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| author | Rong Xu <xur@google.com> | 2014-07-21 16:47:22 -0700 |
|---|---|---|
| committer | Rong Xu <xur@google.com> | 2014-07-29 15:31:03 -0700 |
| commit | 38a8aecfb882072900434499696b5c32a2274515 (patch) | |
| tree | 2aac97f0ae24b03cd98c1a06e989c031c173f889 /gcc-4.9/gcc/profile.h | |
| parent | c231900e5dcc14d8296bd9f62b45997a49d4d5e7 (diff) | |
| download | toolchain_gcc-38a8aecfb882072900434499696b5c32a2274515.tar.gz toolchain_gcc-38a8aecfb882072900434499696b5c32a2274515.tar.bz2 toolchain_gcc-38a8aecfb882072900434499696b5c32a2274515.zip | |
[4.9] Switch gcc-4.9 to use google/gcc-4_9 branch.
This source drop uses svn version r212828 of google/gcc-4.9 branch.
We also cherry-picked r213062, r213063 and r213064 to fix windows
build issues.
All gcc-4.9 patches before July 3rd are ported to google/gcc-4.9.
The following prior commits has not been merged to google branch yet.
(They are included in this commit).
e7af147f979e657fe2df00808e5b4319b0e088c6,
baf87df3cb2683649ba7e9872362a7e721117c23, and
c231900e5dcc14d8296bd9f62b45997a49d4d5e7.
Change-Id: I4bea3ea470387ff751c2be4cb0d4a12059b9299b
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); |