project-base/server-skynet-source-3rd-jemalloc
2
0
Fork 0
Code Issues Pull Requests Packages Projects Releases Wiki Activity

Bypass extent_alloc_wrapper_hard for no_move_expand.

Browse Source 
When retain is enabled, we should not attempt mmap for in-place expansion
(large_ralloc_no_move), because it's virtually impossible to succeed, and causes
unnecessary syscalls (which can cause lock contention under load).
This commit is contained in:
Qi Wang 2017-07-31 13:01:07 -07:00 committed by Qi Wang
parent 2d2fa72647
commit 3800e55a2c
1 changed files with 9 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
src/extent.c
View File

@ -1296,6 +1296,15 @@ extent_alloc_wrapper(tsdn_t *tsdn, arena_t *arena,
extent_t *extent = extent_alloc_retained(tsdn, arena, r_extent_hooks, extent_t *extent = extent_alloc_retained(tsdn, arena, r_extent_hooks,
new_addr, size, pad, alignment, slab, szind, zero, commit); new_addr, size, pad, alignment, slab, szind, zero, commit);
if (extent == NULL) { if (extent == NULL) {
if (opt_retain && new_addr != NULL) {
/*
* When retain is enabled and new_addr is set, we do not
* attempt extent_alloc_wrapper_hard which does mmap
* that is very unlikely to succeed (unless it happens
* to be at the end).
*/
return NULL;
}
extent = extent_alloc_wrapper_hard(tsdn, arena, r_extent_hooks, extent = extent_alloc_wrapper_hard(tsdn, arena, r_extent_hooks,
new_addr, size, pad, alignment, slab, szind, zero, commit); new_addr, size, pad, alignment, slab, szind, zero, commit);
} }