From mboxrd@z Thu Jan 1 00:00:00 1970 Delivery-date: Wed, 03 Mar 2021 20:33:51 +0100 Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by lore.white.stw.pengutronix.de with esmtp (Exim 4.92) (envelope-from ) id 1lHXFn-00006H-3V for lore@lore.pengutronix.de; Wed, 03 Mar 2021 20:33:51 +0100 Received: from desiato.infradead.org ([2001:8b0:10b:1:d65d:64ff:fe57:4e05]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lHXFl-0000ic-Fv for lore@pengutronix.de; Wed, 03 Mar 2021 20:33:50 +0100 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=desiato.20200630; h=Sender:Content-Transfer-Encoding :Content-Type:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:Cc:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=upNrPIKLK+NcXDi5sx2f1ylD1eBqeUD1gXMMlHaIg08=; b=Tq0ggejWlFWTk17h0F/T85HvM wk0TedOl5EkQ2wA/Ni0fezjydUqC9NHkRLeJGXrSFC2maodhjMTI0zaqxuDTOtKu84zDjkX9okluv agU+8vEUSO2pdqOGAFMgJQBZIxYVp8dilfVoMCubzwyaPNQqmKrDhV74b7ZI9pDruXNaCL8zvlQQW XS8zLcFL+0fjy4YxxH4qa9crz3CaalgmU4TakfN6j2M9xDUUrUW9ES4yuzI9pNucDWOxaKtqSMJVK CbS5ZlpIY5Zi8hK3pJzAZfKzhopy67dJNU77ETwRAO6Kvho7qv173jns7FzcDITxwTBK33O7HZbtZ iZ+ZV0dcg==; Received: from localhost ([::1] helo=desiato.infradead.org) by desiato.infradead.org with esmtp (Exim 4.94 #2 (Red Hat Linux)) id 1lHXE6-006ECA-9A; Wed, 03 Mar 2021 19:32:06 +0000 Received: from casper.infradead.org ([2001:8b0:10b:1236::1]) by desiato.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lHT3T-005I4B-Q6 for barebox@desiato.infradead.org; Wed, 03 Mar 2021 15:04:52 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=Content-Transfer-Encoding:MIME-Version: References:In-Reply-To:Message-Id:Date:Subject:Cc:To:From:Sender:Reply-To: Content-Type:Content-ID:Content-Description; bh=GWCAaLKUASSZg2AJTKBG1myzUPGLD53ZYl9Yq+cGyr0=; b=gtdmBhBRzhK+53SvQnGrDmR9TD 3m1dj7aCylrduHF1mHl05FwTs68JCDgVwokNoKv59EnJU4tN4jvZ87HrjtwDXHSbtQ8mpEamg88Cw D+Urym/Az0ihIbzkM/Db8NqQZDmsSjT+oSA6d3oIrS8r1aY8WPMJj5bNkzt0tELDn48H5unP1jmQy UI9zyQPqRSvWXbAXv3CbEaEtRWcN+01iJxgF1xpiHLIunnFRJo3xJ+N71v0b3miGzb7BsnCHbZaq+ xPIFplXKVXnfKJ2C1TZ+8a6wXagaFXFersTJxjdbVdka1Obeev9KmXVWYAb1mcxVjPtgufWVt8t5/ VeIw3JLA==; Received: from metis.ext.pengutronix.de ([2001:67c:670:201:290:27ff:fe1d:cc33]) by casper.infradead.org with esmtps (Exim 4.94 #2 (Red Hat Linux)) id 1lHOcr-0029XN-6S for barebox@lists.infradead.org; Wed, 03 Mar 2021 10:21:06 +0000 Received: from dude.hi.pengutronix.de ([2001:67c:670:100:1d::7]) by metis.ext.pengutronix.de with esmtps (TLS1.3:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.92) (envelope-from ) id 1lHOce-0000i5-Kg; Wed, 03 Mar 2021 11:20:52 +0100 Received: from afa by dude.hi.pengutronix.de with local (Exim 4.92) (envelope-from ) id 1lHOcb-0003Ao-0c; Wed, 03 Mar 2021 11:20:49 +0100 From: Ahmad Fatoum To: barebox@lists.infradead.org Cc: Ahmad Fatoum Date: Wed, 3 Mar 2021 11:20:48 +0100 Message-Id: <20210303102048.10275-1-a.fatoum@pengutronix.de> X-Mailer: git-send-email 2.29.2 In-Reply-To: <20210301110106.3764-2-a.fatoum@pengutronix.de> References: <20210301110106.3764-2-a.fatoum@pengutronix.de> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210303_102106_335700_5ADDACA7 X-CRM114-Status: GOOD ( 14.27 ) X-BeenThere: barebox@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" X-SA-Exim-Connect-IP: 2001:8b0:10b:1:d65d:64ff:fe57:4e05 X-SA-Exim-Mail-From: barebox-bounces+lore=pengutronix.de@lists.infradead.org X-Spam-Checker-Version: SpamAssassin 3.4.2 (2018-09-13) on metis.ext.pengutronix.de X-Spam-Level: X-Spam-Status: No, score=-3.4 required=4.0 tests=AWL,BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_NONE