From: Brian Foster <bfoster@redhat.com>
To: "Darrick J. Wong" <darrick.wong@oracle.com>
Cc: linux-xfs@vger.kernel.org
Subject: Re: [PATCH v4 03/11] xfs: track allocation busy state in allocation cursor
Date: Thu, 19 Sep 2019 10:58:17 -0400 [thread overview]
Message-ID: <20190919145817.GB35460@bfoster> (raw)
In-Reply-To: <20190918184832.GR2229799@magnolia>
On Wed, Sep 18, 2019 at 11:48:32AM -0700, Darrick J. Wong wrote:
> On Mon, Sep 16, 2019 at 08:16:27AM -0400, Brian Foster wrote:
> > Extend the allocation cursor to track extent busy state for an
> > allocation attempt. No functional changes.
> >
> > Signed-off-by: Brian Foster <bfoster@redhat.com>
> > ---
> > fs/xfs/libxfs/xfs_alloc.c | 25 ++++++++++++++-----------
> > 1 file changed, 14 insertions(+), 11 deletions(-)
> >
> > diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
> > index d159377ed603..5c34d4c41761 100644
> > --- a/fs/xfs/libxfs/xfs_alloc.c
> > +++ b/fs/xfs/libxfs/xfs_alloc.c
> > @@ -716,6 +716,8 @@ struct xfs_alloc_cur {
> > struct xfs_btree_cur *cnt; /* btree cursors */
> > struct xfs_btree_cur *bnolt;
> > struct xfs_btree_cur *bnogt;
> > + unsigned busy_gen;/* busy state */
>
> Nit: unsigned int here?
>
> 'unsigned' without the 'int' looks a little funny to me, but eh
> whatever, I guess we do that in the iomap code so:
>
Yeah, I was just copying from the original code and the lack of an int
didn't even register. Easy enough to fix. Note that there are still
other uses of 'unsigned busy_gen,' but those should be replaced with
this one over time..
Brian
> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
>
> --D
>
> > + bool busy;
> > };
> >
> > /*
> > @@ -733,6 +735,9 @@ xfs_alloc_cur_setup(
> >
> > ASSERT(args->alignment == 1 || args->type != XFS_ALLOCTYPE_THIS_BNO);
> >
> > + acur->busy = false;
> > + acur->busy_gen = 0;
> > +
> > /*
> > * Perform an initial cntbt lookup to check for availability of maxlen
> > * extents. If this fails, we'll return -ENOSPC to signal the caller to
> > @@ -1185,8 +1190,6 @@ xfs_alloc_ag_vextent_near(
> > xfs_extlen_t ltlena; /* aligned ... */
> > xfs_agblock_t ltnew; /* useful start bno of left side */
> > xfs_extlen_t rlen; /* length of returned extent */
> > - bool busy;
> > - unsigned busy_gen;
> > #ifdef DEBUG
> > /*
> > * Randomly don't execute the first algorithm.
> > @@ -1211,7 +1214,6 @@ xfs_alloc_ag_vextent_near(
> > ltlen = 0;
> > gtlena = 0;
> > ltlena = 0;
> > - busy = false;
> >
> > /*
> > * Set up cursors and see if there are any free extents as big as
> > @@ -1290,8 +1292,8 @@ xfs_alloc_ag_vextent_near(
> > if (error)
> > goto out;
> > XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, out);
> > - busy = xfs_alloc_compute_aligned(args, ltbno, ltlen,
> > - <bnoa, <lena, &busy_gen);
> > + acur.busy = xfs_alloc_compute_aligned(args, ltbno, ltlen,
> > + <bnoa, <lena, &acur.busy_gen);
> > if (ltlena < args->minlen)
> > continue;
> > if (ltbnoa < args->min_agbno || ltbnoa > args->max_agbno)
> > @@ -1373,8 +1375,8 @@ xfs_alloc_ag_vextent_near(
> > if (error)
> > goto out;
> > XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, out);
> > - busy |= xfs_alloc_compute_aligned(args, ltbno, ltlen,
> > - <bnoa, <lena, &busy_gen);
