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perf map: Remove ->groups from 'struct map' 

With this 'struct map' uses a bit over 3 cachelines:

  $ pahole -C map ~/bin/perf
  <SNIP>
  	/* --- cacheline 2 boundary (128 bytes) --- */
  	u64                        (*unmap_ip)(struct map *, u64); /*   128     8 */
  	struct dso *               dso;                            /*   136     8 */
  	refcount_t                 refcnt;                         /*   144     4 */

  	/* size: 152, cachelines: 3, members: 18 */
  	/* sum members: 145, holes: 1, sum holes: 3 */
  	/* padding: 4 */
  	/* forced alignments: 2 */
  	/* last cacheline: 24 bytes */
  } __attribute__((__aligned__(8)));
  $

We probably can move map->map/unmap_ip() moved to 'struct map_groups',
that will shave more 16 bytes, getting this almost to two cachelines.

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Andi Kleen <ak@linux.intel.com>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Namhyung Kim <namhyung@kernel.org>
Link: https://lkml.kernel.org/n/tip-ymlv3nzpofv2fugnjnizkrwy@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Arnaldo Carvalho de Melo 2019-11-04 16:55:53 -03:00
parent 3f662fc08d
commit 7b018e2987
2 changed files with 0 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
tools/perf/util/map.c
View File

@ -140,7 +140,6 @@ void map__init(struct map *map, u64 start, u64 end, u64 pgoff, struct dso *dso)
map->map_ip = map__map_ip;
map->unmap_ip = map__unmap_ip;
RB_CLEAR_NODE(&map->rb_node);
map->groups = NULL;
map->erange_warned = false;
refcount_set(&map->refcnt, 1);
}
@ -388,7 +387,6 @@ struct map *map__clone(struct map *from)
refcount_set(&map->refcnt, 1);
RB_CLEAR_NODE(&map->rb_node);
dso__get(map->dso);
map->groups = NULL;
}
return map;
@ -582,7 +580,6 @@ void map_groups__init(struct map_groups *mg, struct machine *machine)
void map_groups__insert(struct map_groups *mg, struct map *map)
{
maps__insert(&mg->maps, map);
map->groups = mg;
}
static void __maps__purge(struct maps *maps)
@ -749,7 +746,6 @@ static void __map_groups__insert(struct map_groups *mg, struct map *map)
{
__maps__insert(&mg->maps, map);
__maps__insert_name(&mg->maps, map);
map->groups = mg;
}
int map_groups__fixup_overlappings(struct map_groups *mg, struct map *map, FILE *fp)

1
tools/perf/util/map.h
View File

@ -42,7 +42,6 @@ struct map {
u64 (*unmap_ip)(struct map *, u64);
struct dso *dso;
struct map_groups *groups;
refcount_t refcnt;
};