From: Dave Chinner <david@fromorbit.com>
To: "Darrick J. Wong" <djwong@kernel.org>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH 1/1] xfs: fix severe performance problems when fstrimming a subset of an AG
Date: Sun, 31 Mar 2024 08:51:23 +1100 [thread overview]
Message-ID: <ZgiJWxVcVwag0fIP@dread.disaster.area> (raw)
In-Reply-To: <20240329225149.GR6390@frogsfrogsfrogs>
On Fri, Mar 29, 2024 at 03:51:49PM -0700, Darrick J. Wong wrote:
> On Thu, Mar 28, 2024 at 09:15:25AM +1100, Dave Chinner wrote:
> > On Tue, Mar 26, 2024 at 07:07:58PM -0700, Darrick J. Wong wrote:
> > > From: Darrick J. Wong <djwong@kernel.org>
....
> > I think a commit message update is necessary. :)
>
> xfs: fix performance problems when fstrimming a subset of a fragmented AG
>
> On a 10TB filesystem where the free space in each AG is heavily
> fragmented, I noticed some very high runtimes on a FITRIM call for the
> entire filesystem. xfs_scrub likes to report progress information on
> each phase of the scrub, which means that a strace for the entire
> filesystem:
>
> ioctl(3, FITRIM, {start=0x0, len=10995116277760, minlen=0}) = 0 <686.209839>
>
> shows that scrub is uncommunicative for the entire duration. Reducing
> the size of the FITRIM requests to a single AG at a time produces lower
> times for each individual call, but even this isn't quite acceptable,
> because the time between progress reports are still very high:
>
> Strace for the first 4x 1TB AGs looks like (2):
> ioctl(3, FITRIM, {start=0x0, len=1099511627776, minlen=0}) = 0 <68.352033>
> ioctl(3, FITRIM, {start=0x10000000000, len=1099511627776, minlen=0}) = 0 <68.760323>
> ioctl(3, FITRIM, {start=0x20000000000, len=1099511627776, minlen=0}) = 0 <67.235226>
> ioctl(3, FITRIM, {start=0x30000000000, len=1099511627776, minlen=0}) = 0 <69.465744>
>
> I then had the idea to limit the length parameter of each call to a
> smallish amount (~11GB) so that we could report progress relatively
> quickly, but much to my surprise, each FITRIM call still took ~68
> seconds!
>
> Unfortunately, the by-length fstrim implementation handles this poorly
> because it walks the entire free space by length index (cntbt), which is
> a very inefficient way to walk a subset of the blocks of an AG.
>
> Therefore, create a second implementation that will walk the bnobt and
> perform the trims in block number order. This implementation avoids the
> worst problems of the original code, though it lacks the desirable
> attribute of freeing the biggest chunks first.
>
> On the other hand, this second implementation will be much easier to
> constrain the system call latency, and makes it much easier to report
> fstrim progress to anyone who's running xfs_scrub.
Much better :)
> > Here's a completely untested, uncompiled version of this by-bno
> > search I just wrote up to demonstrate that if we pass ag-confined
> > agbnos from the top level, we don't need to duplicate this gather
> > code at all or do trim range constraining inside the gather
> > functions...
>
> Mostly looks ok, but let's dig in--
>
> > -Dave.
> >
> > diff --git a/fs/xfs/xfs_discard.c b/fs/xfs/xfs_discard.c
> > index 268bb734dc0a..0c949dfc097a 100644
> > --- a/fs/xfs/xfs_discard.c
> > +++ b/fs/xfs/xfs_discard.c
> > @@ -145,14 +145,18 @@ xfs_discard_extents(
> > return error;
> > }
> >
> > +struct xfs_trim_cur {
> > + xfs_agblock_t start;
> > + xfs_extlen_t count;
> > + xfs_agblock_t end;
> > + xfs_extlen_t minlen;
> > + bool by_len;
> > +};
> >
> > static int
> > xfs_trim_gather_extents(
> > struct xfs_perag *pag,
> > - xfs_daddr_t start,
> > - xfs_daddr_t end,
> > - xfs_daddr_t minlen,
> > - struct xfs_alloc_rec_incore *tcur,
> > + struct xfs_trim_cur *tcur,
> > struct xfs_busy_extents *extents,
> > uint64_t *blocks_trimmed)
> > {
> > @@ -179,21 +183,21 @@ xfs_trim_gather_extents(
> > if (error)
> > goto out_trans_cancel;
> >
> > - cur = xfs_cntbt_init_cursor(mp, tp, agbp, pag);
> >
> > - /*
> > - * Look up the extent length requested in the AGF and start with it.
