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Remove opt_dss and opt_mmap, such that if DSS allocation is enabled, both DSS

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and heap allocation are always enabled.
This commit is contained in:
Jason Evans 2009-12-29 00:09:15 -08:00
parent 5463a5298d
commit 6d7bb5357a
2 changed files with 20 additions and 92 deletions
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29
jemalloc/doc/jemalloc.3.in
View File

@ -193,14 +193,6 @@ Double/halve the size of the maximum size class that is a multiple of the
cacheline size (64).
Above this size, subpage spacing (256 bytes) is used for size classes.
The default value is 512 bytes.
@roff_dss@.It D
@roff_dss@Use
@roff_dss@.Xr sbrk 2
@roff_dss@to acquire memory in the data storage segment (DSS).
@roff_dss@This option is enabled by default.
@roff_dss@See the
@roff_dss@.Dq M
@roff_dss@option for related information and interactions.
.It F
Double/halve the per-arena maximum number of dirty unused pages that are
allowed to accumulate before informing the kernel about at least half of those
@ -237,22 +229,6 @@ will prevent any dirty unused pages from accumulating.
.It K
Double/halve the virtual memory chunk size.
The default chunk size is 1 MB.
@roff_dss@.It M
@roff_dss@Use
@roff_dss@.Xr mmap 2
@roff_dss@to acquire anonymously mapped memory.
@roff_dss@This option is enabled by default.
@roff_dss@If both the
@roff_dss@.Dq D
@roff_dss@and
@roff_dss@.Dq M
@roff_dss@options are enabled, the allocator prefers the DSS over anonymous
@roff_dss@mappings, but allocation only fails if memory cannot be acquired via
@roff_dss@either method.
@roff_dss@If neither option is enabled, then the
@roff_dss@.Dq M
@roff_dss@option is implicitly enabled in order to assure that there is a method
@roff_dss@for acquiring memory.
.It N
Double/halve the number of arenas.
The default number of arenas is two times the number of CPUs, or one if there
@ -342,9 +318,8 @@ The default value is 128 bytes.
@roff_dss@This allocator uses both
@roff_dss@.Xr sbrk 2
@roff_dss@and
@roff_dss@.Xr mmap 2
@roff_dss@by default, but it can be configured at run time to use only one or
@roff_dss@the other.
@roff_dss@.Xr mmap 2 ,
@roff_dss@in that order of preference.
.Pp
This allocator uses multiple arenas in order to reduce lock contention for
threaded programs on multi-processor systems.

51
jemalloc/src/jemalloc.c
View File

@ -1020,10 +1020,6 @@ static bool opt_abort = false;
static bool opt_junk = false;
# endif
#endif
#ifdef JEMALLOC_DSS
static bool opt_dss = true;
static bool opt_mmap = true;
#endif
#ifdef JEMALLOC_MAG
static bool opt_mag = true;
static size_t opt_mag_size_2pow = MAG_SIZE_2POW_DEFAULT;
@ -1471,12 +1467,10 @@ base_pages_alloc(size_t minsize)
{
#ifdef JEMALLOC_DSS
if (opt_dss) {
if (base_pages_alloc_dss(minsize) == false)
return (false);
}
if (opt_mmap && minsize != 0)
if (minsize != 0)
#endif
{
if (base_pages_alloc_mmap(minsize) == false)
@ -1943,7 +1937,6 @@ chunk_alloc(size_t size, bool zero)
assert((size & chunksize_mask) == 0);
#ifdef JEMALLOC_DSS
if (opt_dss) {
ret = chunk_recycle_dss(size, zero);
if (ret != NULL) {
goto RETURN;
@ -1952,15 +1945,11 @@ chunk_alloc(size_t size, bool zero)
ret = chunk_alloc_dss(size);
if (ret != NULL)
goto RETURN;
}
if (opt_mmap)
#endif
{
ret = chunk_alloc_mmap(size);
if (ret != NULL)
goto RETURN;
}
/* All strategies for allocation failed. */
ret = NULL;
@ -2108,12 +2097,9 @@ chunk_dealloc(void *chunk, size_t size)
#endif
#ifdef JEMALLOC_DSS
if (opt_dss) {
if (chunk_dealloc_dss(chunk, size) == false)
return;
}
if (opt_mmap)
#endif
chunk_dealloc_mmap(chunk, size);
}
@ -4455,7 +4441,7 @@ huge_dalloc(void *ptr)
/* Unmap chunk. */
#ifdef JEMALLOC_FILL
#ifdef JEMALLOC_DSS
if (opt_dss && opt_junk)
if (opt_junk)
memset(node->addr, 0x5a, node->size);
#endif
#endif
@ -4696,17 +4682,11 @@ malloc_print_stats(void)
"\n", "");
malloc_message("Boolean JEMALLOC_OPTIONS: ",
opt_abort ? "A" : "a", "", "");
#ifdef JEMALLOC_DSS
malloc_message(opt_dss ? "D" : "d", "", "", "");
#endif
#ifdef JEMALLOC_MAG
malloc_message(opt_mag ? "G" : "g", "", "", "");
#endif
#ifdef JEMALLOC_FILL
malloc_message(opt_junk ? "J" : "j", "", "", "");
#endif
#ifdef JEMALLOC_DSS
malloc_message(opt_mmap ? "M" : "m", "", "", "");
#endif
malloc_message("P", "", "", "");
#ifdef JEMALLOC_TRACE
@ -5110,16 +5090,6 @@ MALLOC_OUT:
- 1)
opt_cspace_max_2pow++;
break;
case 'd':
#ifdef JEMALLOC_DSS
opt_dss = false;
#endif
break;
case 'D':
#ifdef JEMALLOC_DSS
opt_dss = true;
#endif
break;
case 'f':
opt_dirty_max >>= 1;
break;
@ -5159,16 +5129,6 @@ MALLOC_OUT:
(sizeof(size_t) << 3))
opt_chunk_2pow++;
break;
case 'm':
#ifdef JEMALLOC_DSS
opt_mmap = false;
#endif
break;
case 'M':
#ifdef JEMALLOC_DSS
opt_mmap = true;
#endif
break;
case 'n':
opt_narenas_lshift--;
break;
@ -5253,12 +5213,6 @@ MALLOC_OUT:
}
}
#ifdef JEMALLOC_DSS
/* Make sure that there is some method for acquiring memory. */
if (opt_dss == false && opt_mmap == false)
opt_mmap = true;
#endif
#ifdef JEMALLOC_TRACE
if (opt_trace) {
malloc_mutex_init(&trace_mtx);
@ -5379,7 +5333,6 @@ MALLOC_OUT:
* chunk-aligned. Doing this before allocating any other chunks allows
* the use of space that would otherwise be wasted.
*/
if (opt_dss)
base_pages_alloc(0);
#endif
base_nodes = NULL;