From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 79B1B27729 for ; Mon, 16 Oct 2023 15:38:16 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Ser5PMkz" Received: by smtp.kernel.org (Postfix) with ESMTPSA id B41AAC433CA; Mon, 16 Oct 2023 15:38:15 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1697470695; bh=wtC6ekFrSeHsJyDMoZcgF7d8+qu8m8xwaumKuPeAXd4=; h=Date:From:To:Cc:Subject:References:In-Reply-To:From; b=Ser5PMkz2wEu6pyX7zJkesK3olhWDPQ4oeeoGJj99lV5GcAFDrnMDo+icKrldb7kx aEFqF0XHEYyFFL1ORjedSayoa7Bwh6NSbTQvbUDmZs4RqEJb+YoLcqniFPdaaZ6Dzu sa0W7FSnlEYzY4sZ1sQjGcvtvDH1gn3aAMRa5hsEihRLFdwJJuQeRscnfhvZafHeGZ of13Z6JeNR1c/kiB1n8tadcPxj6U3FyR54MyCGSC1IN8G1Aubgxx89imFSzWZuYKyx n/jzwn8wUcOksYxi/RC93OSZ0uasjNtwVw9ifcYuseFWilggTw20ik/tYgVTwLv81y FrfB590iNn3tA== Received: by quaco.ghostprotocols.net (Postfix, from userid 1000) id EE3B240016; Mon, 16 Oct 2023 12:38:12 -0300 (-03) Date: Mon, 16 Oct 2023 12:38:12 -0300 From: Arnaldo Carvalho de Melo To: Ingo Molnar Cc: Namhyung Kim , Jiri Olsa , Ian Rogers , Adrian Hunter , Peter Zijlstra , LKML , linux-perf-users@vger.kernel.org Subject: Re: [PATCH v3] perf bench sched pipe: Add -G/--cgroups option Message-ID: References: <20231016044225.1125674-1-namhyung@kernel.org> Precedence: bulk X-Mailing-List: linux-perf-users@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Url: http://acmel.wordpress.com Em Mon, Oct 16, 2023 at 11:35:35AM +0200, Ingo Molnar escreveu: > > > * Namhyung Kim wrote: > > > + /* try cgroup v2 interface first */ > > + if (threaded) > > + fd = openat(cgrp->fd, "cgroup.threads", O_WRONLY); > > + else > > + fd = openat(cgrp->fd, "cgroup.procs", O_WRONLY); > > + > > + /* try cgroup v1 if failed */ > > + if (fd < 0) > > + fd = openat(cgrp->fd, "tasks", O_WRONLY); > > + > > + if (fd < 0) { > > + char mnt[PATH_MAX]; > > + > > + printf("Failed to open cgroup file in %s\n", cgrp->name); > > + > > + if (cgroupfs_find_mountpoint(mnt, sizeof(mnt), "perf_event") == 0) > > + printf(" Hint: create the cgroup first, like 'mkdir %s/%s'\n", > > + mnt, cgrp->name); > > Ok, this works too I suppose. > > Acked-by: Ingo Molnar I'm not getting that: [root@five ~]# perf bench sched pipe -l 10000 -G AAA,BBB # Running 'sched/pipe' benchmark: no access to cgroup /sys/fs/cgroup/AAA cannot open sender cgroup: AAA Usage: perf bench sched pipe -G, --cgroups Put sender and receivers in given cgroups [root@five ~]# Its better now as it bails out, but it is not emitting any message that helps with running the test, well, there is that /sys/fs/cgroup/AAA path, lemme try doing a mkdir: [root@five ~]# perf bench sched pipe -l 10000 -G AAA,BBB # Running 'sched/pipe' benchmark: no access to cgroup /sys/fs/cgroup/BBB cannot open receiver cgroup: BBB Usage: perf bench sched pipe -G, --cgroups Put sender and receivers in given cgroups [root@five ~]# [root@five ~]# perf bench sched pipe -l 10000 -G AAA,BBB # Running 'sched/pipe' benchmark: [root@five ~]# It seems to be bailing out but doesn't run the test nor emits any warning. I'm using v3. I'll try to debug it a bit. - Arnaldo