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Update various comments.

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This commit is contained in:
Jason Evans 2010-12-17 18:07:53 -08:00
parent 2a6f2af6e4
commit 8ad0eacfb3
2 changed files with 40 additions and 49 deletions
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85
jemalloc/include/jemalloc/internal/arena.h
View File

@ -45,9 +45,10 @@
* point is implicitly RUN_BFP bits to the left. * point is implicitly RUN_BFP bits to the left.
* *
* Note that it is possible to set RUN_MAX_OVRHD low enough that it cannot be * Note that it is possible to set RUN_MAX_OVRHD low enough that it cannot be
* honored for some/all object sizes, since there is one bit of header overhead * honored for some/all object sizes, since when heap profiling is enabled
* per object (plus a constant). This constraint is relaxed (ignored) for runs * there is one pointer of header overhead per object (plus a constant). This
* that are so small that the per-region overhead is greater than: * constraint is relaxed (ignored) for runs that are so small that the
* per-region overhead is greater than:
* *
* (RUN_MAX_OVRHD / (reg_size << (3+RUN_BFP)) * (RUN_MAX_OVRHD / (reg_size << (3+RUN_BFP))
*/ */
@ -105,7 +106,7 @@ struct arena_chunk_map_s {
* Run address (or size) and various flags are stored together. The bit * Run address (or size) and various flags are stored together. The bit
* layout looks like (assuming 32-bit system): * layout looks like (assuming 32-bit system):
* *
* ???????? ???????? ????---- ----dzla * ???????? ???????? ????---- ----dula
* *
* ? : Unallocated: Run address for first/last pages, unset for internal * ? : Unallocated: Run address for first/last pages, unset for internal
* pages. * pages.
@ -113,7 +114,7 @@ struct arena_chunk_map_s {
* Large: Run size for first page, unset for trailing pages. * Large: Run size for first page, unset for trailing pages.
* - : Unused. * - : Unused.
* d : dirty? * d : dirty?
* z : zeroed? * u : unzeroed?
* l : large? * l : large?
* a : allocated? * a : allocated?
* *
@ -129,30 +130,30 @@ struct arena_chunk_map_s {
* [dula] : bit unset * [dula] : bit unset
* *
* Unallocated (clean): * Unallocated (clean):
* ssssssss ssssssss ssss---- ----du-- * ssssssss ssssssss ssss---- ----du-a
* xxxxxxxx xxxxxxxx xxxx---- -----Uxx * xxxxxxxx xxxxxxxx xxxx---- -----Uxx
* ssssssss ssssssss ssss---- ----dU-- * ssssssss ssssssss ssss---- ----dU-a
* *
* Unallocated (dirty): * Unallocated (dirty):
* ssssssss ssssssss ssss---- ----D--- * ssssssss ssssssss ssss---- ----D--a
* xxxxxxxx xxxxxxxx xxxx---- ----xxxx * xxxxxxxx xxxxxxxx xxxx---- ----xxxx
* ssssssss ssssssss ssss---- ----D--- * ssssssss ssssssss ssss---- ----D--a
* *
* Small: * Small:
* pppppppp pppppppp pppp---- ----d--a * pppppppp pppppppp pppp---- ----d--A
* pppppppp pppppppp pppp---- -------a * pppppppp pppppppp pppp---- -------A
* pppppppp pppppppp pppp---- ----d--a * pppppppp pppppppp pppp---- ----d--A
* *
* Large: * Large:
* ssssssss ssssssss ssss---- ----D-la * ssssssss ssssssss ssss---- ----D-LA
* xxxxxxxx xxxxxxxx xxxx---- ----xxxx * xxxxxxxx xxxxxxxx xxxx---- ----xxxx
* -------- -------- -------- ----D-la * -------- -------- -------- ----D-LA
* *
* Large (sampled, size <= PAGE_SIZE): * Large (sampled, size <= PAGE_SIZE):
* ssssssss ssssssss sssscccc ccccD-la * ssssssss ssssssss sssscccc ccccD-LA
* *
* Large (not sampled, size == PAGE_SIZE): * Large (not sampled, size == PAGE_SIZE):
* ssssssss ssssssss ssss---- ----D-la * ssssssss ssssssss ssss---- ----D-LA
*/ */
size_t bits; size_t bits;
#ifdef JEMALLOC_PROF #ifdef JEMALLOC_PROF
@ -347,45 +348,35 @@ struct arena_s {
/* /*
* bins is used to store trees of free regions of the following sizes, * bins is used to store trees of free regions of the following sizes,
* assuming a 16-byte quantum, 4 KiB page size, and default * assuming a 64-bit system with 16-byte quantum, 4 KiB page size, and
* JEMALLOC_OPTIONS. * default MALLOC_CONF.
* *
* bins[i] | size | * bins[i] | size |
* --------+--------+ * --------+--------+
* 0 | 2 | * 0 | 8 |
* 1 | 4 |
* 2 | 8 |
* --------+--------+ * --------+--------+
* 3 | 16 | * 1 | 16 |
* 4 | 32 | * 2 | 32 |
* 5 | 48 | * 3 | 48 |
* : : * : :
* 8 | 96 | * 6 | 96 |
* 9 | 112 | * 7 | 112 |
* 10 | 128 | * 8 | 128 |
* --------+--------+ * --------+--------+
* 11 | 192 | * 9 | 192 |
* 12 | 256 | * 10 | 256 |
* 13 | 320 | * 11 | 320 |
* 14 | 384 | * 12 | 384 |
* 15 | 448 | * 13 | 448 |
* 16 | 512 | * 14 | 512 |
* --------+--------+ * --------+--------+
* 17 | 768 | * 15 | 768 |
* 18 | 1024 | * 16 | 1024 |
* 19 | 1280 | * 17 | 1280 |
* : : * : :
* 27 | 3328 | * 25 | 3328 |
* 28 | 3584 | * 26 | 3584 |
* 29 | 3840 | * 27 | 3840 |
* --------+--------+
* 30 | 4 KiB |
* 31 | 6 KiB |
* 33 | 8 KiB |
* : :
* 43 | 28 KiB |
* 44 | 30 KiB |
* 45 | 32 KiB |
* --------+--------+ * --------+--------+
*/ */
arena_bin_t bins[1]; /* Dynamically sized. */ arena_bin_t bins[1]; /* Dynamically sized. */

4
jemalloc/src/jemalloc.c
View File

@ -421,8 +421,8 @@ malloc_conf_init(void)
if ((opts = getenv(envname)) != NULL) { if ((opts = getenv(envname)) != NULL) {
/* /*
* Do nothing; opts is already initialized to * Do nothing; opts is already initialized to
* the value of the JEMALLOC_OPTIONS * the value of the MALLOC_CONF environment
* environment variable. * variable.
*/ */
} else { } else {
/* No configuration specified. */ /* No configuration specified. */