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authorDave Chinner <dchinner@redhat.com>2016-12-05 06:38:58 +0300
committerDave Chinner <david@fromorbit.com>2016-12-05 06:38:58 +0300
commit11ef38afe98cc7ad1a46ef24945232ec1760d5e2 (patch)
treeb198c9b46f06a7bcac329cd9d9a6a913ae3312ad /fs/xfs/xfs_stats.h
parent1bb33a98702d8360947f18a44349df75ba555d5d (diff)
downloadlinux-11ef38afe98cc7ad1a46ef24945232ec1760d5e2.tar.xz
xfs: make xfs btree stats less huge
Embedding a switch statement in every btree stats inc/add adds a lot of code overhead to the core btree infrastructure paths. Stats are supposed to be small and lightweight, but the btree stats have become big and bloated as we've added more btrees. It needs fixing because the reflink code will just add more overhead again. Convert the v2 btree stats to arrays instead of independent variables, and instead use the type to index the specific btree array via an enum. This allows us to use array based indexing to update the stats, rather than having to derefence variables specific to the btree type. If we then wrap the xfsstats structure in a union and place uint32_t array beside it, and calculate the correct btree stats array base array index when creating a btree cursor, we can easily access entries in the stats structure without having to switch names based on the btree type. We then replace with the switch statement with a simple set of stats wrapper macros, resulting in a significant simplification of the btree stats code, and: text data bss dec hex filename 48905 144 8 49057 bfa1 fs/xfs/libxfs/xfs_btree.o.old 36793 144 8 36945 9051 fs/xfs/libxfs/xfs_btree.o it reduces the core btree infrastructure code size by close to 25%! Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_stats.h')
-rw-r--r--fs/xfs/xfs_stats.h200
1 files changed, 81 insertions, 119 deletions
diff --git a/fs/xfs/xfs_stats.h b/fs/xfs/xfs_stats.h
index 79ad2e69fc33..375840f5a99a 100644
--- a/fs/xfs/xfs_stats.h
+++ b/fs/xfs/xfs_stats.h
@@ -22,9 +22,37 @@
#include <linux/percpu.h>
/*
+ * The btree stats arrays have fixed offsets for the different stats. We
+ * store the base index in the btree cursor via XFS_STATS_CALC_INDEX() and
+ * that allows us to use fixed offsets into the stats array for each btree
+ * stat. These index offsets are defined in the order they will be emitted
+ * in the stats files, so it is possible to add new btree stat types by
+ * appending to the enum list below.
+ */
+enum {
+ __XBTS_lookup = 0,
+ __XBTS_compare = 1,
+ __XBTS_insrec = 2,
+ __XBTS_delrec = 3,
+ __XBTS_newroot = 4,
+ __XBTS_killroot = 5,
+ __XBTS_increment = 6,
+ __XBTS_decrement = 7,
+ __XBTS_lshift = 8,
+ __XBTS_rshift = 9,
+ __XBTS_split = 10,
+ __XBTS_join = 11,
+ __XBTS_alloc = 12,
+ __XBTS_free = 13,
+ __XBTS_moves = 14,
+
+ __XBTS_MAX = 15,
+};
+
+/*
* XFS global statistics
*/
-struct xfsstats {
+struct __xfsstats {
# define XFSSTAT_END_EXTENT_ALLOC 4
__uint32_t xs_allocx;
__uint32_t xs_allocb;
@@ -117,118 +145,20 @@ struct xfsstats {
__uint32_t xb_page_found;
__uint32_t xb_get_read;
/* Version 2 btree counters */
-#define XFSSTAT_END_ABTB_V2 (XFSSTAT_END_BUF+15)
- __uint32_t xs_abtb_2_lookup;
- __uint32_t xs_abtb_2_compare;
