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xfs: get rid of unnecessary xfs_perag_{get,put} pairs

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In the course of some operations, we look up the perag from
the mount multiple times to get or change perag information.
These are often very short pieces of code, so while the
lookup cost is generally low, the cost of the lookup is far
higher than the cost of the operation we are doing on the
perag.

Since we changed buffers to hold references to the perag
they are cached in, many modification contexts already hold
active references to the perag that are held across these
operations. This is especially true for any operation that
is serialised by an allocation group header buffer.

In these cases, we can just use the buffer's reference to
the perag to avoid needing to do lookups to access the
perag. This means that many operations don't need to do
perag lookups at all to access the perag because they've
already looked up objects that own persistent references
and hence can use that reference instead.

Cc: Dave Chinner <dchinner@redhat.com>
Cc: "Darrick J. Wong" <darrick.wong@oracle.com>
Signed-off-by: Gao Xiang <hsiangkao@redhat.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Gao Xiang 2020-07-13 09:13:00 -07:00 committed by Darrick J. Wong
parent c3f2375b90
commit 92a005448f
8 changed files with 34 additions and 91 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
fs/xfs/libxfs/xfs_ag.c
View File

@ -563,7 +563,8 @@ xfs_ag_get_geometry(
error = xfs_alloc_read_agf(mp, NULL, agno, 0, &agf_bp);
if (error)
goto out_agi;
pag = xfs_perag_get(mp, agno);
pag = agi_bp->b_pag;
/* Fill out form. */
memset(ageo, 0, sizeof(*ageo));
@ -583,7 +584,6 @@ xfs_ag_get_geometry(
xfs_ag_geom_health(pag, ageo);
/* Release resources. */
xfs_perag_put(pag);
xfs_buf_relse(agf_bp);
out_agi:
xfs_buf_relse(agi_bp);

12
fs/xfs/libxfs/xfs_ag_resv.h
View File

@ -37,16 +37,4 @@ xfs_ag_resv_rmapbt_alloc(
xfs_perag_put(pag);
}
static inline void
xfs_ag_resv_rmapbt_free(
struct xfs_mount *mp,
xfs_agnumber_t agno)
{
struct xfs_perag *pag;
pag = xfs_perag_get(mp, agno);
xfs_ag_resv_free_extent(pag, XFS_AG_RESV_RMAPBT, NULL, 1);
xfs_perag_put(pag);
}
#endif /* __XFS_AG_RESV_H__ */

22
fs/xfs/libxfs/xfs_alloc.c
View File

@ -710,13 +710,12 @@ xfs_alloc_read_agfl(
STATIC int
xfs_alloc_update_counters(
struct xfs_trans *tp,
struct xfs_perag *pag,
struct xfs_buf *agbp,
long len)
{
struct xfs_agf *agf = agbp->b_addr;
pag->pagf_freeblks += len;
agbp->b_pag->pagf_freeblks += len;
be32_add_cpu(&agf->agf_freeblks, len);
xfs_trans_agblocks_delta(tp, len);
@ -1175,8 +1174,7 @@ xfs_alloc_ag_vextent(
}
if (!args->wasfromfl) {
error = xfs_alloc_update_counters(args->tp, args->pag,
args->agbp,
error = xfs_alloc_update_counters(args->tp, args->agbp,
-((long)(args->len)));
if (error)
return error;
@ -1887,7 +1885,6 @@ xfs_free_ag_extent(
enum xfs_ag_resv_type type)
{
struct xfs_mount *mp;
struct xfs_perag *pag;
struct xfs_btree_cur *bno_cur;
struct xfs_btree_cur *cnt_cur;
xfs_agblock_t gtbno; /* start of right neighbor */
@ -2167,10 +2164,8 @@ xfs_free_ag_extent(
/*
* Update the freespace totals in the ag and superblock.
*/
pag = xfs_perag_get(mp, agno);
error = xfs_alloc_update_counters(tp, pag, agbp, len);
xfs_ag_resv_free_extent(pag, type, tp, len);
xfs_perag_put(pag);
error = xfs_alloc_update_counters(tp, agbp, len);
xfs_ag_resv_free_extent(agbp->b_pag, type, tp, len);
if (error)
goto error0;
@ -2689,7 +2684,7 @@ xfs_alloc_get_freelist(
if (be32_to_cpu(agf->agf_flfirst) == xfs_agfl_size(mp))
agf->agf_flfirst = 0;
pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno));
pag = agbp->b_pag;
ASSERT(!pag->pagf_agflreset);
be32_add_cpu(&agf->agf_flcount, -1);
xfs_trans_agflist_delta(tp, -1);
@ -2701,7 +2696,6 @@ xfs_alloc_get_freelist(
pag->pagf_btreeblks++;
logflags |= XFS_AGF_BTREEBLKS;
}
xfs_perag_put(pag);
xfs_alloc_log_agf(tp, agbp, logflags);
*bnop = bno;
@ -2797,7 +2791,7 @@ xfs_alloc_put_freelist(
if (be32_to_cpu(agf->agf_fllast) == xfs_agfl_size(mp))
agf->agf_fllast = 0;
pag = xfs_perag_get(mp, be32_to_cpu(agf->agf_seqno));
pag = agbp->b_pag;
ASSERT(!pag->pagf_agflreset);
be32_add_cpu(&agf->agf_flcount, 1);
xfs_trans_agflist_delta(tp, 1);
@ -2809,7 +2803,6 @@ xfs_alloc_put_freelist(
pag->pagf_btreeblks--;
logflags |= XFS_AGF_BTREEBLKS;
}
xfs_perag_put(pag);
xfs_alloc_log_agf(tp, agbp, logflags);
@ -3006,7 +2999,7 @@ xfs_alloc_read_agf(
ASSERT(!(*bpp)->b_error);
agf = (*bpp)->b_addr;
pag = xfs_perag_get(mp, agno);
pag = (*bpp)->b_pag;
if (!pag->pagf_init) {
pag->pagf_freeblks = be32_to_cpu(agf->agf_freeblks);
pag->pagf_btreeblks = be32_to_cpu(agf->agf_btreeblks);
@ -3034,7 +3027,6 @@ xfs_alloc_read_agf(
be32_to_cpu(agf->agf_levels[XFS_BTNUM_CNTi]));
}
#endif
xfs_perag_put(pag);
return 0;
}

