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Subject: [PATCH v9 0/6] submodule: parallelize diff
From: Calvin Wan <calvinwan@google.com>
To: git@vger.kernel.org
Cc: Calvin Wan <calvinwan@google.com>, avarab@gmail.com,
chooglen@google.com, newren@gmail.com, jonathantanmy@google.com,
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submodule: parallelize diff
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Original cover letter for context: https://lore.kernel.org/git/20221011232604.839941-1-calvinwan@google.com/ I appreciate all the reviewers that have stuck through this entire series! Hoping this can be the final reroll as I believe I've addressed all feedback and personally am happy with the state of the patches. Changes from v8 - renamed duplicate_output_fn to on_stderr_output_fn - renamed diff_change_helper() to record_file_diff() and added comments - reworded commit message for patch 5 - removed the refactoring of match_stat_with_submodule() - inlined parse_status_porcelain_strbuf() - fixed stylistic nits and cleaned up unnecessary variables and logic Calvin Wan (6): run-command: add on_stderr_output_fn to run_processes_parallel_opts submodule: rename strbuf variable submodule: move status parsing into function submodule: refactor is_submodule_modified() diff-lib: refactor out diff_change logic diff-lib: parallelize run_diff_files for submodules Documentation/config/submodule.txt | 12 ++ diff-lib.c | 123 +++++++++++--- run-command.c | 16 +- run-command.h | 25 +++ submodule.c | 254 +++++++++++++++++++++++------ submodule.h | 9 + t/helper/test-run-command.c | 20 +++ t/t0061-run-command.sh | 39 +++++ t/t4027-diff-submodule.sh | 31 ++++ t/t7506-status-submodule.sh | 25 +++ 10 files changed, 478 insertions(+), 76 deletions(-) Range-diff against v8: 1: 5d51250c67 ! 1: 49749ae3a5 run-command: add duplicate_output_fn to run_processes_parallel_opts @@ Metadata Author: Calvin Wan <calvinwan@google.com> ## Commit message ## - run-command: add duplicate_output_fn to run_processes_parallel_opts + run-command: add on_stderr_output_fn to run_processes_parallel_opts ## run-command.c ## @@ run-command.c: static void pp_init(struct parallel_processes *pp, @@ run-command.c: static void pp_init(struct parallel_processes *pp, BUG("you need to specify a get_next_task function"); + if (opts->ungroup) { -+ if (opts->duplicate_output) -+ BUG("duplicate_output and ungroup are incompatible with each other"); ++ if (opts->on_stderr_output) ++ BUG("on_stderr_output and ungroup are incompatible with each other"); + } + CALLOC_ARRAY(pp->children, n); @@ run-command.c: static void pp_buffer_stderr(struct parallel_processes *pp, + } else if (n < 0) { if (errno != EAGAIN) die_errno("read"); -+ } else if (opts->duplicate_output) { -+ opts->duplicate_output(&pp->children[i].err, ++ } else if (opts->on_stderr_output) { ++ opts->on_stderr_output(&pp->children[i].err, + pp->children[i].err.len - n, + opts->data, pp->children[i].data); + } @@ run-command.h: typedef int (*start_failure_fn)(struct strbuf *out, +/** + * This callback is called whenever output from a child process is buffered -+ * ++ * + * See run_processes_parallel() below for a discussion of the "struct + * strbuf *out" parameter. -+ * ++ * + * The offset refers to the number of bytes originally in "out" before + * the output from the child process was buffered. Therefore, the buffer + * range, "out + buf" to the end of "out", would contain the buffer of @@ run-command.h: typedef int (*start_failure_fn)(struct strbuf *out, + * + * This function is incompatible with "ungroup" + */ -+typedef void (*duplicate_output_fn)(struct strbuf *out, size_t offset, ++typedef void (*on_stderr_output_fn)(struct strbuf *out, size_t offset, + void *pp_cb, void *pp_task_cb); + /** @@ run-command.h: struct run_process_parallel_opts start_failure_fn start_failure; + /** -+ * duplicate_output: See duplicate_output_fn() above. Unless you need ++ * on_stderr_output: See on_stderr_output_fn() above. Unless you need + * to capture output from child processes, leave this as NULL. + */ -+ duplicate_output_fn duplicate_output; ++ on_stderr_output_fn on_stderr_output; + /** * task_finished: See task_finished_fn() above. This can be @@ t/helper/test-run-command.c: static int no_job(struct child_process *cp, return 0; } -+static void duplicate_output(struct strbuf *out, ++static void on_stderr_output(struct strbuf *out, + size_t offset, + void *pp_cb UNUSED, + void *pp_task_cb UNUSED) @@ t/helper/test-run-command.c: static int no_job(struct child_process *cp, + + string_list_split(&list, out->buf + offset, '\n', -1); + for_each_string_list_item(item, &list) -+ fprintf(stderr, "duplicate_output: %s\n", item->string); ++ fprintf(stderr, "on_stderr_output: %s\n", item->string); + string_list_clear(&list, 0); +} + @@ t/helper/test-run-command.c: int cmd__run_command(int argc, const char **argv) opts.ungroup = 1; } -+ if (!strcmp(argv[1], "--duplicate-output")) { ++ if (!strcmp(argv[1], "--on-stderr-output")) { + argv += 1; + argc -= 1; -+ opts.duplicate_output = duplicate_output; ++ opts.on_stderr_output = on_stderr_output; + } + jobs = atoi(argv[2]); @@ t/t0061-run-command.sh: test_expect_success 'run_command runs in parallel with m test_cmp expect actual ' -+test_expect_success 'run_command runs in parallel with more jobs available than tasks --duplicate-output' ' -+ test-tool run-command --duplicate-output run-command-parallel 5 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err && ++test_expect_success 'run_command runs in parallel with more jobs available than tasks --on-stderr-output' ' ++ test-tool run-command --on-stderr-output run-command-parallel 5 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err && + test_must_be_empty out && -+ test 4 = $(grep -c "duplicate_output: Hello" err) && -+ test 4 = $(grep -c "duplicate_output: World" err) && -+ sed "/duplicate_output/d" err >err1 && ++ test 4 = $(grep -c "on_stderr_output: Hello" err) && ++ test 4 = $(grep -c "on_stderr_output: World" err) && ++ sed "/on_stderr_output/d" err >err1 && + test_cmp expect err1 +' + @@ t/t0061-run-command.sh: test_expect_success 'run_command runs in parallel with a test_cmp expect actual ' -+test_expect_success 'run_command runs in parallel with as many jobs as tasks --duplicate-output' ' -+ test-tool run-command --duplicate-output run-command-parallel 4 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err && ++test_expect_success 'run_command runs in parallel with as many jobs as tasks --on-stderr-output' ' ++ test-tool run-command --on-stderr-output run-command-parallel 4 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err && + test_must_be_empty out && -+ test 4 = $(grep -c "duplicate_output: Hello" err) && -+ test 4 = $(grep -c "duplicate_output: World" err) && -+ sed "/duplicate_output/d" err >err1 && ++ test 4 = $(grep -c "on_stderr_output: Hello" err) && ++ test 4 = $(grep -c "on_stderr_output: World" err) && ++ sed "/on_stderr_output/d" err >err1 && + test_cmp expect err1 +' + @@ t/t0061-run-command.sh: test_expect_success 'run_command runs in parallel with m test_cmp expect actual ' -+test_expect_success 'run_command runs in parallel with more tasks than jobs available --duplicate-output' ' -+ test-tool run-command --duplicate-output run-command-parallel 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err && ++test_expect_success 'run_command runs in parallel with more tasks than jobs available --on-stderr-output' ' ++ test-tool run-command --on-stderr-output run-command-parallel 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err && + test_must_be_empty out && -+ test 4 = $(grep -c "duplicate_output: Hello" err) && -+ test 4 = $(grep -c "duplicate_output: World" err) && -+ sed "/duplicate_output/d" err >err1 && ++ test 4 = $(grep -c "on_stderr_output: Hello" err) && ++ test 4 = $(grep -c "on_stderr_output: World" err) && ++ sed "/on_stderr_output/d" err >err1 && + test_cmp expect err1 +' + @@ t/t0061-run-command.sh: test_expect_success 'run_command is asked to abort grace test_cmp expect actual ' -+test_expect_success 'run_command is asked to abort gracefully --duplicate-output' ' -+ test-tool run-command --duplicate-output run-command-abort 3 false >out 2>err && ++test_expect_success 'run_command is asked to abort gracefully --on-stderr-output' ' ++ test-tool run-command --on-stderr-output run-command-abort 3 false >out 2>err && + test_must_be_empty out && + test_cmp expect err +' @@ t/t0061-run-command.sh: test_expect_success 'run_command outputs ' ' test_cmp expect actual ' -+test_expect_success 'run_command outputs --duplicate-output' ' -+ test-tool run-command --duplicate-output run-command-no-jobs 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err && ++test_expect_success 'run_command outputs --on-stderr-output' ' ++ test-tool run-command --on-stderr-output run-command-no-jobs 3 sh -c "printf \"%s\n%s\n\" Hello World" >out 2>err && + test_must_be_empty out && + test_cmp expect err +' 2: 6ded5b6788 ! 2: 6c62e670f9 submodule: strbuf variable rename @@ Metadata Author: Calvin Wan <calvinwan@google.com> ## Commit message ## - submodule: strbuf variable rename + submodule: rename strbuf variable ## submodule.c ## @@ submodule.c: unsigned is_submodule_modified(const char *path, int ignore_untracked) 3: 0c71cea8cd = 3: 24e02f2a24 submodule: move status parsing into function 4: 5c8cc93f9f = 4: 86c1f734a0 submodule: refactor is_submodule_modified() 5: 6c2b62abc8 ! 5: 811a1fee55 diff-lib: refactor out diff_change logic @@ diff-lib.c: static int match_stat_with_submodule(struct diff_options *diffopt, return changed; } -+static int diff_change_helper(struct diff_options *options, -+ unsigned newmode, unsigned dirty_submodule, -+ int changed, struct index_state *istate, -+ struct cache_entry *ce) ++/** ++ * Records diff_change if there is a change in the entry from run_diff_files. ++ * If there is no change, then the cache entry is marked CE_UPTODATE and ++ * CE_FSMONITOR_VALID. If there is no change and the find_copies_harder flag ++ * is not set, then the function returns early. ++ */ ++static void record_file_diff(struct diff_options *options, unsigned newmode, ++ unsigned dirty_submodule, int changed, ++ struct index_state *istate, ++ struct cache_entry *ce) +{ + unsigned int oldmode; + const struct object_id *old_oid, *new_oid; @@ diff-lib.c: static int match_stat_with_submodule(struct diff_options *diffopt, + ce_mark_uptodate(ce); + mark_fsmonitor_valid(istate, ce); + if (!options->flags.find_copies_harder) -+ return 1; ++ return; + } + oldmode = ce->ce_mode; + old_oid = &ce->oid; + new_oid = changed ? null_oid() : &ce->oid; -+ diff_change(options, oldmode, newmode, -+ old_oid, new_oid, -+ !is_null_oid(old_oid), -+ !is_null_oid(new_oid), -+ ce->name, 0, dirty_submodule); -+ return 0; ++ diff_change(options, oldmode, newmode, old_oid, new_oid, ++ !is_null_oid(old_oid), !is_null_oid(new_oid), ++ ce->name, 0, dirty_submodule); +} + int run_diff_files(struct rev_info *revs, unsigned int option) @@ diff-lib.c: int run_diff_files(struct rev_info *revs, unsigned int option) - !is_null_oid(new_oid), - ce->name, 0, dirty_submodule); - -+ if (diff_change_helper(&revs->diffopt, newmode, dirty_submodule, -+ changed, istate, ce)) -+ continue; ++ record_file_diff(&revs->diffopt, newmode, dirty_submodule, ++ changed, istate, ce); } diffcore_std(&revs->diffopt); diff_flush(&revs->diffopt); 6: bb25dadbe5 ! 6: 17010fc179 diff-lib: parallelize run_diff_files for submodules @@ diff-lib.c: static int check_removed(const struct index_state *istate, const str + unsigned *ignore_untracked) { int changed = ie_match_stat(diffopt->repo->index, ce, st, ce_option); -- if (S_ISGITLINK(ce->ce_mode)) { -- struct diff_flags orig_flags = diffopt->flags; -- if (!diffopt->flags.override_submodule_config) -- set_diffopt_flags_from_submodule_config(diffopt, ce->name); ++ int defer = 0; ++ + if (S_ISGITLINK(ce->ce_mode)) { + struct diff_flags orig_flags = diffopt->flags; + if (!diffopt->flags.override_submodule_config) + set_diffopt_flags_from_submodule_config(diffopt, ce->name); - if (diffopt->flags.ignore_submodules) -- changed = 0; ++ if (diffopt->flags.ignore_submodules) { + changed = 0; - else if (!diffopt->flags.ignore_dirty_submodules && - (!changed || diffopt->flags.dirty_submodules)) -+ struct diff_flags orig_flags; -+ int defer = 0; -+ -+ if (!S_ISGITLINK(ce->ce_mode)) -+ goto ret; -+ -+ orig_flags = diffopt->flags; -+ if (!diffopt->flags.override_submodule_config) -+ set_diffopt_flags_from_submodule_config(diffopt, ce->name); -+ if (diffopt->flags.ignore_submodules) { -+ changed = 0; -+ goto cleanup; -+ } -+ if (!diffopt->flags.ignore_dirty_submodules && -+ (!changed || diffopt->flags.dirty_submodules)) { -+ if (defer_submodule_status && *defer_submodule_status) { -+ defer = 1; -+ *ignore_untracked = diffopt->flags.ignore_untracked_in_submodules; -+ } else { - *dirty_submodule = is_submodule_modified(ce->name, +- *dirty_submodule = is_submodule_modified(ce->name, - diffopt->flags.ignore_untracked_in_submodules); -- diffopt->flags = orig_flags; ++ } else if (!diffopt->flags.ignore_dirty_submodules && ++ (!changed || diffopt->flags.dirty_submodules)) { ++ if (defer_submodule_status && *defer_submodule_status) { ++ defer = 1; ++ *ignore_untracked = diffopt->flags.ignore_untracked_in_submodules; ++ } else { ++ *dirty_submodule = is_submodule_modified(ce->name, + diffopt->flags.ignore_untracked_in_submodules); ++ } + } + diffopt->flags = orig_flags; } -+cleanup: -+ diffopt->flags = orig_flags; -+ret: ++ + if (defer_submodule_status) + *defer_submodule_status = defer; return changed; @@ diff-lib.c: int run_diff_files(struct rev_info *revs, unsigned int option) diff_set_mnemonic_prefix(&revs->diffopt, "i/", "w/"); +@@ diff-lib.c: int run_diff_files(struct rev_info *revs, unsigned int option) + unsigned int newmode; + struct cache_entry *ce = istate->cache[i]; + int changed; +- unsigned dirty_submodule = 0; ++ int defer_submodule_status = 1; + + if (diff_can_quit_early(&revs->diffopt)) + break; @@ diff-lib.c: int run_diff_files(struct rev_info *revs, unsigned int option) newmode = ce->ce_mode; } else { struct stat st; + unsigned ignore_untracked = 0; -+ int defer_submodule_status = 1; changed = check_removed(istate, ce, &st); if (changed) { @@ diff-lib.c: int run_diff_files(struct rev_info *revs, unsigned int option) changed = match_stat_with_submodule(&revs->diffopt, ce, &st, - ce_option, &dirty_submodule); -+ ce_option, &dirty_submodule, ++ ce_option, NULL, + &defer_submodule_status, + &ignore_untracked); newmode = ce_mode_from_stat(ce, st.st_mode); @@ diff-lib.c: int run_diff_files(struct rev_info *revs, unsigned int option) + } } - if (diff_change_helper(&revs->diffopt, newmode, dirty_submodule, - changed, istate, ce)) - continue; - } +- record_file_diff(&revs->diffopt, newmode, dirty_submodule, +- changed, istate, ce); ++ if (!defer_submodule_status) ++ record_file_diff(&revs->diffopt, newmode, 0, ++ changed,istate, ce); ++ } + if (submodules.nr) { + unsigned long parallel_jobs; + struct string_list_item *item; @@ diff-lib.c: int run_diff_files(struct rev_info *revs, unsigned int option) + for_each_string_list_item(item, &submodules) { + struct submodule_status_util *util = item->util; + -+ if (diff_change_helper(&revs->diffopt, util->newmode, -+ util->dirty_submodule, util->changed, -+ istate, util->ce)) -+ continue; ++ record_file_diff(&revs->diffopt, util->newmode, ++ util->dirty_submodule, util->changed, ++ istate, util->ce); + } -+ } + } + string_list_clear(&submodules, 1); diffcore_std(&revs->diffopt); diff_flush(&revs->diffopt); @@ submodule.c: struct fetch_task { /** * When a submodule is not defined in .gitmodules, we cannot access it * via the regular submodule-config. Create a fake submodule, which we can -@@ submodule.c: static int parse_status_porcelain(char *str, size_t len, - return 0; - } - -+static void parse_status_porcelain_strbuf(struct strbuf *buf, -+ unsigned *dirty_submodule, -+ int ignore_untracked) -+{ -+ struct string_list list = STRING_LIST_INIT_DUP; -+ struct string_list_item *item; -+ -+ string_list_split(&list, buf->buf, '\n', -1); -+ -+ for_each_string_list_item(item, &list) { -+ if (parse_status_porcelain(item->string, -+ strlen(item->string), -+ dirty_submodule, -+ ignore_untracked)) -+ break; -+ } -+ string_list_clear(&list, 0); -+} -+ - unsigned is_submodule_modified(const char *path, int ignore_untracked) - { - struct child_process cp = CHILD_PROCESS_INIT; @@ submodule.c: unsigned is_submodule_modified(const char *path, int ignore_untracked) return dirty_submodule; } @@ submodule.c: unsigned is_submodule_modified(const char *path, int ignore_untrack + return 0; +} + -+static void status_duplicate_output(struct strbuf *out, ++static void status_on_stderr_output(struct strbuf *out, + size_t offset, + void *cb, void *task_cb) +{ @@ submodule.c: unsigned is_submodule_modified(const char *path, int ignore_untrack + struct string_list_item *it = + string_list_lookup(sps->submodule_names, task->path); + struct submodule_status_util *util = it->util; ++ struct string_list list = STRING_LIST_INIT_DUP; ++ struct string_list_item *item; + + if (retvalue) { + sps->result = 1; + strbuf_addf(err, _(STATUS_PORCELAIN_FAIL_ERROR), task->path); + } + -+ parse_status_porcelain_strbuf(&task->out, -+ &util->dirty_submodule, -+ util->ignore_untracked); -+ ++ string_list_split(&list, task->out.buf, '\n', -1); ++ for_each_string_list_item(item, &list) { ++ if (parse_status_porcelain(item->string, ++ strlen(item->string), ++ &util->dirty_submodule, ++ util->ignore_untracked)) ++ break; ++ } ++ string_list_clear(&list, 0); + strbuf_release(&task->out); + free(task); + @@ submodule.c: unsigned is_submodule_modified(const char *path, int ignore_untrack + + .get_next_task = get_next_submodule_status, + .start_failure = status_start_failure, -+ .duplicate_output = status_duplicate_output, ++ .on_stderr_output = status_on_stderr_output, + .task_finished = status_finish, + .data = &sps, + };