diff options
Diffstat (limited to 'lib/libc')
| -rw-r--r-- | lib/libc/stdlib/malloc.3 | 6 | ||||
| -rw-r--r-- | lib/libc/stdlib/malloc.c | 15 |
2 files changed, 19 insertions, 2 deletions
diff --git a/lib/libc/stdlib/malloc.3 b/lib/libc/stdlib/malloc.3 index a621a24..308ba7b 100644 --- a/lib/libc/stdlib/malloc.3 +++ b/lib/libc/stdlib/malloc.3 @@ -32,7 +32,7 @@ .\" @(#)malloc.3 8.1 (Berkeley) 6/4/93 .\" $FreeBSD$ .\" -.Dd August 26, 2008 +.Dd September 26, 2009 .Dt MALLOC 3 .Os .Sh NAME @@ -245,7 +245,8 @@ will be initialized to 0x5a. This is intended for debugging and will impact performance negatively. .It K Double/halve the virtual memory chunk size. -The default chunk size is 1 MB. +The default chunk size is the maximum of 1 MB and the largest +page size that is less than or equal to 4 MB. .It M Use .Xr mmap 2 @@ -561,6 +562,7 @@ _malloc_options = "X"; .Xr alloca 3 , .Xr atexit 3 , .Xr getpagesize 3 , +.Xr getpagesizes 3 , .Xr memory 3 , .Xr posix_memalign 3 .Sh STANDARDS diff --git a/lib/libc/stdlib/malloc.c b/lib/libc/stdlib/malloc.c index b56b003..bdc26b6 100644 --- a/lib/libc/stdlib/malloc.c +++ b/lib/libc/stdlib/malloc.c @@ -4795,6 +4795,21 @@ malloc_init_hard(void) } } + /* + * Increase the chunk size to the largest page size that is greater + * than the default chunk size and less than or equal to 4MB. + */ + { + size_t pagesizes[MAXPAGESIZES]; + int k, nsizes; + + nsizes = getpagesizes(pagesizes, MAXPAGESIZES); + for (k = 0; k < nsizes; k++) + if (pagesizes[k] <= (1LU << 22)) + while ((1LU << opt_chunk_2pow) < pagesizes[k]) + opt_chunk_2pow++; + } + for (i = 0; i < 3; i++) { unsigned j; |
