From mboxrd@z Thu Jan  1 00:00:00 1970
From: Daniel Bristot de Oliveira <bristot@redhat.com>
Subject: Re: [RFC PATCH 0/5] Generic IPI sending tracepoint
Date: Tue, 11 Oct 2022 18:22:03 +0200
Message-ID: <3e680bb9-9896-3665-dd59-4f2e6f8205bb@redhat.com>
References: <20221007154145.1877054-1-vschneid@redhat.com>
 <Y0CFnWDpMNGajIRD@fuller.cnet> <xhsmhilkqfi7z.mognet@vschneid.remote.csb>
Mime-Version: 1.0
Content-Transfer-Encoding: 7bit
Return-path: <linux-parisc-owner@vger.kernel.org>
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com;
        s=mimecast20190719; t=1665505328;
        h=from:from:reply-to:subject:subject:date:date:message-id:message-id:
         to:to:cc:cc:mime-version:mime-version:content-type:content-type:
         content-transfer-encoding:content-transfer-encoding:
         in-reply-to:in-reply-to:references:references;
        bh=6gv22bmoTax0J0zhnmYTJUdzNvY/rZYRIc0hd8rouMg=;
        b=h5iy8YxiHkC4Kaa6hKdsVflcNHsfyFKnRCMfGVAb6j4l+J6CC+IO/MO0oYNyJuBeXQy2sL
        4uRVxYLTlT3dfO5HE9nlYFAz6+2B1j+BcEcKdmL6EogdvQvzsR6dbn1F12zBI/qvnCKJ9W
        4lRmLYgtG0lfeQg/+i46P0neW2oLejY=
Content-Language: en-US
In-Reply-To: <xhsmhilkqfi7z.mognet@vschneid.remote.csb>
List-ID: <linux-alpha.vger.kernel.org>
Content-Type: text/plain; charset="us-ascii"
To: Valentin Schneider <vschneid@redhat.com>
Cc: linux-alpha@vger.kernel.org, linux-kernel@vger.kernel.org, linux-snps-arc@lists.infradead.org, linux-arm-kernel@lists.infradead.org, linux-csky@vger.kernel.org, linux-hexagon@vger.kernel.org, linux-ia64@vger.kernel.org, loongarch@lists.linux.dev, linux-mips@vger.kernel.org, openrisc@lists.librecores.org, linux-parisc@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, linux-riscv@lists.infradead.org, linux-s390@vger.kernel.org, linux-sh@vger.kernel.org, sparclinux@vger.kernel.org, linux-xtensa@linux-xtensa.org, x86@kernel.org, "Paul E. McKenney" <paulmck@kernel.org>, Steven Rostedt <rostedt@goodmis.org>, Peter Zijlstra <peterz@infradead.org>, Thomas Gleixner <tglx@linutronix.de>, Sebastian Andrzej Siewior <bigeasy@linutronix.de>, Juri Lelli <juri.lelli@redhat.com>, Fred

On 10/11/22 18:17, Valentin Schneider wrote:
> Thinking out loud, it makes way more sense to record a cpumask in the
> tracepoint, but perhaps we could have a postprocessing step to transform
> those into N events each targeting a single CPU?

My approach on the tracers/rtla is to make the simple things in kernel, and beautify
things in user-space.

You could keep the tracepoint as a mask, and then make it pretty, like cpus=3-5,8
in user-space. For example with a trace-cmd/perf loadable plugin, libtracefs helper.

For rtla I was thinking to make a new tool to parse them. and make it pretty there.

-- Daniel