> > - */
> > - if (tcur->ar_startblock == NULLAGBLOCK)
> > - error = xfs_alloc_lookup_ge(cur, 0, tcur->ar_blockcount, &i);
> > - else
> > + if (tcur->by_len) {
> > + cur = xfs_bnobt_init_cursor(mp, tp, agbp, pag);
>
> I'm confused, why are we searching the by-bno btree if "by_len" is set?
Because I changed the logic half way through writing it and forgot
to change the variable name....
> Granted the logic for setting by_len triggers only for FITRIMs of
> subsets of an AG so this functions conrrectly...
>
> > + error = xfs_alloc_lookup_ge(cur, tcur->ar_startblock,
> > + 0, &i);
>
> ...insofar as this skips a free extent that starts before and ends after
> tcur->start.
Right - did I mention this wasn't even compiled? :)
>
> > + } else {
> > + cur = xfs_cntbt_init_cursor(mp, tp, agbp, pag);
> > error = xfs_alloc_lookup_le(cur, tcur->ar_startblock,
> > tcur->ar_blockcount, &i);
> > + }
>
> How about this initialization logic:
>
> if (tcur->by_bno) {
> /* sub-AG discard request always starts at tcur->start */
> cur = xfs_bnobt_init_cursor(mp, tp, agbp, pag);
> error = xfs_alloc_lookup_le(cur, tcur->start, 0, &i);
OK.
> } else if (tcur->start == NULLAGBLOCK) {
> /* first time through a by-len starts with max length */
> cur = xfs_cntbt_init_cursor(mp, tp, agbp, pag);
> error = xfs_alloc_lookup_ge(cur, 0, tcur->count, &i);
> } else {
> /* nth time through a by-len starts where we left off */
> cur = xfs_cntbt_init_cursor(mp, tp, agbp, pag);
> error = xfs_alloc_lookup_le(cur, tcur->start, tcur->count, &i);
> }
... but that is what I was explicilty trying to avoid because the
initial search on a by-count config is for tcur->count =
pag->pagf_longest.
IOWs, there is no "greater" sized free extent than tcur->count,
every free extent *must* be less than or equal to pag->pagf_longest.
The _ge() search is done because the start block of zero is less
than every agbno in the tree. Hence we have to do a _ge() search to
"find" the pag->pagf_longest extent based on start block criteria.
If we pass in a tcur->start = NULLAGBLOCK (0xffffffff) or
pag->pag_blocks then every agbno is "less than" the start block, and
so it should return the extent at the right most edge of the tree
with a _le() search regardless of where in the AG it is located.
Hence the initial search can also be a _le() search and we don't
have to special case it - the by-count tree has two components in
it's search key and if we set the initial values of both components
correctly one search works for all cases...
> > @@ -248,10 +235,35 @@ xfs_trim_gather_extents(
> > * supposed to discard skip it. Do not bother to trim
> > * down partially overlapping ranges for now.
> > */
> > - if (dbno + dlen < start || dbno > end) {
> > + if (fbno + flen < tcur->start) {
> > trace_xfs_discard_exclude(mp, pag->pag_agno, fbno, flen);
> > goto next_extent;
> > }
> > + if (fbno > tcur->end) {
> > + trace_xfs_discard_exclude(mp, pag->pag_agno, fbno, flen);
> > + if (tcur->by_len) {
> > + tcur->count = 0;
> > + break;
> > + }
> > + goto next_extent;
> > + }
> > +
> > + /* Trim the extent returned to the range we want. */
> > + if (fbno < tcur->start) {
> > + flen -= tcur->start - fbno;
> > + fbno = tcur->start;
> > + }
> > + if (fbno + flen > tcur->end + 1)
> > + flen = tcur->end - fbno + 1;
> > +
> > + /*
> > + * Too small? Give up.
