From 908b5301124cf673a2ee44de652968aa5360afd1 Mon Sep 17 00:00:00 2001 From: k0kubun Date: Mon, 18 Mar 2019 01:52:45 +0000 Subject: Revert "Request inline cache values from mjit_compile" This reverts commit 4161674b2fbea6bdd01783ac5d3b39d88db22972. Revert "Eliminate mjit_copy_job_t reference from mjit_worker" This reverts commit d86a1aa045959dfbf5cd472eae0d043180259727. Reverting them because of CI failures git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@67291 b2dd03c8-39d4-4d8f-98ff-823fe69b080e --- mjit_worker.c | 107 +++++++++++++++++++++++++--------------------------------- 1 file changed, 46 insertions(+), 61 deletions(-) (limited to 'mjit_worker.c') diff --git a/mjit_worker.c b/mjit_worker.c index 0a0601d23f..94eda53176 100644 --- a/mjit_worker.c +++ b/mjit_worker.c @@ -986,7 +986,7 @@ compile_prelude(FILE *f) /* Compile ISeq in UNIT and return function pointer of JIT-ed code. It may return NOT_COMPILED_JIT_ISEQ_FUNC if something went wrong. */ static mjit_func_t -convert_unit_to_func(struct rb_mjit_unit *unit) +convert_unit_to_func(struct rb_mjit_unit *unit, struct rb_call_cache *cc_entries, union iseq_inline_storage_entry *is_entries) { char c_file_buff[MAXPATHLEN], *c_file = c_file_buff, *so_file, funcname[35]; /* TODO: reconsider `35` */ int fd; @@ -1067,7 +1067,7 @@ convert_unit_to_func(struct rb_mjit_unit *unit) verbose(2, "start compilation: %s@%s:%d -> %s", label, path, lineno, c_file); fprintf(f, "/* %s@%s:%d */\n\n", label, path, lineno); } - bool success = mjit_compile(f, unit->iseq, funcname); + bool success = mjit_compile(f, unit->iseq->body, funcname, cc_entries, is_entries); /* release blocking mjit_gc_start_hook */ CRITICAL_SECTION_START(3, "after mjit_compile to wakeup client for GC"); @@ -1141,66 +1141,33 @@ static void mjit_copy_job_handler(void *data); /* vm_trace.c */ int rb_workqueue_register(unsigned flags, rb_postponed_job_func_t , void *); -// Copy inline cache values of `iseq` to `*cc_entries` and `*is_entries`. -// Return true if copy succeeds or is not needed. -// -// We're lazily copying cache values from main thread because these cache values -// could be different between ones on enqueue timing and ones on dequeue timing. -bool -mjit_copy_cache_from_main_thread(const rb_iseq_t *iseq, struct rb_call_cache **cc_entries, union iseq_inline_storage_entry **is_entries) +/* We're lazily copying cache values from main thread because these cache values + could be different between ones on enqueue timing and ones on dequeue timing. + Return true if copy succeeds. */ +static bool +copy_cache_from_main_thread(mjit_copy_job_t *job) { - mjit_copy_job_t *job = &mjit_copy_job; // just a short hand - - CRITICAL_SECTION_START(3, "in mjit_copy_cache_from_main_thread"); - job->finish_p = true; // disable dispatching this job in mjit_copy_job_handler while it's being modified - CRITICAL_SECTION_FINISH(3, "in mjit_copy_cache_from_main_thread"); - - const struct rb_iseq_constant_body *body = iseq->body; - job->cc_entries = NULL; - if (body->ci_size > 0 || body->ci_kw_size > 0) - job->cc_entries = alloca(sizeof(struct rb_call_cache) * (body->ci_size + body->ci_kw_size)); - job->is_entries = NULL; - if (body->is_size > 0) - job->is_entries = alloca(sizeof(union iseq_inline_storage_entry) * body->is_size); - - // If ISeq has no inline cache, there's no need to run a copy job. - if (job->cc_entries == NULL && job->is_entries == NULL) { - *cc_entries = job->cc_entries; - *is_entries = job->is_entries; - return true; - } - - CRITICAL_SECTION_START(3, "in mjit_copy_cache_from_main_thread"); - job->iseq = iseq; // Prevernt GC of this ISeq from here + CRITICAL_SECTION_START(3, "in copy_cache_from_main_thread"); job->finish_p = false; // allow dispatching this job in mjit_copy_job_handler - CRITICAL_SECTION_FINISH(3, "in mjit_copy_cache_from_main_thread"); + CRITICAL_SECTION_FINISH(3, "in