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update-index: use the bulk-checkin infrastructure

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The update-index functionality is used internally by 'git stash push' to
setup the internal stashed commit.

This change enables odb-transactions for update-index infrastructure to
speed up adding new objects to the object database by leveraging the
batch fsync functionality.

There is some risk with this change, since under batch fsync, the object
files will be in a tmp-objdir until update-index is complete, so callers
using the --stdin option will not see them until update-index is done.
This risk is mitigated by flushing the ODB transaction prior to
reporting any verbose output so that objects will be visible to callers
that are synchronizing with update-index by snooping its output.

Signed-off-by: Neeraj Singh <neerajsi@microsoft.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Neeraj Singh 2022-04-04 22:20:12 -07:00 committed by Junio C Hamano
parent b4a0c6dc97
commit 23a3a303ab
1 changed files with 20 additions and 0 deletions
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20
builtin/update-index.c
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@ -5,6 +5,7 @@
*/
#define USE_THE_INDEX_COMPATIBILITY_MACROS
#include "cache.h"
#include "bulk-checkin.h"
#include "config.h"
#include "lockfile.h"
#include "quote.h"
@ -57,6 +58,14 @@ static void report(const char *fmt, ...)
if (!verbose)
return;
/*
* It is possible, though unlikely, that a caller could use the verbose
* output to synchronize with addition of objects to the object
* database. The current implementation of ODB transactions leaves
* objects invisible while a transaction is active, so flush the
* transaction here before reporting a change made by update-index.
*/
flush_odb_transaction();
va_start(vp, fmt);
vprintf(fmt, vp);
putchar('\n');
@ -1116,6 +1125,12 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
*/
parse_options_start(&ctx, argc, argv, prefix,
options, PARSE_OPT_STOP_AT_NON_OPTION);
/*
* Allow the object layer to optimize adding multiple objects in
* a batch.
*/
begin_odb_transaction();
while (ctx.argc) {
if (parseopt_state != PARSE_OPT_DONE)
parseopt_state = parse_options_step(&ctx, options,
@ -1190,6 +1205,11 @@ int cmd_update_index(int argc, const char **argv, const char *prefix)
strbuf_release(&buf);
}
/*
* By now we have added all of the new objects
*/
end_odb_transaction();
if (split_index > 0) {
if (git_config_get_split_index() == 0)
warning(_("core.splitIndex is set to false; "