> > + */
> > + if (flen < minlen) {
> > + trace_xfs_discard_toosmall(mp, pag->pag_agno, fbno, flen);
> > + tcur->count = 0;
> > + break;
> > + }
>
> For a by-bno search, this logic skips the entire rest of the AG after
> the first free extent that's smaller than tcur->minlen. Instead, it
> should goto next_extent, yes?
Yes.
> > @@ -415,12 +438,23 @@ xfs_ioc_trim(
> > start = BTOBB(range.start);
> > end = start + BTOBBT(range.len) - 1;
> >
> > - if (end > XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1)
> > - end = XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1;
>
> Couldn't this simply be:
>
> end = min_t(xfs_daddr_t, start + BTOBBT(range.len) - 1,
> XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks) - 1);
Yes.
-Dave.
--
Dave Chinner
david@fromorbit.com
next prev parent reply other threads:[~2024-03-30 21:51 UTC|newest]
Thread overview: 145+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-03-27 1:40 [PATCHBOMB v30] xfs: online fsck patches for 6.10 Darrick J. Wong
2024-03-27 1:46 ` [PATCHSET 01/15] xfs: bug fixes for 6.9 Darrick J. Wong
2024-03-27 1:50 ` [PATCH 1/1] xfs: fix potential AGI <-> ILOCK ABBA deadlock in xrep_dinode_findmode_walk_directory Darrick J. Wong
2024-03-27 16:56 ` Christoph Hellwig
2024-03-29 18:38 ` Darrick J. Wong
2024-04-03 5:18 ` [PATCHSET] xfs: bug fixes for 6.9 Darrick J. Wong
2024-04-03 5:18 ` [PATCH 1/3] xfs: pass xfs_buf lookup flags to xfs_*read_agi Darrick J. Wong
2024-04-05 14:53 ` Christoph Hellwig
2024-04-03 5:18 ` [PATCH 2/3] xfs: fix an AGI lock acquisition ordering problem in xrep_dinode_findmode Darrick J. Wong
2024-04-05 14:54 ` Christoph Hellwig
2024-04-05 16:52 ` Christoph Hellwig
2024-04-07 22:34 ` Dave Chinner
2024-04-09 22:51 ` Darrick J. Wong
2024-04-03 5:18 ` [PATCH 3/3] xfs: fix potential AGI <-> ILOCK ABBA deadlock in xrep_dinode_findmode_walk_directory Darrick J. Wong
2024-04-05 3:27 ` [PATCH 4/3] xfs: fix error bailout in xrep_abt_build_new_trees Darrick J. Wong
2024-04-05 5:17 ` Christoph Hellwig
2024-03-27 1:46 ` [PATCHSET v30.1 02/15] xfs: improve log incompat feature handling Darrick J. Wong
2024-03-27 1:50 ` [PATCH 1/2] xfs: only clear log incompat flags at clean unmount Darrick J. Wong
2024-04-07 22:48 ` Dave Chinner
2024-03-27 1:51 ` [PATCH 2/2] xfs: only add log incompat features with explicit permission Darrick J. Wong
2024-04-07 23:00 ` Dave Chinner
2024-04-09 22:53 ` Darrick J. Wong
2024-03-27 1:47 ` [PATCHSET v30.1 03/15] xfs: refactorings for atomic file content exchanges Darrick J. Wong
2024-03-27 1:51 ` [PATCH 1/7] xfs: move inode lease breaking functions to xfs_inode.c Darrick J. Wong
2024-03-27 1:51 ` [PATCH 2/7] xfs: move xfs_iops.c declarations out of xfs_inode.h Darrick J. Wong
2024-03-27 1:51 ` [PATCH 3/7] xfs: declare xfs_file.c symbols in xfs_file.h Darrick J. Wong
2024-03-27 1:52 ` [PATCH 4/7] xfs: create a new helper to return a file's allocation unit Darrick J. Wong
2024-03-27 1:52 ` [PATCH 5/7] xfs: hoist multi-fsb allocation unit detection to a helper Darrick J. Wong
