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

Implement bitmap_ffu(), which finds the first unset bit.

Browse Source
This commit is contained in:
Jason Evans
2017-03-23 17:59:47 -07:00
parent a832ebaee9
commit c8021d01f6
6 changed files with 136 additions and 25 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
src/arena.c
View File

@@ -1210,7 +1210,7 @@ arena_slab_alloc(tsdn_t *tsdn, arena_t *arena, szind_t binind,
/* Initialize slab internals. */
arena_slab_data_t *slab_data = extent_slab_data_get(slab);
slab_data->nfree = bin_info->nregs;
bitmap_init(slab_data->bitmap, &bin_info->bitmap_info);
bitmap_init(slab_data->bitmap, &bin_info->bitmap_info, false);
arena_nactive_add(arena, extent_size_get(slab) >> LG_PAGE);

27
src/bitmap.c
View File

@@ -39,16 +39,26 @@ bitmap_info_ngroups(const bitmap_info_t *binfo) {
}
void
bitmap_init(bitmap_t *bitmap, const bitmap_info_t *binfo) {
bitmap_init(bitmap_t *bitmap, const bitmap_info_t *binfo, bool fill) {
size_t extra;
unsigned i;
/*
* Bits are actually inverted with regard to the external bitmap
* interface, so the bitmap starts out with all 1 bits, except for
* trailing unused bits (if any). Note that each group uses bit 0 to
* correspond to the first logical bit in the group, so extra bits
* are the most significant bits of the last group.
* interface.
*/
if (fill) {
/* The "filled" bitmap starts out with all 0 bits. */
memset(bitmap, 0, bitmap_size(binfo));
return;
}
/*
* The "empty" bitmap starts out with all 1 bits, except for trailing
* unused bits (if any). Note that each group uses bit 0 to correspond
* to the first logical bit in the group, so extra bits are the most
* significant bits of the last group.
*/
memset(bitmap, 0xffU, bitmap_size(binfo));
extra = (BITMAP_GROUP_NBITS - (binfo->nbits & BITMAP_GROUP_NBITS_MASK))
@@ -84,9 +94,14 @@ bitmap_info_ngroups(const bitmap_info_t *binfo) {
}
void
bitmap_init(bitmap_t *bitmap, const bitmap_info_t *binfo) {
bitmap_init(bitmap_t *bitmap, const bitmap_info_t *binfo, bool fill) {
size_t extra;
if (fill) {
memset(bitmap, 0, bitmap_size(binfo));
return;
}
memset(bitmap, 0xffU, bitmap_size(binfo));
extra = (BITMAP_GROUP_NBITS - (binfo->nbits & BITMAP_GROUP_NBITS_MASK))
& BITMAP_GROUP_NBITS_MASK;