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xfs: add a shrinker to background inode reclaim

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On low memory boxes or those with highmem, kernel can OOM before the
background reclaims inodes via xfssyncd. Add a shrinker to run inode
reclaim so that it inode reclaim is expedited when memory is low.

This is more complex than it needs to be because the VM folk don't
want a context added to the shrinker infrastructure. Hence we need
to add a global list of XFS mount structures so the shrinker can
traverse them.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Dave Chinner
2010-04-29 09:55:50 +10:00
committed by Alex Elder
parent 79dba2eaa7
commit 9bf729c0af
6 changed files with 120 additions and 9 deletions
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5
fs/xfs/linux-2.6/xfs_super.c
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@@ -1209,6 +1209,7 @@ xfs_fs_put_super(
xfs_unmountfs(mp);
xfs_freesb(mp);
xfs_inode_shrinker_unregister(mp);
xfs_icsb_destroy_counters(mp);
xfs_close_devices(mp);
xfs_dmops_put(mp);
@@ -1622,6 +1623,8 @@ xfs_fs_fill_super(
if (error)
goto fail_vnrele;
xfs_inode_shrinker_register(mp);
kfree(mtpt);
return 0;
@@ -1867,6 +1870,7 @@ init_xfs_fs(void)
goto out_cleanup_procfs;
vfs_initquota();
xfs_inode_shrinker_init();
error = register_filesystem(&xfs_fs_type);
if (error)
@@ -1894,6 +1898,7 @@ exit_xfs_fs(void)
{
vfs_exitquota();
unregister_filesystem(&xfs_fs_type);
xfs_inode_shrinker_destroy();
xfs_sysctl_unregister();
xfs_cleanup_procfs();
xfs_buf_terminate();