- __uint32_t xs_abtb_2_insrec;
- __uint32_t xs_abtb_2_delrec;
- __uint32_t xs_abtb_2_newroot;
- __uint32_t xs_abtb_2_killroot;
- __uint32_t xs_abtb_2_increment;
- __uint32_t xs_abtb_2_decrement;
- __uint32_t xs_abtb_2_lshift;
- __uint32_t xs_abtb_2_rshift;
- __uint32_t xs_abtb_2_split;
- __uint32_t xs_abtb_2_join;
- __uint32_t xs_abtb_2_alloc;
- __uint32_t xs_abtb_2_free;
- __uint32_t xs_abtb_2_moves;
-#define XFSSTAT_END_ABTC_V2 (XFSSTAT_END_ABTB_V2+15)
- __uint32_t xs_abtc_2_lookup;
- __uint32_t xs_abtc_2_compare;
- __uint32_t xs_abtc_2_insrec;
- __uint32_t xs_abtc_2_delrec;
- __uint32_t xs_abtc_2_newroot;
- __uint32_t xs_abtc_2_killroot;
- __uint32_t xs_abtc_2_increment;
- __uint32_t xs_abtc_2_decrement;
- __uint32_t xs_abtc_2_lshift;
- __uint32_t xs_abtc_2_rshift;
- __uint32_t xs_abtc_2_split;
- __uint32_t xs_abtc_2_join;
- __uint32_t xs_abtc_2_alloc;
- __uint32_t xs_abtc_2_free;
- __uint32_t xs_abtc_2_moves;
-#define XFSSTAT_END_BMBT_V2 (XFSSTAT_END_ABTC_V2+15)
- __uint32_t xs_bmbt_2_lookup;
- __uint32_t xs_bmbt_2_compare;
- __uint32_t xs_bmbt_2_insrec;
- __uint32_t xs_bmbt_2_delrec;
- __uint32_t xs_bmbt_2_newroot;
- __uint32_t xs_bmbt_2_killroot;
- __uint32_t xs_bmbt_2_increment;
- __uint32_t xs_bmbt_2_decrement;
- __uint32_t xs_bmbt_2_lshift;
- __uint32_t xs_bmbt_2_rshift;
- __uint32_t xs_bmbt_2_split;
- __uint32_t xs_bmbt_2_join;
- __uint32_t xs_bmbt_2_alloc;
- __uint32_t xs_bmbt_2_free;
- __uint32_t xs_bmbt_2_moves;
-#define XFSSTAT_END_IBT_V2 (XFSSTAT_END_BMBT_V2+15)
- __uint32_t xs_ibt_2_lookup;
- __uint32_t xs_ibt_2_compare;
- __uint32_t xs_ibt_2_insrec;
- __uint32_t xs_ibt_2_delrec;
- __uint32_t xs_ibt_2_newroot;
- __uint32_t xs_ibt_2_killroot;
- __uint32_t xs_ibt_2_increment;
- __uint32_t xs_ibt_2_decrement;
- __uint32_t xs_ibt_2_lshift;
- __uint32_t xs_ibt_2_rshift;
- __uint32_t xs_ibt_2_split;
- __uint32_t xs_ibt_2_join;
- __uint32_t xs_ibt_2_alloc;
- __uint32_t xs_ibt_2_free;
- __uint32_t xs_ibt_2_moves;
-#define XFSSTAT_END_FIBT_V2 (XFSSTAT_END_IBT_V2+15)
- __uint32_t xs_fibt_2_lookup;
- __uint32_t xs_fibt_2_compare;
- __uint32_t xs_fibt_2_insrec;
- __uint32_t xs_fibt_2_delrec;
- __uint32_t xs_fibt_2_newroot;
- __uint32_t xs_fibt_2_killroot;
- __uint32_t xs_fibt_2_increment;
- __uint32_t xs_fibt_2_decrement;
- __uint32_t xs_fibt_2_lshift;
- __uint32_t xs_fibt_2_rshift;
- __uint32_t xs_fibt_2_split;
- __uint32_t xs_fibt_2_join;
- __uint32_t xs_fibt_2_alloc;
- __uint32_t xs_fibt_2_free;
- __uint32_t xs_fibt_2_moves;
-#define XFSSTAT_END_RMAP_V2 (XFSSTAT_END_FIBT_V2+15)
- __uint32_t xs_rmap_2_lookup;
- __uint32_t xs_rmap_2_compare;
- __uint32_t xs_rmap_2_insrec;
- __uint32_t xs_rmap_2_delrec;
- __uint32_t xs_rmap_2_newroot;
- __uint32_t xs_rmap_2_killroot;
- __uint32_t xs_rmap_2_increment;
- __uint32_t xs_rmap_2_decrement;
- __uint32_t xs_rmap_2_lshift;
- __uint32_t xs_rmap_2_rshift;
- __uint32_t xs_rmap_2_split;
- __uint32_t xs_rmap_2_join;
- __uint32_t xs_rmap_2_alloc;
- __uint32_t xs_rmap_2_free;
- __uint32_t xs_rmap_2_moves;
-#define XFSSTAT_END_REFCOUNT (XFSSTAT_END_RMAP_V2 + 15)
- __uint32_t xs_refcbt_2_lookup;
- __uint32_t xs_refcbt_2_compare;
- __uint32_t xs_refcbt_2_insrec;
- __uint32_t xs_refcbt_2_delrec;
- __uint32_t xs_refcbt_2_newroot;
