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Commit cd354ad6 authored by Chris Mason's avatar Chris Mason
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Btrfs: don't wait as long for more batches during SSD log commit 



When we're doing log commits, we try to wait for more writers to come in
and make the commit bigger.  This helps improve performance on rotating
disks, but on SSDs it adds latencies.

Signed-off-by: default avatarChris Mason <chris.mason@oracle.com>
parent dff51cd1

fs/btrfs/tree-log.c

+2 −2
Original line number Diff line number Diff line
@@ -2013,10 +2013,10 @@ int btrfs_sync_log(struct btrfs_trans_handle *trans, 
	/* wait for previous tree log sync to complete */

	if (atomic_read(&root->log_commit[(index1 + 1) % 2]))

		wait_log_commit(trans, root, root->log_transid - 1);



	while (1) {

		unsigned long batch = root->log_batch;

		if (root->log_multiple_pids) {

		/* when we're on an ssd, just kick the log commit out */

		if (!btrfs_test_opt(root, SSD) && root->log_multiple_pids) {

			mutex_unlock(&root->log_mutex);

			schedule_timeout_uninterruptible(1);

			mutex_lock(&root->log_mutex);