2024-03-27 11:05 ` Christoph Hellwig
2024-04-07 23:07 ` Dave Chinner
2024-04-09 21:09 ` Darrick J. Wong
2024-03-27 1:52 ` [PATCH 6/7] xfs: refactor non-power-of-two alignment checks Darrick J. Wong
2024-03-27 1:52 ` [PATCH 7/7] xfs: constify xfs_bmap_is_written_extent Darrick J. Wong
2024-03-27 1:47 ` [PATCHSET v30.1 04/15] xfs: atomic file content exchanges Darrick J. Wong
2024-03-27 1:53 ` [PATCH 01/15] vfs: export remap and write check helpers Darrick J. Wong
2024-03-27 11:07 ` Christoph Hellwig
2024-03-29 19:45 ` Darrick J. Wong
2024-03-27 1:53 ` [PATCH 02/15] xfs: introduce new file range exchange ioctl Darrick J. Wong
2024-03-27 11:12 ` Christoph Hellwig
2024-03-27 1:53 ` [PATCH 03/15] xfs: create a log incompat flag for atomic file mapping exchanges Darrick J. Wong
2024-04-07 23:17 ` Dave Chinner
2024-04-09 21:12 ` Darrick J. Wong
2024-03-27 1:53 ` [PATCH 04/15] xfs: introduce a file mapping exchange log intent item Darrick J. Wong
2024-04-07 23:51 ` Dave Chinner
2024-04-09 1:18 ` Darrick J. Wong
2024-04-09 3:06 ` Darrick J. Wong
2024-03-27 1:54 ` [PATCH 05/15] xfs: create deferred log items for file mapping exchanges Darrick J. Wong
2024-03-27 1:54 ` [PATCH 06/15] xfs: bind together the front and back ends of the file range exchange code Darrick J. Wong
2024-04-08 0:05 ` Dave Chinner
2024-03-27 1:54 ` [PATCH 07/15] xfs: add error injection to test file mapping exchange recovery Darrick J. Wong
2024-03-27 1:54 ` [PATCH 08/15] xfs: condense extended attributes after a mapping exchange operation Darrick J. Wong
2024-03-27 1:55 ` [PATCH 09/15] xfs: condense directories " Darrick J. Wong
2024-03-27 1:55 ` [PATCH 10/15] xfs: condense symbolic links " Darrick J. Wong
2024-03-27 1:55 ` [PATCH 11/15] xfs: make file range exchange support realtime files Darrick J. Wong
2024-03-27 1:55 ` [PATCH 12/15] xfs: support non-power-of-two rtextsize with exchange-range Darrick J. Wong
2024-03-27 1:56 ` [PATCH 13/15] docs: update swapext -> exchmaps language Darrick J. Wong
2024-03-27 1:56 ` [PATCH 14/15] xfs: introduce new file range commit ioctls Darrick J. Wong
2024-03-27 11:06 ` Christoph Hellwig
2024-03-29 19:45 ` Darrick J. Wong
2024-03-27 1:56 ` [PATCH 15/15] xfs: enable logged file mapping exchange feature Darrick J. Wong
2024-03-27 1:47 ` [PATCHSET v30.1 05/15] xfs: create temporary files for online repair Darrick J. Wong
2024-03-27 1:57 ` [PATCH 1/4] xfs: hide private inodes from bulkstat and handle functions Darrick J. Wong
2024-03-27 11:12 ` Christoph Hellwig
2024-03-27 1:57 ` [PATCH 2/4] xfs: create temporary files and directories for online repair Darrick J. Wong
2024-03-27 1:57 ` [PATCH 3/4] xfs: refactor live buffer invalidation for repairs Darrick J. Wong
2024-03-27 1:57 ` [PATCH 4/4] xfs: add the ability to reap entire inode forks Darrick J. Wong
2024-03-27 1:47 ` [PATCHSET v30.1 06/15] xfs: online repair of realtime summaries Darrick J. Wong
2024-03-27 1:58 ` [PATCH 1/3] xfs: support preallocating and copying content into temporary files Darrick J. Wong
