linux-kernel - Re: [RESEND][PATCH 0/5] perf: Clean ups and simplifications

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Message-ID: <20250825111213.GV3245006@noisy.programming.kicks-ass.net>
Date: Mon, 25 Aug 2025 13:12:13 +0200
From: Peter Zijlstra <peterz@...radead.org>
To: Steven Rostedt <rostedt@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
	linux-perf-users@...r.kernel.org,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Mark Rutland <mark.rutland@....com>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Ingo Molnar <mingo@...hat.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
	Jiri Olsa <jolsa@...nel.org>, Ian Rogers <irogers@...gle.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	"Liang, Kan" <kan.liang@...ux.intel.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RESEND][PATCH 0/5] perf: Clean ups and simplifications

On Wed, Aug 20, 2025 at 02:03:38PM -0400, Steven Rostedt wrote:
> 
> This is a resend from: https://lore.kernel.org/linux-trace-kernel/20250717173125.434618999@kernel.org/
> 
> It cleanly applied on top of the latest tip/perf/core:
>   448f97fba901 ("perf: Convert mmap() refcounts to refcount_t")
> 
> The ongoing work to support sframes[1] in the kernel required a few clean ups
> to the perf kernel side. Instead of having these changes in the ongoing
> work, there's no reason they cannot be applied now.
> 
> These are just clean ups to the perf code to help simplify the updates that
> will be made later.
> 
> [1] https://lore.kernel.org/linux-trace-kernel/20250708020003.565862284@kernel.org
> 
> 
> Josh Poimboeuf (4):
>       perf: Remove get_perf_callchain() init_nr argument
>       perf: Have get_perf_callchain() return NULL if crosstask and user are set
>       perf: Simplify get_perf_callchain() user logic
>       perf: Skip user unwind if the task is a kernel thread
> 
> Steven Rostedt (1):
>       perf: Use current->flags & PF_KTHREAD|PF_USER_WORKER instead of current->mm == NULL

Thanks!