> > + acur.busy |= xfs_alloc_compute_aligned(args, ltbno,
> > + ltlen, <bnoa, <lena, &acur.busy_gen);
> > if (ltlena >= args->minlen && ltbnoa >= args->min_agbno)
> > break;
> > error = xfs_btree_decrement(acur.bnolt, 0, &i);
> > @@ -1388,8 +1390,8 @@ xfs_alloc_ag_vextent_near(
> > if (error)
> > goto out;
> > XFS_WANT_CORRUPTED_GOTO(args->mp, i == 1, out);
> > - busy |= xfs_alloc_compute_aligned(args, gtbno, gtlen,
> > - >bnoa, >lena, &busy_gen);
> > + acur.busy |= xfs_alloc_compute_aligned(args, gtbno,
> > + gtlen, >bnoa, >lena, &acur.busy_gen);
> > if (gtlena >= args->minlen && gtbnoa <= args->max_agbno)
> > break;
> > error = xfs_btree_increment(acur.bnogt, 0, &i);
> > @@ -1449,9 +1451,10 @@ xfs_alloc_ag_vextent_near(
> > */
> > if (!xfs_alloc_cur_active(acur.bnolt) &&
> > !xfs_alloc_cur_active(acur.bnogt)) {
> > - if (busy) {
> > + if (acur.busy) {
> > trace_xfs_alloc_near_busy(args);
> > - xfs_extent_busy_flush(args->mp, args->pag, busy_gen);
> > + xfs_extent_busy_flush(args->mp, args->pag,
> > + acur.busy_gen);
> > goto restart;
> > }
> > trace_xfs_alloc_size_neither(args);
> > --
> > 2.20.1
> >
next prev parent reply other threads:[~2019-09-19 14:58 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-16 12:16 [PATCH v4 00/11] xfs: rework near mode extent allocation Brian Foster
2019-09-16 12:16 ` [PATCH v4 01/11] xfs: track active state of allocation btree cursors Brian Foster
2019-09-18 18:38 ` Darrick J. Wong
2019-09-19 14:57 ` Brian Foster
2019-09-16 12:16 ` [PATCH v4 02/11] xfs: introduce allocation cursor data structure Brian Foster
2019-09-18 18:46 ` Darrick J. Wong
2019-09-16 12:16 ` [PATCH v4 03/11] xfs: track allocation busy state in allocation cursor Brian Foster
2019-09-18 18:48 ` Darrick J. Wong
2019-09-19 14:58 ` Brian Foster [this message]
2019-09-16 12:16 ` [PATCH v4 04/11] xfs: track best extent from cntbt lastblock scan in alloc cursor Brian Foster
2019-09-18 18:56 ` Darrick J. Wong
2019-09-19 15:00 ` Brian Foster
2019-09-16 12:16 ` [PATCH v4 05/11] xfs: refactor cntbt lastblock scan best extent logic into helper Brian Foster
2019-09-18 19:03 ` Darrick J. Wong
2019-09-19 15:01 ` Brian Foster
2019-09-16 12:16 ` [PATCH v4 06/11] xfs: reuse best extent tracking logic for bnobt scan Brian Foster
2019-09-18 20:43 ` Darrick J. Wong
2019-09-19 15:04 ` Brian Foster
2019-10-04 22:44 ` Darrick J. Wong
2019-10-07 11:08 ` Brian Foster
2019-09-16 12:16 ` [PATCH v4 07/11] xfs: refactor allocation tree fixup code Brian Foster
2019-09-18 20:44 ` Darrick J. Wong
2019-09-16 12:16 ` [PATCH v4 08/11] xfs: refactor and reuse best extent scanning logic Brian Foster
2019-09-18 21:03 ` Darrick J. Wong
2019-09-19 15:04 ` Brian Foster
2019-09-16 12:16 ` [PATCH v4 09/11] xfs: refactor near mode alloc bnobt scan into separate function Brian Foster
2019-09-18 20:55 ` Darrick J. Wong
2019-09-16 12:16 ` [PATCH v4 10/11] xfs: factor out tree fixup logic into helper Brian Foster
2019-09-18 20:56 ` Darrick J. Wong
2019-09-16 12:16 ` [PATCH v4 11/11] xfs: optimize near mode bnobt scans with concurrent cntbt lookups Brian Foster
2019-09-18 21:11 ` Darrick J. Wong
2019-09-19 15:05 ` Brian Foster
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