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[PATCH 1/5] xfs: track AGs with reclaimable inodes in per-ag radix tree

To: xfs@xxxxxxxxxxx
Subject: [PATCH 1/5] xfs: track AGs with reclaimable inodes in per-ag radix tree
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Thu, 15 Jul 2010 10:38:16 +1000
In-reply-to: <1279154300-2018-1-git-send-email-david@xxxxxxxxxxxxx>
References: <1279154300-2018-1-git-send-email-david@xxxxxxxxxxxxx>
From: Dave Chinner <dchinner@xxxxxxxxxx>

https://bugzilla.kernel.org/show_bug.cgi?id=16348

When the filesystem grows to a large number of allocation groups,
the summing of recalimable inodes gets expensive. In many cases,
most AGs won't have any reclaimable inodes and so we are wasting CPU
time aggregating over these AGs. This is particularly important for
the inode shrinker that gets called frequently under memory
pressure.

To avoid the overhead, track AGs with reclaimable inodes in the
per-ag radix tree so that we can find all the AGs with reclaimable
inodes via a simple gang tag lookup. This involves setting the tag
when the first reclaimable inode is tracked in the AG, and removing
the tag when the last reclaimable inode is removed from the tree.
Then the summation process becomes a loop walking the radix tree
summing AGs with the reclaim tag set.

This significantly reduces the overhead of scanning - a 6400 AG
filesystea now only uses about 25% of a cpu in kswapd while slab reclaim
progresses instead of being permanently stuck at 100% CPU and making little
progress. Clean filesystems filesystems will see no overhead and the
overhead only increases linearly with the number of dirty AGs.

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
---
 fs/xfs/linux-2.6/xfs_sync.c  |   71 +++++++++++++++++++++++++++++++++++++----
 fs/xfs/linux-2.6/xfs_trace.h |    3 ++
 2 files changed, 67 insertions(+), 7 deletions(-)

diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index 56fed91..51da595 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -133,6 +133,41 @@ restart:
        return last_error;
 }
 
+/*
+ * Select the next per-ag structure to iterate during the walk. The reclaim
+ * walk is optimised only to walk AGs with reclaimable inodes in them.
+ */
+static struct xfs_perag *
+xfs_inode_ag_iter_next_pag(
+       struct xfs_mount        *mp,
+       xfs_agnumber_t          *first,
+       int                     tag)
+{
+       struct xfs_perag        *pag = NULL;
+
+       if (tag == XFS_ICI_RECLAIM_TAG) {
+               int found;
+               int ref;
+
+               spin_lock(&mp->m_perag_lock);
+               found = radix_tree_gang_lookup_tag(&mp->m_perag_tree,
+                               (void **)&pag, *first, 1, tag);
+               if (found <= 0) {
+                       spin_unlock(&mp->m_perag_lock);
+                       return NULL;
+               }
+               *first = pag->pag_agno + 1;
+               /* open coded pag reference increment */
+               ref = atomic_inc_return(&pag->pag_ref);
+               spin_unlock(&mp->m_perag_lock);
+               trace_xfs_perag_get_reclaim(mp, pag->pag_agno, ref, _RET_IP_);
+       } else {
+               pag = xfs_perag_get(mp, *first);
+               (*first)++;
+       }
+       return pag;
+}
+
 int
 xfs_inode_ag_iterator(
        struct xfs_mount        *mp,
@@ -143,16 +178,15 @@ xfs_inode_ag_iterator(
        int                     exclusive,
        int                     *nr_to_scan)
 {
+       struct xfs_perag        *pag;
        int                     error = 0;
        int                     last_error = 0;
        xfs_agnumber_t          ag;
        int                     nr;
 
