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xfs: allow multiple reclaimers per AG

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Inode reclaim will still throttle direct reclaim on the per-ag
reclaim locks. This is no longer necessary as reclaim can run
non-blocking now. Hence we can remove these locks so that we don't
arbitrarily block reclaimers just because there are more direct
reclaimers than there are AGs.

This can result in multiple reclaimers working on the same range of
an AG, but this doesn't cause any apparent issues. Optimising the
spread of concurrent reclaimers for best efficiency can be done in a
future patchset.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Dave Chinner
2020-06-29 14:49:16 -07:00
committed by Darrick J. Wong
parent 617825fe34
commit 0e8e2c6343
3 changed files with 12 additions and 24 deletions
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4
fs/xfs/xfs_mount.c
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@@ -148,7 +148,6 @@ xfs_free_perag(
ASSERT(atomic_read(&pag->pag_ref) == 0);
xfs_iunlink_destroy(pag);
xfs_buf_hash_destroy(pag);
mutex_destroy(&pag->pag_ici_reclaim_lock);
call_rcu(&pag->rcu_head, __xfs_free_perag);
}
}
@@ -200,7 +199,6 @@ xfs_initialize_perag(
pag->pag_agno = index;
pag->pag_mount = mp;
spin_lock_init(&pag->pag_ici_lock);
mutex_init(&pag->pag_ici_reclaim_lock);
INIT_RADIX_TREE(&pag->pag_ici_root, GFP_ATOMIC);
if (xfs_buf_hash_init(pag))
goto out_free_pag;
@@ -242,7 +240,6 @@ xfs_initialize_perag(
out_hash_destroy:
xfs_buf_hash_destroy(pag);
out_free_pag:
mutex_destroy(&pag->pag_ici_reclaim_lock);
kmem_free(pag);
out_unwind_new_pags:
/* unwind any prior newly initialized pags */
@@ -252,7 +249,6 @@ out_unwind_new_pags:
break;
xfs_buf_hash_destroy(pag);
xfs_iunlink_destroy(pag);
mutex_destroy(&pag->pag_ici_reclaim_lock);
kmem_free(pag);
}
return error;