copy_cache_from_main_thread"); if (UNLIKELY(mjit_opts.wait)) { mjit_copy_job_handler((void *)job); - } else if (rb_workqueue_register(0, mjit_copy_job_handler, (void *)job)) { - CRITICAL_SECTION_START(3, "in MJIT copy job wait"); - // checking `stop_worker_p` too because `RUBY_VM_CHECK_INTS(ec)` may not - // lush mjit_copy_job_handler when EC_EXEC_TAG() is not TAG_NONE, and then - // `stop_worker()` could dead lock with this function. - while (!job->finish_p && !stop_worker_p) { - rb_native_cond_wait(&mjit_worker_wakeup, &mjit_engine_mutex); - verbose(3, "Getting wakeup from client"); - } - CRITICAL_SECTION_FINISH(3, "in MJIT copy job wait"); + return job->finish_p; } - // Set result values. - *cc_entries = job->cc_entries; - *is_entries = job->is_entries; - - bool result = job->finish_p; - CRITICAL_SECTION_START(3, "in mjit_copy_cache_from_main_thread"); - job->iseq = NULL; // Allow GC of this ISeq from here - // Disable dispatching this job in mjit_copy_job_handler while memory allocated by alloca - // could be expired after finishing this function. - job->finish_p = true; - CRITICAL_SECTION_FINISH(3, "in mjit_copy_cache_from_main_thread"); - return result; + if (!rb_workqueue_register(0, mjit_copy_job_handler, (void *)job)) + return false; + CRITICAL_SECTION_START(3, "in MJIT copy job wait"); + /* checking `stop_worker_p` too because `RUBY_VM_CHECK_INTS(ec)` may not + lush mjit_copy_job_handler when EC_EXEC_TAG() is not TAG_NONE, and then + `stop_worker()` could dead lock with this function. */ + while (!job->finish_p && !stop_worker_p) { + rb_native_cond_wait(&mjit_worker_wakeup, &mjit_engine_mutex); + verbose(3, "Getting wakeup from client"); + } + CRITICAL_SECTION_FINISH(3, "in MJIT copy job wait"); + return job->finish_p; } /* The function implementing a worker. It is executed in a separate @@ -1209,6 +1176,8 @@ mjit_copy_cache_from_main_thread(const rb_iseq_t *iseq, struct rb_call_cache **c void mjit_worker(void) { + mjit_copy_job_t *job = &mjit_copy_job; /* just a shorthand */ + #ifndef _MSC_VER if (pch_status == PCH_NOT_READY) { make_pch(); @@ -1235,16 +1204,28 @@ mjit_worker(void) verbose(3, "Getting wakeup from client"); } unit = get_from_list(&unit_queue); + if (unit) job->iseq = unit->iseq; + job->finish_p = true; // disable dispatching this job in mjit_copy_job_handler while it's being modified CRITICAL_SECTION_FINISH(3, "in worker dequeue"); if (unit) { - // JIT compile - mjit_func_t func = convert_unit_to_func(unit); + const struct rb_iseq_constant_body *body = unit->iseq->body; + job->cc_entries = NULL; + if (body->ci_size > 0 || body->ci_kw_size > 0) + job->cc_entries = alloca(sizeof(struct rb_call_cache) * (body->ci_size + body->ci_kw_size)); + job->is_entries = NULL; + if (body->is_size > 0) + job->is_entries = alloca(sizeof(union iseq_inline_storage_entry) * body->is_size); + + /* Copy ISeq's inline caches values to avoid race condition. */ + if (job->cc_entries != NULL || job->is_entries != NULL) { + if (copy_cache_from_main_thread(job) == false) { + continue; /* retry postponed_job failure, or stop worker */ + } + } - // `mjit_copy_cache_from_main_thread` in `mjit_compile` may wait for a long time - // and worker may be stopped during the compilation. - if (stop_worker_p) - break; + // JIT compile + mjit_func_t func = convert_unit_to_func(unit, job->cc_entries, job->is_entries); CRITICAL_SECTION_START(3, "in jit func replace"); while (in_gc) { /* Make sure we're not GC-ing when touching ISeq */ @@ -1267,6 +1248,10 @@ mjit_worker(void) } } + // Disable dispatching this job in mjit_copy_job_handler while memory allocated by alloca + // could be expired after finishing this function. + job->finish_p = true; + // To keep mutex unlocked when it is destroyed by mjit_finish, don't wrap CRITICAL_SECTION here. worker_stopped = true; } -- cgit v1.2.3