linux-kernel - Re: [PATCH v10 05/14] unwind_user/deferred: Add unwind cache

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Message-ID: <20250619044714.5e676bf3@batman.local.home>
Date: Thu, 19 Jun 2025 04:47:14 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Peter Zijlstra <peterz@...radead.org>
Cc: linux-kernel@...r.kernel.org, linux-trace-kernel@...r.kernel.org,
 bpf@...r.kernel.org, x86@...nel.org, Masami Hiramatsu
 <mhiramat@...nel.org>, Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
 Josh Poimboeuf <jpoimboe@...nel.org>, Ingo Molnar <mingo@...nel.org>, Jiri
 Olsa <jolsa@...nel.org>, Namhyung Kim <namhyung@...nel.org>, Thomas
 Gleixner <tglx@...utronix.de>, Andrii Nakryiko <andrii@...nel.org>, Indu
 Bhagat <indu.bhagat@...cle.com>, "Jose E. Marchesi" <jemarch@....org>, Beau
 Belgrave <beaub@...ux.microsoft.com>, Jens Remus <jremus@...ux.ibm.com>,
 Linus Torvalds <torvalds@...ux-foundation.org>, Andrew Morton
 <akpm@...ux-foundation.org>
Subject: Re: [PATCH v10 05/14] unwind_user/deferred: Add unwind cache

On Thu, 19 Jun 2025 09:56:11 +0200
Peter Zijlstra <peterz@...radead.org> wrote:

> Well, the trivial solution is to make it 511 and call it a day. Don't
> make things complicated if you don't have to.

I don't know if this is more complicated, but it should make it fit
nicely in a page:

  /* Make the cache fit in a page */
  #define UNWIND_MAX_ENTRIES                                      \
        ((PAGE_SIZE - sizeof(struct unwind_cache)) / sizeof(long))

-- Steve