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update-index: new options to enable/disable split index mode

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If you have a large work tree but only make changes in a subset, then
$GIT_DIR/index's size should be stable after a while. If you change
branches that touch something else, $GIT_DIR/index's size may grow
large that it becomes as slow as the unified index. Do --split-index
again occasionally to force all changes back to the shared index and
keep $GIT_DIR/index small.

Signed-off-by: Nguyễn Thái Ngọc Duy <pclouds@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Nguyễn Thái Ngọc Duy
2014-06-13 19:19:44 +07:00
committed by Junio C Hamano
parent b3c96fb158
commit c18b80a0e8
5 changed files with 114 additions and 6 deletions
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18
builtin/update-index.c
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@ -13,6 +13,7 @@
#include "parse-options.h"
#include "pathspec.h"
#include "dir.h"
#include "split-index.h"
/*
* Default to not allowing changes to the list of files. The
@ -742,6 +743,7 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
char set_executable_bit = 0;
struct refresh_params refresh_args = {0, &has_errors};
int lock_error = 0;
int split_index = -1;
struct lock_file *lock_file;
struct parse_opt_ctx_t ctx;
int parseopt_state = PARSE_OPT_UNKNOWN;
@ -824,6 +826,8 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
resolve_undo_clear_callback},
OPT_INTEGER(0, "index-version", &preferred_index_format,
N_("write index in this format")),
OPT_BOOL(0, "split-index", &split_index,
N_("enable or disable split index")),
OPT_END()
};
@ -917,6 +921,20 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
strbuf_release(&buf);
}
if (split_index > 0) {
init_split_index(&the_index);
the_index.cache_changed |= SPLIT_INDEX_ORDERED;
} else if (!split_index && the_index.split_index) {
/*
* can't discard_split_index(&the_index); because that
* will destroy split_index->base->cache[], which may
* be shared with the_index.cache[]. So yeah we're
* leaking a bit here.
*/
the_index.split_index = NULL;
the_index.cache_changed |= SOMETHING_CHANGED;
}
if (active_cache_changed) {
if (newfd < 0) {
if (refresh_args.flags & REFRESH_QUIET)