From patchwork Tue Feb 26 11:03:53 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Chris Wilson X-Patchwork-Id: 10829901 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 9C972139A for ; Tue, 26 Feb 2019 11:04:17 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 8B6DA28470 for ; Tue, 26 Feb 2019 11:04:17 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 7FF1C28555; Tue, 26 Feb 2019 11:04:17 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_MED autolearn=ham version=3.3.1 Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher DHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id 3527A28470 for ; Tue, 26 Feb 2019 11:04:17 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id A378089DB0; Tue, 26 Feb 2019 11:04:14 +0000 (UTC) X-Original-To: intel-gfx@lists.freedesktop.org Delivered-To: intel-gfx@lists.freedesktop.org Received: from fireflyinternet.com (mail.fireflyinternet.com [109.228.58.192]) by gabe.freedesktop.org (Postfix) with ESMTPS id 6F46689DA5; Tue, 26 Feb 2019 11:04:12 +0000 (UTC) X-Default-Received-SPF: pass (skip=forwardok (res=PASS)) x-ip-name=78.156.65.138; Received: from haswell.alporthouse.com (unverified [78.156.65.138]) by fireflyinternet.com (Firefly Internet (M1)) with ESMTP id 15703669-1500050 for multiple; Tue, 26 Feb 2019 11:03:59 +0000 From: Chris Wilson To: intel-gfx@lists.freedesktop.org Date: Tue, 26 Feb 2019 11:03:53 +0000 Message-Id: <20190226110357.12237-3-chris@chris-wilson.co.uk> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20190226110357.12237-1-chris@chris-wilson.co.uk> References: <20190226110357.12237-1-chris@chris-wilson.co.uk> MIME-Version: 1.0 Subject: [Intel-gfx] [PATCH i-g-t 3/7] i915/gem_exec_schedule: Measure semaphore power consumption X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: igt-dev@lists.freedesktop.org Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" X-Virus-Scanned: ClamAV using ClamSMTP How much energy does spinning on a semaphore consume relative to plain old spinning? Signed-off-by: Chris Wilson --- tests/i915/gem_exec_schedule.c | 72 +++++++++++++++++++++++++++++++++- 1 file changed, 71 insertions(+), 1 deletion(-) diff --git a/tests/i915/gem_exec_schedule.c b/tests/i915/gem_exec_schedule.c index a9383000a..4f0577b4e 100644 --- a/tests/i915/gem_exec_schedule.c +++ b/tests/i915/gem_exec_schedule.c @@ -29,9 +29,10 @@ #include #include "igt.h" -#include "igt_vgem.h" +#include "igt_gpu_power.h" #include "igt_rand.h" #include "igt_sysfs.h" +#include "igt_vgem.h" #include "i915/gem_ring.h" #define LO 0 @@ -1202,6 +1203,65 @@ static void test_pi_ringfull(int fd, unsigned int engine) munmap(result, 4096); } +static void measure_semaphore_power(int i915) +{ + struct gpu_power power; + unsigned int engine, signaler; + + igt_require(gpu_power_open(&power) == 0); + + for_each_physical_engine(i915, signaler) { + struct gpu_power_sample s_spin[2]; + struct gpu_power_sample s_sema[2]; + double baseline, total; + int64_t jiffie = 1; + igt_spin_t *spin; + + spin = __igt_spin_batch_new(i915, + .engine = signaler, + .flags = IGT_SPIN_POLL_RUN); + gem_wait(i915, spin->handle, &jiffie); /* waitboost */ + igt_assert(spin->running); + igt_spin_busywait_until_running(spin); + + gpu_power_read(&power, &s_spin[0]); + usleep(100*1000); + gpu_power_read(&power, &s_spin[1]); + + /* Add a waiter to each engine */ + for_each_physical_engine(i915, engine) { + igt_spin_t *sema; + + if (engine == signaler) + continue; + + sema = __igt_spin_batch_new(i915, + .engine = engine, + .dependency = spin->handle); + + igt_spin_batch_free(i915, sema); + } + usleep(10); /* just give the tasklets a chance to run */ + + gpu_power_read(&power, &s_sema[0]); + usleep(100*1000); + gpu_power_read(&power, &s_sema[1]); + + igt_spin_batch_free(i915, spin); + + baseline = gpu_power_W(&power, &s_spin[0], &s_spin[1]); + total = gpu_power_W(&power, &s_sema[0], &s_sema[1]); + + igt_info("%s: %.1fmW + %.1fmW (total %1.fmW)\n", + e__->name, + 1e3 * baseline, + 1e3 * (total - baseline), + 1e3 * total); + } + + gpu_power_close(&power); +} + igt_main { const struct intel_execution_engine *e; @@ -1362,6 +1422,16 @@ igt_main } } + igt_subtest_group { + igt_fixture { + igt_require(gem_scheduler_enabled(fd)); + igt_require(gem_scheduler_has_semaphores(fd)); + } + + igt_subtest("semaphore-power") + measure_semaphore_power(fd); + } + igt_fixture { igt_stop_hang_detector(); close(fd);