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Refactor packed_git to prepare for sliding mmap windows.

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The idea behind the sliding mmap window pack reader implementation
is to have multiple mmap regions active against the same pack file,
thereby allowing the process to mmap in only the active/hot sections
of the pack and reduce overall virtual address space usage.

To implement this we need to refactor the mmap related data
(pack_base, pack_use_cnt) out of struct packed_git and move them
into a new struct pack_window.

We are refactoring the code to support a single struct pack_window
per packfile, thereby emulating the prior behavior of mmap'ing the
entire pack file.

Signed-off-by: Shawn O. Pearce <spearce@spearce.org>
Signed-off-by: Junio C Hamano <junkio@cox.net>
This commit is contained in:
Shawn O. Pearce
2006-12-23 02:33:44 -05:00
committed by Junio C Hamano
parent 77ccc5bbd1
commit c41ee586dc
4 changed files with 40 additions and 34 deletions
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6
pack-check.c
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@@ -13,7 +13,8 @@ static int verify_packfile(struct packed_git *p)
int nr_objects, err, i;
/* Header consistency check */
hdr = p->pack_base;
pack_base = p->windows->base;
hdr = (struct pack_header*)pack_base;
if (hdr->hdr_signature != htonl(PACK_SIGNATURE))
return error("Packfile %s signature mismatch", p->pack_name);
if (!pack_version_ok(hdr->hdr_version))
@@ -26,7 +27,6 @@ static int verify_packfile(struct packed_git *p)
num_packed_objects(p));
SHA1_Init(&ctx);
pack_base = p->pack_base;
SHA1_Update(&ctx, pack_base, pack_size - 20);
SHA1_Final(sha1, &ctx);
if (hashcmp(sha1, (unsigned char *)pack_base + pack_size - 20))
@@ -78,7 +78,7 @@ static void show_pack_info(struct packed_git *p)
int nr_objects, i;
unsigned int chain_histogram[MAX_CHAIN];
hdr = p->pack_base;
hdr = (struct pack_header*)p->windows->base;
nr_objects = ntohl(hdr->hdr_entries);
memset(chain_histogram, 0, sizeof(chain_histogram));