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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: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2011-10-20 15:45:37 -04:00
parent dff51cd1c6
commit cd354ad613
1 changed files with 2 additions and 2 deletions
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4
fs/btrfs/tree-log.c
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@ -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);