2024-03-27 1:58 ` [PATCH 2/3] xfs: teach the tempfile to set up atomic file content exchanges Darrick J. Wong
2024-03-27 1:58 ` [PATCH 3/3] xfs: online repair of realtime summaries Darrick J. Wong
2024-03-27 1:48 ` [PATCHSET v30.1 07/15] xfs: set and validate dir/attr block owners Darrick J. Wong
2024-03-27 1:58 ` [PATCH 01/10] xfs: add an explicit owner field to xfs_da_args Darrick J. Wong
2024-03-27 1:59 ` [PATCH 02/10] xfs: use the xfs_da_args owner field to set new dir/attr block owner Darrick J. Wong
2024-03-27 1:59 ` [PATCH 03/10] xfs: reduce indenting in xfs_attr_node_list Darrick J. Wong
2024-03-27 11:13 ` Christoph Hellwig
2024-03-28 17:39 ` Darrick J. Wong
2024-03-27 1:59 ` [PATCH 04/10] xfs: validate attr leaf buffer owners Darrick J. Wong
2024-03-27 1:59 ` [PATCH 05/10] xfs: validate attr remote value " Darrick J. Wong
2024-03-27 2:00 ` [PATCH 06/10] xfs: validate dabtree node " Darrick J. Wong
2024-03-27 2:00 ` [PATCH 07/10] xfs: validate directory leaf " Darrick J. Wong
2024-03-27 2:00 ` [PATCH 08/10] xfs: validate explicit directory data " Darrick J. Wong
2024-03-27 2:00 ` [PATCH 09/10] xfs: validate explicit directory block " Darrick J. Wong
2024-03-27 2:01 ` [PATCH 10/10] xfs: validate explicit directory free block owners Darrick J. Wong
2024-03-27 1:48 ` [PATCHSET v30.1 08/15] xfs: online repair of extended attributes Darrick J. Wong
2024-03-27 2:01 ` [PATCH 1/7] xfs: enable discarding of folios backing an xfile Darrick J. Wong
2024-03-27 2:01 ` [PATCH 2/7] xfs: create a blob array data structure Darrick J. Wong
2024-03-27 2:01 ` [PATCH 3/7] xfs: use atomic extent swapping to fix user file fork data Darrick J. Wong
2024-03-27 2:02 ` [PATCH 4/7] xfs: repair extended attributes Darrick J. Wong
2024-03-27 2:02 ` [PATCH 5/7] xfs: scrub should set preen if attr leaf has holes Darrick J. Wong
2024-03-27 2:02 ` [PATCH 6/7] xfs: flag empty xattr leaf blocks for optimization Darrick J. Wong
2024-03-27 2:03 ` [PATCH 7/7] xfs: create an xattr iteration function for scrub Darrick J. Wong
2024-03-27 11:15 ` Christoph Hellwig
2024-03-27 1:48 ` [PATCHSET v30.1 09/15] xfs: online repair of inode unlinked state Darrick J. Wong
2024-03-27 2:03 ` [PATCH 1/2] xfs: ensure unlinked list state is consistent with nlink during scrub Darrick J. Wong
2024-03-27 2:03 ` [PATCH 2/2] xfs: update the unlinked list when repairing link counts Darrick J. Wong
2024-03-27 1:48 ` [PATCHSET v30.1 10/15] xfs: online repair of directories Darrick J. Wong
2024-03-27 2:03 ` [PATCH 1/5] xfs: inactivate directory data blocks Darrick J. Wong
2024-03-27 2:04 ` [PATCH 2/5] xfs: online repair of directories Darrick J. Wong
2024-03-27 2:04 ` [PATCH 3/5] xfs: scan the filesystem to repair a directory dotdot entry Darrick J. Wong
2024-03-27 2:04 ` [PATCH 4/5] xfs: online repair of parent pointers Darrick J. Wong
2024-03-27 2:04 ` [PATCH 5/5] xfs: ask the dentry cache if it knows the parent of a directory Darrick J. Wong
2024-03-27 11:16 ` Christoph Hellwig
2024-03-29 19:52 ` Darrick J. Wong