8
fs/xfs/libxfs/xfs_alloc_btree.c
View File

@ -38,16 +38,14 @@ xfs_allocbt_set_root(
{
struct xfs_buf *agbp = cur->bc_ag.agbp;
struct xfs_agf *agf = agbp->b_addr;
xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
int btnum = cur->bc_btnum;
struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno);
struct xfs_perag *pag = agbp->b_pag;
ASSERT(ptr->s != 0);
agf->agf_roots[btnum] = ptr->s;
be32_add_cpu(&agf->agf_levels[btnum], inc);
pag->pagf_levels[btnum] += inc;
xfs_perag_put(pag);
xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
}
@ -115,7 +113,6 @@ xfs_allocbt_update_lastrec(
int reason)
{
struct xfs_agf *agf = cur->bc_ag.agbp->b_addr;
xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
struct xfs_perag *pag;
__be32 len;
int numrecs;
@ -160,9 +157,8 @@ xfs_allocbt_update_lastrec(
}
agf->agf_longest = len;
pag = xfs_perag_get(cur->bc_mp, seqno);
pag = cur->bc_ag.agbp->b_pag;
pag->pagf_longest = be32_to_cpu(len);
xfs_perag_put(pag);
xfs_alloc_log_agf(cur->bc_tp, cur->bc_ag.agbp, XFS_AGF_LONGEST);
}