autolearn=unavailable autolearn_force=no version=3.4.2 Subject: [PATCH] fixup! common: introduce bthreads, co-operative barebox threads X-SA-Exim-Version: 4.2.1 (built Wed, 08 May 2019 21:11:16 +0000) X-SA-Exim-Scanned: Yes (on metis.ext.pengutronix.de) Signed-off-by: Ahmad Fatoum --- commands/bthread.c | 142 +++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 142 insertions(+) create mode 100644 commands/bthread.c diff --git a/commands/bthread.c b/commands/bthread.c new file mode 100644 index 000000000000..1fd782f03f43 --- /dev/null +++ b/commands/bthread.c @@ -0,0 +1,142 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * Copyright (C) 2021 Ahmad Fatoum, Pengutronix + */ + +#include +#include +#include +#include +#include +#include +#include + +static int bthread_time(void) +{ + uint64_t start = get_time_ns(); + int i = 0; + + /* + * How many background tasks can we have in one second? + * + * A low number here may point to problems with bthreads taking too + * much time. + */ + while (!is_timeout(start, SECOND)) + i++; + + return i; +} + +static int bthread_infinite(void *data) +{ + while (!bthread_should_stop()) + ; + + return 0; +} + +static int bthread_isolated_time(void) +{ + uint64_t start = get_time_ns(); + struct bthread *bthread; + int i = 0; + + bthread = bthread_create(bthread_infinite, NULL, "infinite"); + if (!bthread) + return -ENOMEM; + + bthread_wake(bthread); + + /* + * How many context switches can we do in one second? + * + * A low number here may point to problems with bthreads taking too + * much time. + */ + while (!is_timeout_non_interruptible(start, SECOND)) { + bthread_schedule(bthread); + i += 2; + } + + bthread_stop(bthread); + bthread_free(bthread); + + return i; +} + +static int bthread_printer(void *arg) +{ + volatile u64 start; + volatile int i = 0; + start = get_time_ns(); + + while (!bthread_should_stop()) { + if (!is_timeout_non_interruptible(start, 225 * MSECOND)) + continue; + + printf("%s yield #%d\n", __func__, ++i); + start = get_time_ns(); + } + + return i; +} + +BAREBOX_CMD_HELP_START(bthread) + BAREBOX_CMD_HELP_TEXT("print info about registered barebox threads") + BAREBOX_CMD_HELP_TEXT("") + BAREBOX_CMD_HELP_TEXT("Options:") + BAREBOX_CMD_HELP_OPT ("-i", "Print information about registered bthreads") + BAREBOX_CMD_HELP_OPT ("-t", "measure how many bthreads we currently run in 1s") + BAREBOX_CMD_HELP_OPT ("-c", "count maximum context switches in 1s") + BAREBOX_CMD_HELP_OPT ("-v", "verify correct bthread operation") + BAREBOX_CMD_HELP_END + +static int do_bthread(int argc, char *argv[]) +{ + struct bthread *bthread = NULL; + int ret, opt; + int yields; + + while ((opt = getopt(argc, argv, "itcv")) > 0) { + switch (opt) { + case 'i': + bthread_info(); + return 0; + case 'c': + yields = bthread_isolated_time(); + printf("%d bthread context switches possible in 1s\n", yields); + break; + case 'v': + bthread = bthread_create(bthread_printer, NULL, "bthread"); + if (!bthread) + return -ENOMEM; + + bthread_wake(bthread); + + /* fallthrough */ + case 't': + yields = bthread_time(); + printf("%d bthread yield calls in 1s\n", yields); + } + + if (bthread) { + ret = bthread_stop(bthread); + bthread_free(bthread); + + if (ret != 4 || yields < ret) + return COMMAND_ERROR; + } + + return 0; + } + + return COMMAND_ERROR_USAGE; +} + +BAREBOX_CMD_START(bthread) + .cmd = do_bthread, + BAREBOX_CMD_DESC("print info about registered bthreads") + BAREBOX_CMD_GROUP(CMD_GRP_MISC) + BAREBOX_CMD_HELP(cmd_bthread_help) +BAREBOX_CMD_END -- 2.29.2 _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox