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builtin/checkout.c: complete parallel checkout support 

Pathspec-limited checkouts (like `git checkout *.txt`) are performed by
a code path that doesn't yet support parallel checkout because it calls
checkout_entry() directly, instead of unpack_trees(). Let's add parallel
checkout support for this code path too.

The transient cache entries allocated in checkout_merged() are now
allocated in a mem_pool which is only discarded after parallel checkout
finishes. This is done because the entries need to be valid when
run_parallel_checkout() is called.

Signed-off-by: Matheus Tavares <matheus.bernardino@usp.br>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Matheus Tavares 2021-05-04 13:27:29 -03:00 committed by Junio C Hamano
parent 9616882780
commit 6053950632
1 changed files with 17 additions and 4 deletions
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21
builtin/checkout.c
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@ -27,6 +27,7 @@
#include "wt-status.h"
#include "xdiff-interface.h"
#include "entry.h"
#include "parallel-checkout.h"
static const char * const checkout_usage[] = {
N_("git checkout [<options>] <branch>"),
@ -230,7 +231,8 @@ static int checkout_stage(int stage, const struct cache_entry *ce, int pos,
return error(_("path '%s' does not have their version"), ce->name);
}
static int checkout_merged(int pos, const struct checkout *state, int *nr_checkouts)
static int checkout_merged(int pos, const struct checkout *state,
int *nr_checkouts, struct mem_pool *ce_mem_pool)
{
struct cache_entry *ce = active_cache[pos];
const char *path = ce->name;
@ -291,11 +293,10 @@ static int checkout_merged(int pos, const struct checkout *state, int *nr_checko
if (write_object_file(result_buf.ptr, result_buf.size, blob_type, &oid))
die(_("Unable to add merge result for '%s'"), path);
free(result_buf.ptr);
ce = make_transient_cache_entry(mode, &oid, path, 2, NULL);
ce = make_transient_cache_entry(mode, &oid, path, 2, ce_mem_pool);
if (!ce)
die(_("make_cache_entry failed for path '%s'"), path);
status = checkout_entry(ce, state, NULL, nr_checkouts);
discard_cache_entry(ce);
return status;
}
@ -359,16 +360,23 @@ static int checkout_worktree(const struct checkout_opts *opts,
int nr_checkouts = 0, nr_unmerged = 0;
int errs = 0;
int pos;
int pc_workers, pc_threshold;
struct mem_pool ce_mem_pool;
state.force = 1;
state.refresh_cache = 1;
state.istate = &the_index;
mem_pool_init(&ce_mem_pool, 0);
get_parallel_checkout_configs(&pc_workers, &pc_threshold);
init_checkout_metadata(&state.meta, info->refname,
info->commit ? &info->commit->object.oid : &info->oid,
NULL);
enable_delayed_checkout(&state);
if (pc_workers > 1)
init_parallel_checkout();
for (pos = 0; pos < active_nr; pos++) {
struct cache_entry *ce = active_cache[pos];
if (ce->ce_flags & CE_MATCHED) {
@ -384,10 +392,15 @@ static int checkout_worktree(const struct checkout_opts *opts,
&nr_checkouts, opts->overlay_mode);
else if (opts->merge)
errs |= checkout_merged(pos, &state,
&nr_unmerged);
&nr_unmerged,
&ce_mem_pool);
pos = skip_same_name(ce, pos) - 1;
}
}
if (pc_workers > 1)
errs |= run_parallel_checkout(&state, pc_workers, pc_threshold,
NULL, NULL);
mem_pool_discard(&ce_mem_pool, should_validate_cache_entries());
remove_marked_cache_entries(&the_index, 1);
remove_scheduled_dirs();
errs |= finish_delayed_checkout(&state, &nr_checkouts);