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xfs: reduce the number of pagb_lock roundtrips in xfs_alloc_clear_busy

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Instead of finding the per-ag and then taking and releasing the pagb_lock
for every single busy extent completed sort the list of busy extents and
only switch betweens AGs where nessecary.  This becomes especially important
with the online discard support which will hit this lock more often.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
Christoph Hellwig
2011-04-24 19:06:17 +00:00
committed by Alex Elder
parent 97d3ac75e5
commit 8a072a4d4c
6 changed files with 61 additions and 19 deletions
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5
fs/xfs/xfs_log_cil.c
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@@ -361,13 +361,12 @@ xlog_cil_committed(
int abort)
{
struct xfs_cil_ctx *ctx = args;
struct xfs_busy_extent *busyp, *n;
xfs_trans_committed_bulk(ctx->cil->xc_log->l_ailp, ctx->lv_chain,
ctx->start_lsn, abort);
list_for_each_entry_safe(busyp, n, &ctx->busy_extents, list)
xfs_alloc_busy_clear(ctx->cil->xc_log->l_mp, busyp);
xfs_alloc_busy_sort(&ctx->busy_extents);
xfs_alloc_busy_clear(ctx->cil->xc_log->l_mp, &ctx->busy_extents);
spin_lock(&ctx->cil->xc_cil_lock);
list_del(&ctx->committing);