28
fs/xfs/libxfs/xfs_ialloc.c
View File

@ -888,10 +888,9 @@ sparse_alloc:
*/
be32_add_cpu(&agi->agi_count, newlen);
be32_add_cpu(&agi->agi_freecount, newlen);
pag = xfs_perag_get(args.mp, agno);
pag = agbp->b_pag;
pag->pagi_freecount += newlen;
pag->pagi_count += newlen;
xfs_perag_put(pag);
agi->agi_newino = cpu_to_be32(newino);
/*
@ -1134,7 +1133,7 @@ xfs_dialloc_ag_inobt(
xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
xfs_agnumber_t pagno = XFS_INO_TO_AGNO(mp, parent);
xfs_agino_t pagino = XFS_INO_TO_AGINO(mp, parent);
struct xfs_perag *pag;
struct xfs_perag *pag = agbp->b_pag;
struct xfs_btree_cur *cur, *tcur;
struct xfs_inobt_rec_incore rec, trec;
xfs_ino_t ino;
@ -1143,8 +1142,6 @@ xfs_dialloc_ag_inobt(
int i, j;
int searchdistance = 10;
pag = xfs_perag_get(mp, agno);
ASSERT(pag->pagi_init);
ASSERT(pag->pagi_inodeok);
ASSERT(pag->pagi_freecount > 0);
@ -1384,14 +1381,12 @@ alloc_inode:
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -1);
xfs_perag_put(pag);
*inop = ino;
return 0;
error1:
xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
error0:
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
xfs_perag_put(pag);
return error;
}
@ -1587,7 +1582,6 @@ xfs_dialloc_ag(
xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
xfs_agnumber_t pagno = XFS_INO_TO_AGNO(mp, parent);
xfs_agino_t pagino = XFS_INO_TO_AGINO(mp, parent);
struct xfs_perag *pag;
struct xfs_btree_cur *cur; /* finobt cursor */
struct xfs_btree_cur *icur; /* inobt cursor */
struct xfs_inobt_rec_incore rec;
@ -1599,8 +1593,6 @@ xfs_dialloc_ag(
if (!xfs_sb_version_hasfinobt(&mp->m_sb))
return xfs_dialloc_ag_inobt(tp, agbp, parent, inop);
pag = xfs_perag_get(mp, agno);
/*
* If pagino is 0 (this is the root inode allocation) use newino.
* This must work because we've just allocated some.
@ -1667,7 +1659,7 @@ xfs_dialloc_ag(
*/
be32_add_cpu(&agi->agi_freecount, -1);
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
pag->pagi_freecount--;
agbp->b_pag->pagi_freecount--;
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -1);
@ -1680,7 +1672,6 @@ xfs_dialloc_ag(
xfs_btree_del_cursor(icur, XFS_BTREE_NOERROR);
xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
xfs_perag_put(pag);
*inop = ino;
return 0;
@ -1688,7 +1679,6 @@ error_icur:
xfs_btree_del_cursor(icur, XFS_BTREE_ERROR);
error_cur:
xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
xfs_perag_put(pag);
return error;
}
@ -1945,7 +1935,6 @@ xfs_difree_inobt(
{
struct xfs_agi *agi = agbp->b_addr;
xfs_agnumber_t agno = be32_to_cpu(agi->agi_seqno);
struct xfs_perag *pag;
struct xfs_btree_cur *cur;
struct xfs_inobt_rec_incore rec;
int ilen;
@ -2007,6 +1996,8 @@ xfs_difree_inobt(
if (!(mp->m_flags & XFS_MOUNT_IKEEP) &&
rec.ir_free == XFS_INOBT_ALL_FREE &&
mp->m_sb.sb_inopblock <= XFS_INODES_PER_CHUNK) {
struct xfs_perag *pag = agbp->b_pag;
xic->deleted = true;
xic->first_ino = XFS_AGINO_TO_INO(mp, agno, rec.ir_startino);
xic->alloc = xfs_inobt_irec_to_allocmask(&rec);
@ -2020,10 +2011,8 @@ xfs_difree_inobt(
be32_add_cpu(&agi->agi_count, -ilen);
be32_add_cpu(&agi->agi_freecount, -(ilen - 1));
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_COUNT | XFS_AGI_FREECOUNT);
pag = xfs_perag_get(mp, agno);
pag->pagi_freecount -= ilen - 1;
pag->pagi_count -= ilen;
xfs_perag_put(pag);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_ICOUNT, -ilen);
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, -(ilen - 1));
@ -2049,9 +2038,7 @@ xfs_difree_inobt(
*/
be32_add_cpu(&agi->agi_freecount, 1);
xfs_ialloc_log_agi(tp, agbp, XFS_AGI_FREECOUNT);
pag = xfs_perag_get(mp, agno);
pag->pagi_freecount++;
xfs_perag_put(pag);
agbp->b_pag->pagi_freecount++;
xfs_trans_mod_sb(tp, XFS_TRANS_SB_IFREE, 1);
}
@ -2661,7 +2648,7 @@ xfs_ialloc_read_agi(
return error;
agi = (*bpp)->b_addr;
pag = xfs_perag_get(mp, agno);
pag = (*bpp)->b_pag;
if (!pag->pagi_init) {
pag->pagi_freecount = be32_to_cpu(agi->agi_freecount);
pag->pagi_count = be32_to_cpu(agi->agi_count);
@ -2674,7 +2661,6 @@ xfs_ialloc_read_agi(
*/
ASSERT(pag->pagi_freecount == be32_to_cpu(agi->agi_freecount) ||
XFS_FORCED_SHUTDOWN(mp));
xfs_perag_put(pag);
return 0;
}

4
fs/xfs/libxfs/xfs_refcount_btree.c
View File

@ -37,15 +37,13 @@ xfs_refcountbt_set_root(
{
struct xfs_buf *agbp = cur->bc_ag.agbp;
struct xfs_agf *agf = agbp->b_addr;
xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno);
struct xfs_perag *pag = agbp->b_pag;
ASSERT(ptr->s != 0);
agf->agf_refcount_root = ptr->s;
be32_add_cpu(&agf->agf_refcount_level, inc);
pag->pagf_refcount_level += inc;
xfs_perag_put(pag);
xfs_alloc_log_agf(cur->bc_tp, agbp,
XFS_AGF_REFCOUNT_ROOT | XFS_AGF_REFCOUNT_LEVEL);

