xfs: Increase the default size of the reserved blocks pool
The current default size of the reserved blocks pool is easy to deplete with certain workloads, in particular workloads that do lots of concurrent delayed allocation extent conversions. If enough transactions are running in parallel and the entire pool is consumed then subsequent calls to xfs_trans_reserve() will fail with ENOSPC. Also add a rate limited warning so we know if this starts happening again. This is an updated version of an old patch from Lachlan McIlroy. Signed-off-by: Dave Chinner <david@fromorbit.com> Signed-off-by: Alex Elder <aelder@sgi.com>
This commit is contained in:
parent
3ed3a4343b
commit
8babd8a2e7
|
@ -1097,13 +1097,15 @@ xfs_default_resblks(xfs_mount_t *mp)
|
|||
__uint64_t resblks;
|
||||
|
||||
/*
|
||||
* We default to 5% or 1024 fsbs of space reserved, whichever is smaller.
|
||||
* This may drive us straight to ENOSPC on mount, but that implies
|
||||
* we were already there on the last unmount. Warn if this occurs.
|
||||
* We default to 5% or 8192 fsbs of space reserved, whichever is
|
||||
* smaller. This is intended to cover concurrent allocation
|
||||
* transactions when we initially hit enospc. These each require a 4
|
||||
* block reservation. Hence by default we cover roughly 2000 concurrent
|
||||
* allocation reservations.
|
||||
*/
|
||||
resblks = mp->m_sb.sb_dblocks;
|
||||
do_div(resblks, 20);
|
||||
resblks = min_t(__uint64_t, resblks, 1024);
|
||||
resblks = min_t(__uint64_t, resblks, 8192);
|
||||
return resblks;
|
||||
}
|
||||
|
||||
|
@ -1417,6 +1419,9 @@ xfs_mountfs(
|
|||
* when at ENOSPC. This is needed for operations like create with
|
||||
* attr, unwritten extent conversion at ENOSPC, etc. Data allocations
|
||||
* are not allowed to use this reserved space.
|
||||
*
|
||||
* This may drive us straight to ENOSPC on mount, but that implies
|
||||
* we were already there on the last unmount. Warn if this occurs.
|
||||
*/
|
||||
if (!(mp->m_flags & XFS_MOUNT_RDONLY)) {
|
||||
resblks = xfs_default_resblks(mp);
|
||||
|
@ -1725,26 +1730,30 @@ xfs_mod_incore_sb_unlocked(
|
|||
lcounter += rem;
|
||||
}
|
||||
} else { /* Taking blocks away */
|
||||
|
||||
lcounter += delta;
|
||||
|
||||
/*
|
||||
* If were out of blocks, use any available reserved blocks if
|
||||
* were allowed to.
|
||||
*/
|
||||
|
||||
if (lcounter < 0) {
|
||||
if (rsvd) {
|
||||
lcounter = (long long)mp->m_resblks_avail + delta;
|
||||
if (lcounter < 0) {
|
||||
return XFS_ERROR(ENOSPC);
|
||||
}
|
||||
mp->m_resblks_avail = lcounter;
|
||||
return 0;
|
||||
} else { /* not reserved */
|
||||
return XFS_ERROR(ENOSPC);
|
||||
}
|
||||
if (lcounter >= 0) {
|
||||
mp->m_sb.sb_fdblocks = lcounter +
|
||||
XFS_ALLOC_SET_ASIDE(mp);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* We are out of blocks, use any available reserved
|
||||
* blocks if were allowed to.
|
||||
*/
|
||||
if (!rsvd)
|
||||
return XFS_ERROR(ENOSPC);
|
||||
|
||||
lcounter = (long long)mp->m_resblks_avail + delta;
|
||||
if (lcounter >= 0) {
|
||||
mp->m_resblks_avail = lcounter;
|
||||
return 0;
|
||||
}
|
||||
printk_once(KERN_WARNING
|
||||
"Filesystem \"%s\": reserve blocks depleted! "
|
||||
"Consider increasing reserve pool size.",
|
||||
mp->m_fsname);
|
||||
return XFS_ERROR(ENOSPC);
|
||||
}
|
||||
|
||||
mp->m_sb.sb_fdblocks = lcounter + XFS_ALLOC_SET_ASIDE(mp);
|
||||
|
|
Loading…
Reference in a new issue