2024-04-03 5:03 ` [PATCH v30.2 " Darrick J. Wong
2024-04-03 11:43 ` Christoph Hellwig
2024-03-27 1:49 ` [PATCHSET v30.1 11/15] xfs: move orphan files to lost and found Darrick J. Wong
2024-03-27 2:05 ` [PATCH 1/3] xfs: move orphan files to the orphanage Darrick J. Wong
2024-03-27 2:05 ` [PATCH 2/3] xfs: move files to orphanage instead of letting nlinks drop to zero Darrick J. Wong
2024-03-27 2:05 ` [PATCH 3/3] xfs: ensure dentry consistency when the orphanage adopts a file Darrick J. Wong
2024-03-27 1:49 ` [PATCHSET v30.1 12/15] xfs: online repair of symbolic links Darrick J. Wong
2024-03-27 2:05 ` [PATCH 1/1] " Darrick J. Wong
2024-03-27 16:53 ` Christoph Hellwig
2024-03-29 20:44 ` Darrick J. Wong
2024-03-29 20:58 ` Darrick J. Wong
2024-04-03 5:12 ` [PATCHSET v30.2] " Darrick J. Wong
2024-04-03 5:12 ` [PATCH 1/3] xfs: expose xfs_bmap_local_to_extents for online repair Darrick J. Wong
2024-04-03 11:43 ` Christoph Hellwig
2024-04-03 5:12 ` [PATCH 2/3] xfs: pass the owner to xfs_symlink_write_target Darrick J. Wong
2024-04-03 11:43 ` Christoph Hellwig
2024-04-03 5:12 ` [PATCH 3/3] xfs: online repair of symbolic links Darrick J. Wong
2024-04-03 11:44 ` Christoph Hellwig
2024-03-27 1:49 ` [PATCHSET v30.1 13/15] xfs: online fsck of iunlink buckets Darrick J. Wong
2024-03-27 2:06 ` [PATCH 1/3] xfs: check AGI unlinked inode buckets Darrick J. Wong
2024-03-27 2:06 ` [PATCH 2/3] xfs: hoist AGI repair context to a heap object Darrick J. Wong
2024-03-27 2:06 ` [PATCH 3/3] xfs: repair AGI unlinked inode bucket lists Darrick J. Wong
2024-03-27 1:49 ` [PATCHSET v30.1 14/15] xfs: inode-related repair fixes Darrick J. Wong
2024-03-27 2:06 ` [PATCH 1/4] xfs: check unused nlink fields in the ondisk inode Darrick J. Wong
2024-03-27 2:07 ` [PATCH 2/4] xfs: try to avoid allocating from sick inode clusters Darrick J. Wong
2024-03-27 2:07 ` [PATCH 3/4] xfs: pin inodes that would otherwise overflow link count Darrick J. Wong
2024-03-27 2:07 ` [PATCH 4/4] xfs: create subordinate scrub contexts for xchk_metadata_inode_subtype Darrick J. Wong
2024-03-27 1:50 ` [PATCHSET v30.1 15/15] xfs: less heavy locks during fstrim Darrick J. Wong
2024-03-27 2:07 ` [PATCH 1/1] xfs: fix severe performance problems when fstrimming a subset of an AG Darrick J. Wong
2024-03-27 11:35 ` Christoph Hellwig
2024-03-29 21:35 ` Darrick J. Wong
2024-03-30 5:38 ` Christoph Hellwig
2024-03-30 21:15 ` Dave Chinner
2024-03-31 22:44 ` Darrick J. Wong
2024-03-27 22:15 ` Dave Chinner
2024-03-29 22:51 ` Darrick J. Wong
2024-03-30 21:51 ` Dave Chinner [this message]
2024-03-31 22:44 ` Darrick J. Wong
2024-04-01 22:12 ` Dave Chinner
2024-04-03 5:07 ` [PATCH v30.2 " Darrick J. Wong
2024-04-04 21:46 ` Dave Chinner
-- strict thread matches above, loose matches on Subject: below --
2023-12-31 19:32 [PATCHSET v29.0 28/28] xfs: less heavy locks during fstrim Darrick J. Wong
2023-12-31 20:41 ` [PATCH 1/1] xfs: fix severe performance problems when fstrimming a subset of an AG Darrick J. Wong
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