9
fs/xfs/libxfs/xfs_rmap_btree.c
View File

@ -63,16 +63,14 @@ xfs_rmapbt_set_root(
{
struct xfs_buf *agbp = cur->bc_ag.agbp;
struct xfs_agf *agf = agbp->b_addr;
xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
int btnum = cur->bc_btnum;
struct xfs_perag *pag = xfs_perag_get(cur->bc_mp, seqno);
struct xfs_perag *pag = agbp->b_pag;
ASSERT(ptr->s != 0);
agf->agf_roots[btnum] = ptr->s;
be32_add_cpu(&agf->agf_levels[btnum], inc);
pag->pagf_levels[btnum] += inc;
xfs_perag_put(pag);
xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
}
@ -123,6 +121,7 @@ xfs_rmapbt_free_block(
{
struct xfs_buf *agbp = cur->bc_ag.agbp;
struct xfs_agf *agf = agbp->b_addr;
struct xfs_perag *pag;
xfs_agblock_t bno;
int error;
@ -139,8 +138,8 @@ xfs_rmapbt_free_block(
XFS_EXTENT_BUSY_SKIP_DISCARD);
xfs_trans_agbtree_delta(cur->bc_tp, -1);
xfs_ag_resv_rmapbt_free(cur->bc_mp, cur->bc_ag.agno);
pag = cur->bc_ag.agbp->b_pag;
xfs_ag_resv_free_extent(pag, XFS_AG_RESV_RMAPBT, NULL, 1);
return 0;
}

38
fs/xfs/xfs_inode.c
View File

@ -2265,7 +2265,6 @@ xfs_iunlink(
}
if (next_agino != NULLAGINO) {
struct xfs_perag *pag;
xfs_agino_t old_agino;
/*
@ -2282,9 +2281,7 @@ xfs_iunlink(
* agino has been unlinked, add a backref from the next inode
* back to agino.
*/
pag = xfs_perag_get(mp, agno);
error = xfs_iunlink_add_backref(pag, agino, next_agino);
xfs_perag_put(pag);
error = xfs_iunlink_add_backref(agibp->b_pag, agino, next_agino);
if (error)
return error;
}
@ -2420,7 +2417,6 @@ xfs_iunlink_remove(
struct xfs_buf *agibp;
struct xfs_buf *last_ibp;
struct xfs_dinode *last_dip = NULL;
struct xfs_perag *pag = NULL;
xfs_agnumber_t agno = XFS_INO_TO_AGNO(mp, ip->i_ino);
xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ip->i_ino);
xfs_agino_t next_agino;
@ -2464,32 +2460,22 @@ xfs_iunlink_remove(
* this inode's backref to point from the next inode.
*/
if (next_agino != NULLAGINO) {
pag = xfs_perag_get(mp, agno);
error = xfs_iunlink_change_backref(pag, next_agino,
error = xfs_iunlink_change_backref(agibp->b_pag, next_agino,
NULLAGINO);
if (error)
goto out;
return error;
}
if (head_agino == agino) {
/* Point the head of the list to the next unlinked inode. */
error = xfs_iunlink_update_bucket(tp, agno, agibp, bucket_index,
next_agino);
if (error)
goto out;
} else {
if (head_agino != agino) {
struct xfs_imap imap;
xfs_agino_t prev_agino;
if (!pag)
pag = xfs_perag_get(mp, agno);
/* We need to search the list for the inode being freed. */
error = xfs_iunlink_map_prev(tp, agno, head_agino, agino,
&prev_agino, &imap, &last_dip, &last_ibp,
pag);
agibp->b_pag);
if (error)
goto out;
return error;
/* Point the previous inode on the list to the next inode. */
xfs_iunlink_update_dinode(tp, agno, prev_agino, last_ibp,
@ -2503,15 +2489,13 @@ xfs_iunlink_remove(
* change_backref takes care of deleting the backref if
* next_agino is NULLAGINO.
*/
error = xfs_iunlink_change_backref(pag, agino, next_agino);
if (error)
goto out;
return xfs_iunlink_change_backref(agibp->b_pag, agino,
next_agino);
}
out:
if (pag)
xfs_perag_put(pag);
return error;
/* Point the head of the list to the next unlinked inode. */
return xfs_iunlink_update_bucket(tp, agno, agibp, bucket_index,
next_agino);
}
/*