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Diffstat (limited to 'gcc-4.9/gcc/profile.h')
| -rw-r--r-- | gcc-4.9/gcc/profile.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc-4.9/gcc/profile.h b/gcc-4.9/gcc/profile.h index be609c746..b50824ff6 100644 --- a/gcc-4.9/gcc/profile.h +++ b/gcc-4.9/gcc/profile.h @@ -46,7 +46,15 @@ extern gcov_type sum_edge_counts (vec<edge, va_gc> *edges); extern void init_node_map (bool); extern void del_node_map (void); +/* Implement sampling to avoid writing to edge counters very often. + Many concurrent writes to the same counters, or to counters that share + the same cache line leads to up to 30x slowdown on an application running + on 8 CPUs. With sampling, the slowdown reduced to 2x. */ +extern void add_sampling_to_edge_counters (void); + +extern void compute_working_sets (void); extern void get_working_sets (void); +extern void add_working_set (gcov_working_set_t *); /* In predict.c. */ extern gcov_type get_hot_bb_threshold (void); |