| Message ID | 20190918082453.25266-2-cmaiolino@redhat.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Headers | show |
| Series | A small improvement in the allocation algorithm | expand |
On Wed, Sep 18, 2019 at 10:24:52AM +0200, Carlos Maiolino wrote: > From: Dave Chinner <dchinner@redhat.com> > > Cap longest extent to the largest we can allocate based on limits > calculated at mount time. Dynamic state (such as finobt blocks) > can result in the longest free extent exceeding the size we can > allocate, and that results in failure to align full AG allocations > when the AG is empty. > > Result: > > xfs_io-4413 [003] 426.412459: xfs_alloc_vextent_loopfailed: dev 8:96 agno 0 agbno 32 minlen 243968 maxlen 244000 mod 0 prod 1 minleft 1 total 262148 alignment 32 minalignslop 0 len 0 type NEAR_BNO otype START_BNO wasdel 0 wasfromfl 0 resv 0 datatype 0x5 firstblock 0xffffffffffffffff > > minlen and maxlen are now separated by the alignment size, and > allocation fails because args.total > free space in the AG. > > Signed-off-by: Dave Chinner <dchinner@redhat.com> > Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com> > --- Seems fine, but what about the bma.minlen alignment fix (in xfs_bmap_btalloc()) Dave suggested in the previous thread? Brian > fs/xfs/libxfs/xfs_alloc.c | 3 ++- > 1 file changed, 2 insertions(+), 1 deletion(-) > > diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c > index 372ad55631fc..35b39fc863a0 100644 > --- a/fs/xfs/libxfs/xfs_alloc.c > +++ b/fs/xfs/libxfs/xfs_alloc.c > @@ -1989,7 +1989,8 @@ xfs_alloc_longest_free_extent( > * reservations and AGFL rules in place, we can return this extent. > */ > if (pag->pagf_longest > delta) > - return pag->pagf_longest - delta; > + return min_t(xfs_extlen_t, pag->pag_mount->m_ag_max_usable, > + pag->pagf_longest - delta); > > /* Otherwise, let the caller try for 1 block if there's space. */ > return pag->pagf_flcount > 0 || pag->pagf_longest > 0; > -- > 2.20.1 >
On Wed, Sep 18, 2019 at 08:27:26AM -0400, Brian Foster wrote: > On Wed, Sep 18, 2019 at 10:24:52AM +0200, Carlos Maiolino wrote: > > From: Dave Chinner <dchinner@redhat.com> > > > > Cap longest extent to the largest we can allocate based on limits > > calculated at mount time. Dynamic state (such as finobt blocks) > > can result in the longest free extent exceeding the size we can > > allocate, and that results in failure to align full AG allocations > > when the AG is empty. > > > > Result: > > > > xfs_io-4413 [003] 426.412459: xfs_alloc_vextent_loopfailed: dev 8:96 agno 0 agbno 32 minlen 243968 maxlen 244000 mod 0 prod 1 minleft 1 total 262148 alignment 32 minalignslop 0 len 0 type NEAR_BNO otype START_BNO wasdel 0 wasfromfl 0 resv 0 datatype 0x5 firstblock 0xffffffffffffffff > > > > minlen and maxlen are now separated by the alignment size, and > > allocation fails because args.total > free space in the AG. > > > > Signed-off-by: Dave Chinner <dchinner@redhat.com> > > Signed-off-by: Carlos Maiolino <cmaiolino@redhat.com> > > --- > > Seems fine, but what about the bma.minlen alignment fix (in > xfs_bmap_btalloc()) Dave suggested in the previous thread? I forgot to git add that while playing with this set :P > > Brian > > > fs/xfs/libxfs/xfs_alloc.c | 3 ++- > > 1 file changed, 2 insertions(+), 1 deletion(-) > > > > diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c > > index 372ad55631fc..35b39fc863a0 100644 > > --- a/fs/xfs/libxfs/xfs_alloc.c > > +++ b/fs/xfs/libxfs/xfs_alloc.c > > @@ -1989,7 +1989,8 @@ xfs_alloc_longest_free_extent( > > * reservations and AGFL rules in place, we can return this extent. > > */ > > if (pag->pagf_longest > delta) > > - return pag->pagf_longest - delta; > > + return min_t(xfs_extlen_t, pag->pag_mount->m_ag_max_usable, > > + pag->pagf_longest - delta); > > > > /* Otherwise, let the caller try for 1 block if there's space. */ > > return pag->pagf_flcount > 0 || pag->pagf_longest > 0; > > -- > > 2.20.1 > >
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c index 372ad55631fc..35b39fc863a0 100644 --- a/fs/xfs/libxfs/xfs_alloc.c +++ b/fs/xfs/libxfs/xfs_alloc.c @@ -1989,7 +1989,8 @@ xfs_alloc_longest_free_extent( * reservations and AGFL rules in place, we can return this extent. */ if (pag->pagf_longest > delta) - return pag->pagf_longest - delta; + return min_t(xfs_extlen_t, pag->pag_mount->m_ag_max_usable, + pag->pagf_longest - delta); /* Otherwise, let the caller try for 1 block if there's space. */ return pag->pagf_flcount > 0 || pag->pagf_longest > 0;