        nr = nr_to_scan ? *nr_to_scan : INT_MAX;
-       for (ag = 0; ag < mp->m_sb.sb_agcount; ag++) {
-               struct xfs_perag        *pag;
-
-               pag = xfs_perag_get(mp, ag);
+       ag = 0;
+       while ((pag = xfs_inode_ag_iter_next_pag(mp, &ag, tag))) {
                error = xfs_inode_ag_walk(mp, pag, execute, flags, tag,
                                                exclusive, &nr);
                xfs_perag_put(pag);
@@ -628,6 +662,17 @@ __xfs_inode_set_reclaim_tag(
        radix_tree_tag_set(&pag->pag_ici_root,
                           XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),
                           XFS_ICI_RECLAIM_TAG);
+
+       if (!pag->pag_ici_reclaimable) {
+               /* propagate the reclaim tag up into the perag radix tree */
+               spin_lock(&ip->i_mount->m_perag_lock);
+               radix_tree_tag_set(&ip->i_mount->m_perag_tree,
+                               XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
+                               XFS_ICI_RECLAIM_TAG);
+               spin_unlock(&ip->i_mount->m_perag_lock);
+               trace_xfs_perag_set_reclaim(ip->i_mount, pag->pag_agno,
+                                                       -1, _RET_IP_);
+       }
        pag->pag_ici_reclaimable++;
 }
 
@@ -662,6 +707,16 @@ __xfs_inode_clear_reclaim_tag(
        radix_tree_tag_clear(&pag->pag_ici_root,
                        XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG);
        pag->pag_ici_reclaimable--;
+       if (!pag->pag_ici_reclaimable) {
+               /* clear the reclaim tag from the perag radix tree */
+               spin_lock(&ip->i_mount->m_perag_lock);
+               radix_tree_tag_clear(&ip->i_mount->m_perag_tree,
+                               XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
+                               XFS_ICI_RECLAIM_TAG);
+               spin_unlock(&ip->i_mount->m_perag_lock);
+               trace_xfs_perag_clear_reclaim(ip->i_mount, pag->pag_agno,
+                                                       -1, _RET_IP_);
+       }
 }
 
 /*
@@ -832,7 +887,7 @@ xfs_reclaim_inode_shrink(
        struct xfs_mount *mp;
        struct xfs_perag *pag;
        xfs_agnumber_t  ag;
-       int             reclaimable = 0;
+       int             reclaimable;
 
        if (nr_to_scan) {
                if (!(gfp_mask & __GFP_FS))
@@ -849,9 +904,11 @@ xfs_reclaim_inode_shrink(
        }
 
        down_read(&xfs_mount_list_lock);
+       reclaimable = 0;
        list_for_each_entry(mp, &xfs_mount_list, m_mplist) {
-               for (ag = 0; ag < mp->m_sb.sb_agcount; ag++) {
-                       pag = xfs_perag_get(mp, ag);
+               ag = 0;
+               while ((pag = xfs_inode_ag_iter_next_pag(mp, &ag,
+                                               XFS_ICI_RECLAIM_TAG))) {
                        reclaimable += pag->pag_ici_reclaimable;
                        xfs_perag_put(pag);
                }
diff --git a/fs/xfs/linux-2.6/xfs_trace.h b/fs/xfs/linux-2.6/xfs_trace.h
index d506753..24e5580 100644
--- a/fs/xfs/linux-2.6/xfs_trace.h
+++ b/fs/xfs/linux-2.6/xfs_trace.h
@@ -124,7 +124,10 @@ DEFINE_EVENT(xfs_perag_class, name,        \
                 unsigned long caller_ip),                                      
\
        TP_ARGS(mp, agno, refcount, caller_ip))
 DEFINE_PERAG_REF_EVENT(xfs_perag_get);
+DEFINE_PERAG_REF_EVENT(xfs_perag_get_reclaim);
 DEFINE_PERAG_REF_EVENT(xfs_perag_put);
+DEFINE_PERAG_REF_EVENT(xfs_perag_set_reclaim);
+DEFINE_PERAG_REF_EVENT(xfs_perag_clear_reclaim);
 
 TRACE_EVENT(xfs_attr_list_node_descend,
        TP_PROTO(struct xfs_attr_list_context *ctx,
-- 
1.7.1

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