org/r/20231129114740.2686201-2-yi.zhang@huaweicloud.com Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Diffstat (limited to 'include/linux/jbd2.h')
-rw-r--r--include/linux/jbd2.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/jbd2.h b/include/linux/jbd2.h
index 6dcbb4eb80fb..beb30719ee16 100644
--- a/include/linux/jbd2.h
+++ b/include/linux/jbd2.h
@@ -1374,6 +1374,9 @@ JBD2_FEATURE_INCOMPAT_FUNCS(csum2, CSUM_V2)
JBD2_FEATURE_INCOMPAT_FUNCS(csum3, CSUM_V3)
JBD2_FEATURE_INCOMPAT_FUNCS(fast_commit, FAST_COMMIT)
+/* Journal high priority write IO operation flags */
+#define JBD2_JOURNAL_REQ_FLAGS (REQ_META | REQ_SYNC | REQ_IDLE)
+
/*
* Journal flag definitions
*/