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| author | Jason Evans <jasone@canonware.com> | 2014-10-11 06:01:03 (GMT) |
|---|---|---|
| committer | Jason Evans <jasone@canonware.com> | 2014-10-11 06:01:03 (GMT) |
| commit | 381c23dd9d3bf019cc4c7523a900be1e888802a7 (patch) | |
| tree | 476e6da4c0dfd837779f7cc4979962e5e55a6d03 /include | |
| parent | 81e547566e9bd55db7c317c5848ab9dc189047cb (diff) | |
| download | jemalloc-381c23dd9d3bf019cc4c7523a900be1e888802a7.zip jemalloc-381c23dd9d3bf019cc4c7523a900be1e888802a7.tar.gz jemalloc-381c23dd9d3bf019cc4c7523a900be1e888802a7.tar.bz2 | |
Remove arena_dalloc_bin_run() clean page preservation.
Remove code in arena_dalloc_bin_run() that preserved the "clean" state
of trailing clean pages by splitting them into a separate run during
deallocation. This was a useful mechanism for reducing dirty page
churn when bin runs comprised many pages, but bin runs are now quite
small.
Remove the nextind field from arena_run_t now that it is no longer
needed, and change arena_run_t's bin field (arena_bin_t *) to binind
(index_t). These two changes remove 8 bytes of chunk header overhead
per page, which saves 1/512 of all arena chunk memory.
Diffstat (limited to 'include')
| -rw-r--r-- | include/jemalloc/internal/arena.h | 14 |
1 files changed, 6 insertions, 8 deletions
diff --git a/include/jemalloc/internal/arena.h b/include/jemalloc/internal/arena.h index f5b9fc6..28ff727 100644 --- a/include/jemalloc/internal/arena.h +++ b/include/jemalloc/internal/arena.h @@ -36,11 +36,8 @@ typedef struct arena_s arena_t; #ifdef JEMALLOC_H_STRUCTS struct arena_run_s { - /* Bin this run is associated with. */ - arena_bin_t *bin; - - /* Index of next region that has never been allocated, or nregs. */ - uint32_t nextind; + /* Index of bin this run is associated with. */ + index_t binind; /* Number of free regions in run. */ unsigned nfree; @@ -756,7 +753,7 @@ arena_ptr_small_binind_get(const void *ptr, size_t mapbits) size_t rpages_ind; arena_run_t *run; arena_bin_t *bin; - index_t actual_binind; + index_t run_binind, actual_binind; arena_bin_info_t *bin_info; arena_chunk_map_misc_t *miscelm; void *rpages; @@ -774,9 +771,10 @@ arena_ptr_small_binind_get(const void *ptr, size_t mapbits) pageind); miscelm = arena_miscelm_get(chunk, rpages_ind); run = &miscelm->run; - bin = run->bin; + run_binind = run->binind; + bin = &arena->bins[run_binind]; actual_binind = bin - arena->bins; - assert(binind == actual_binind); + assert(run_binind == actual_binind); bin_info = &arena_bin_info[actual_binind]; rpages = arena_miscelm_to_rpages(miscelm); assert(((uintptr_t)ptr - ((uintptr_t)rpages + |