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sha1_file.c: Round the mmap offset to half the window size.

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This ensures that a given area is mapped at most twice, and greatly
reduces the virtual address space usage.

Signed-off-by: Alexandre Julliard <julliard@winehq.org>
Acked-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Alexandre Julliard 2007-02-14 18:11:40 +01:00 committed by Junio C Hamano
parent 5faaf24634
commit 78a28df938
1 changed files with 3 additions and 5 deletions
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8
sha1_file.c
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@ -407,7 +407,6 @@ static unsigned int peak_pack_open_windows;
static unsigned int pack_open_windows;
static size_t peak_pack_mapped;
static size_t pack_mapped;
static size_t page_size;
struct packed_git *packed_git;
void pack_report()
@ -416,7 +415,7 @@ void pack_report()
"pack_report: getpagesize() = %10" SZ_FMT "\n"
"pack_report: core.packedGitWindowSize = %10" SZ_FMT "\n"
"pack_report: core.packedGitLimit = %10" SZ_FMT "\n",
page_size,
(size_t) getpagesize(),
packed_git_window_size,
packed_git_limit);
fprintf(stderr,
@ -662,10 +661,9 @@ unsigned char* use_pack(struct packed_git *p,
break;
}
if (!win) {
if (!page_size)
page_size = getpagesize();
size_t window_align = packed_git_window_size / 2;
win = xcalloc(1, sizeof(*win));
win->offset = (offset / page_size) * page_size;
win->offset = (offset / window_align) * window_align;
win->len = p->pack_size - win->offset;
if (win->len > packed_git_window_size)
win->len = packed_git_window_size;