- __uint32_t xs_refcbt_2_killroot;
- __uint32_t xs_refcbt_2_increment;
- __uint32_t xs_refcbt_2_decrement;
- __uint32_t xs_refcbt_2_lshift;
- __uint32_t xs_refcbt_2_rshift;
- __uint32_t xs_refcbt_2_split;
- __uint32_t xs_refcbt_2_join;
- __uint32_t xs_refcbt_2_alloc;
- __uint32_t xs_refcbt_2_free;
- __uint32_t xs_refcbt_2_moves;
+#define XFSSTAT_END_ABTB_V2 (XFSSTAT_END_BUF + __XBTS_MAX)
+ __uint32_t xs_abtb_2[__XBTS_MAX];
+#define XFSSTAT_END_ABTC_V2 (XFSSTAT_END_ABTB_V2 + __XBTS_MAX)
+ __uint32_t xs_abtc_2[__XBTS_MAX];
+#define XFSSTAT_END_BMBT_V2 (XFSSTAT_END_ABTC_V2 + __XBTS_MAX)
+ __uint32_t xs_bmbt_2[__XBTS_MAX];
+#define XFSSTAT_END_IBT_V2 (XFSSTAT_END_BMBT_V2 + __XBTS_MAX)
+ __uint32_t xs_ibt_2[__XBTS_MAX];
+#define XFSSTAT_END_FIBT_V2 (XFSSTAT_END_IBT_V2 + __XBTS_MAX)
+ __uint32_t xs_fibt_2[__XBTS_MAX];
+#define XFSSTAT_END_RMAP_V2 (XFSSTAT_END_FIBT_V2 + __XBTS_MAX)
+ __uint32_t xs_rmap_2[__XBTS_MAX];
+#define XFSSTAT_END_REFCOUNT (XFSSTAT_END_RMAP_V2 + __XBTS_MAX)
+ __uint32_t xs_refcbt_2[__XBTS_MAX];
#define XFSSTAT_END_XQMSTAT (XFSSTAT_END_REFCOUNT + 6)
__uint32_t xs_qm_dqreclaims;
__uint32_t xs_qm_dqreclaim_misses;
@@ -245,26 +175,58 @@ struct xfsstats {
__uint64_t xs_read_bytes;
};
+struct xfsstats {
+ union {
+ struct __xfsstats s;
+ uint32_t a[XFSSTAT_END_XQMSTAT];
+ };
+};
+
+/*
+ * simple wrapper for getting the array index of s struct member offset
+ */
+#define XFS_STATS_CALC_INDEX(member) \
+ (offsetof(struct __xfsstats, member) / (int)sizeof(__uint32_t))
+
+
int xfs_stats_format(struct xfsstats __percpu *stats, char *buf);
void xfs_stats_clearall(struct xfsstats __percpu *stats);
extern struct xstats xfsstats;
#define XFS_STATS_INC(mp, v) \
do { \
- per_cpu_ptr(xfsstats.xs_stats, current_cpu())->v++; \
- per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->v++; \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->s.v++; \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->s.v++; \
} while (0)
#define XFS_STATS_DEC(mp, v) \
do { \
- per_cpu_ptr(xfsstats.xs_stats, current_cpu())->v--; \
- per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->v--; \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->s.v--; \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->s.v--; \
} while (0)
#define XFS_STATS_ADD(mp, v, inc) \
do { \
- per_cpu_ptr(xfsstats.xs_stats, current_cpu())->v += (inc); \
- per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->v += (inc); \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->s.v += (inc); \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->s.v += (inc); \
+} while (0)
+
+#define XFS_STATS_INC_OFF(mp, off) \
+do { \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->a[off]++; \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->a[off]++; \
+} while (0)
+
+#define XFS_STATS_DEC_OFF(mp, off) \
+do { \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->a[off]; \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->a[off]; \
+} while (0)
+
+#define XFS_STATS_ADD_OFF(mp, off, inc) \
+do { \
+ per_cpu_ptr(xfsstats.xs_stats, current_cpu())->a[off] += (inc); \
+ per_cpu_ptr(mp->m_stats.xs_stats, current_cpu())->a[off] += (inc); \
} while (0)
#if defined(CONFIG_PROC_FS)