On Tue, Feb 23, 2021 at 04:47:46PM +1100, Dave Chinner wrote: > From: Dave Chinner <dchinner@xxxxxxxxxx> > > From a concurrent rm -rf workload: > > 41.04% [kernel] [k] xfs_dir3_leaf_check_int > 9.85% [kernel] [k] __xfs_dir3_data_check > 5.60% [kernel] [k] xfs_verify_ino > 5.32% [kernel] [k] xfs_agino_range > 4.21% [kernel] [k] memcpy > 3.06% [kernel] [k] xfs_errortag_test > 2.57% [kernel] [k] xfs_dir_ino_validate > 1.66% [kernel] [k] xfs_dir2_data_get_ftype > 1.17% [kernel] [k] do_raw_spin_lock > 1.11% [kernel] [k] xfs_verify_dir_ino > 0.84% [kernel] [k] __raw_callee_save___pv_queued_spin_unlock > 0.83% [kernel] [k] xfs_buf_find > 0.64% [kernel] [k] xfs_log_commit_cil > > THere's an awful lot of overhead in just range checking inode > numbers in that, but each inode number check is not a lot of code. > The total is a bit over 14.5% of the CPU time is spent validating > inode numbers. > > The problem is that they deeply nested global scope functions so the > overhead here is all in function call marshalling. > > text data bss dec hex filename > 2077 0 0 2077 81d fs/xfs/libxfs/xfs_types.o.orig > 2197 0 0 2197 895 fs/xfs/libxfs/xfs_types.o > > There's a small increase in binary size by inlining all the local > nested calls in the verifier functions, but the same workload now > profiles as: > > 40.69% [kernel] [k] xfs_dir3_leaf_check_int > 10.52% [kernel] [k] __xfs_dir3_data_check > 6.68% [kernel] [k] xfs_verify_dir_ino > 4.22% [kernel] [k] xfs_errortag_test > 4.15% [kernel] [k] memcpy > 3.53% [kernel] [k] xfs_dir_ino_validate > 1.87% [kernel] [k] xfs_dir2_data_get_ftype > 1.37% [kernel] [k] do_raw_spin_lock > 0.98% [kernel] [k] xfs_buf_find > 0.94% [kernel] [k] __raw_callee_save___pv_queued_spin_unlock > 0.73% [kernel] [k] xfs_log_commit_cil > > Now we only spend just over 10% of the time validing inode numbers > for the same workload. Hence a few "inline" keyworks is good enough > to reduce the validation overhead by 30%... > > Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx> Looks fine I guess, Reviewed-by: Darrick J. Wong <djwong@xxxxxxxxxx> --D > --- > fs/xfs/libxfs/xfs_types.c | 18 +++++++++--------- > 1 file changed, 9 insertions(+), 9 deletions(-) > > diff --git a/fs/xfs/libxfs/xfs_types.c b/fs/xfs/libxfs/xfs_types.c > index b254fbeaaa50..04801362e1a7 100644 > --- a/fs/xfs/libxfs/xfs_types.c > +++ b/fs/xfs/libxfs/xfs_types.c > @@ -13,7 +13,7 @@ > #include "xfs_mount.h" > > /* Find the size of the AG, in blocks. */ > -xfs_agblock_t > +inline xfs_agblock_t > xfs_ag_block_count( > struct xfs_mount *mp, > xfs_agnumber_t agno) > @@ -29,7 +29,7 @@ xfs_ag_block_count( > * Verify that an AG block number pointer neither points outside the AG > * nor points at static metadata. > */ > -bool > +inline bool > xfs_verify_agbno( > struct xfs_mount *mp, > xfs_agnumber_t agno, > @@ -49,7 +49,7 @@ xfs_verify_agbno( > * Verify that an FS block number pointer neither points outside the > * filesystem nor points at static AG metadata. > */ > -bool > +inline bool > xfs_verify_fsbno( > struct xfs_mount *mp, > xfs_fsblock_t fsbno) > @@ -85,7 +85,7 @@ xfs_verify_fsbext( > } > > /* Calculate the first and last possible inode number in an AG. */ > -void > +inline void > xfs_agino_range( > struct xfs_mount *mp, > xfs_agnumber_t agno, > @@ -116,7 +116,7 @@ xfs_agino_range( > * Verify that an AG inode number pointer neither points outside the AG > * nor points at static metadata. > */ > -bool > +inline bool > xfs_verify_agino( > struct xfs_mount *mp, > xfs_agnumber_t agno, > @@ -146,7 +146,7 @@ xfs_verify_agino_or_null( > * Verify that an FS inode number pointer neither points outside the > * filesystem nor points at static AG metadata. > */ > -bool > +inline bool > xfs_verify_ino( > struct xfs_mount *mp, > xfs_ino_t ino) > @@ -162,7 +162,7 @@ xfs_verify_ino( > } > > /* Is this an internal inode number? */ > -bool > +inline bool > xfs_internal_inum( > struct xfs_mount *mp, > xfs_ino_t ino) > @@ -190,7 +190,7 @@ xfs_verify_dir_ino( > * Verify that an realtime block number pointer doesn't point off the > * end of the realtime device. > */ > -bool > +inline bool > xfs_verify_rtbno( > struct xfs_mount *mp, > xfs_rtblock_t rtbno) > @@ -215,7 +215,7 @@ xfs_verify_rtext( > } > > /* Calculate the range of valid icount values. */ > -void > +inline void > xfs_icount_range( > struct xfs_mount *mp, > unsigned long long *min, > -- > 2.28.0 >
