Date: Mon, 2 Nov 2009 18:44:01 +0000 (UTC) From: Alan Cox <alc@FreeBSD.org> To: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-stable@freebsd.org, svn-src-stable-8@freebsd.org Subject: svn commit: r198815 - stable/8/lib/libc/stdlib Message-ID: <200911021844.nA2Ii2br066253@svn.freebsd.org>
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Author: alc Date: Mon Nov 2 18:44:01 2009 New Revision: 198815 URL: http://svn.freebsd.org/changeset/base/198815 Log: MFC r197524 Make malloc(3) superpage aware. Modified: stable/8/lib/libc/stdlib/ (props changed) stable/8/lib/libc/stdlib/malloc.3 stable/8/lib/libc/stdlib/malloc.c Modified: stable/8/lib/libc/stdlib/malloc.3 ============================================================================== --- stable/8/lib/libc/stdlib/malloc.3 Mon Nov 2 18:35:05 2009 (r198814) +++ stable/8/lib/libc/stdlib/malloc.3 Mon Nov 2 18:44:01 2009 (r198815) @@ -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 Modified: stable/8/lib/libc/stdlib/malloc.c ============================================================================== --- stable/8/lib/libc/stdlib/malloc.c Mon Nov 2 18:35:05 2009 (r198814) +++ stable/8/lib/libc/stdlib/malloc.c Mon Nov 2 18:44:01 2009 (r198815) @@ -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;
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