linux-kernel - Re: [PATCH v7 00/31] context_tracking,x86: Defer some IPIs until a user->kernel transition

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Message-ID: <87zf8o9y5x.ffs@tglx>
Date: Fri, 14 Nov 2025 21:06:34 +0100
From: Thomas Gleixner <tglx@...utronix.de>
To: Andy Lutomirski <luto@...nel.org>, "Paul E. McKenney" <paulmck@...nel.org>
Cc: Valentin Schneider <vschneid@...hat.com>, Linux Kernel Mailing List
 <linux-kernel@...r.kernel.org>, linux-mm@...ck.org, rcu@...r.kernel.org,
 the arch/x86 maintainers <x86@...nel.org>,
 linux-arm-kernel@...ts.infradead.org, loongarch@...ts.linux.dev,
 linux-riscv@...ts.infradead.org, linux-arch@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
 Borislav Petkov <bp@...en8.de>, Dave Hansen <dave.hansen@...ux.intel.com>,
 "H. Peter Anvin" <hpa@...or.com>, "Peter Zijlstra (Intel)"
 <peterz@...radead.org>, Arnaldo Carvalho de Melo <acme@...nel.org>, Josh
 Poimboeuf <jpoimboe@...nel.org>, Paolo Bonzini <pbonzini@...hat.com>, Arnd
 Bergmann <arnd@...db.de>, Frederic Weisbecker <frederic@...nel.org>, Jason
 Baron <jbaron@...mai.com>, Steven Rostedt <rostedt@...dmis.org>, Ard
 Biesheuvel <ardb@...nel.org>, Sami Tolvanen <samitolvanen@...gle.com>,
 "David S. Miller" <davem@...emloft.net>, Neeraj Upadhyay
 <neeraj.upadhyay@...nel.org>, Joel Fernandes <joelagnelf@...dia.com>, Josh
 Triplett <josh@...htriplett.org>, Boqun Feng <boqun.feng@...il.com>,
 Uladzislau Rezki <urezki@...il.com>, Mathieu Desnoyers
 <mathieu.desnoyers@...icios.com>, Mel Gorman <mgorman@...e.de>, Andrew
 Morton <akpm@...ux-foundation.org>, Masahiro Yamada
 <masahiroy@...nel.org>, Han Shen <shenhan@...gle.com>, Rik van Riel
 <riel@...riel.com>, Jann Horn <jannh@...gle.com>, Dan Carpenter
 <dan.carpenter@...aro.org>, Oleg Nesterov <oleg@...hat.com>, Juri Lelli
 <juri.lelli@...hat.com>, Clark Williams <williams@...hat.com>, Yair
 Podemsky <ypodemsk@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
 Daniel Wagner <dwagner@...e.de>, Petr Tesarik <ptesarik@...e.com>,
 Shrikanth Hegde <sshegde@...ux.ibm.com>
Subject: Re: [PATCH v7 00/31] context_tracking,x86: Defer some IPIs until a
 user->kernel transition

On Fri, Nov 14 2025 at 10:45, Andy Lutomirski wrote:
> But I did that test on a machine that would absolutely benefit from
> the IPI suppression that the OP is talking about here, and I think it
> would be really quite nice if a default distro kernel with a more or
> less default distribution could be easily convinced to run a user
> thread without interrupting it.  It's a little bit had that NO_HZ_FULL
> is still an exotic non-default thing, IMO.

Feel free to help with getting it over the finish line. Feeling sad/bad
(or whatever you wanted to say with 'had') does not change anything as
you should know :)

Thanks,

        tglx