From: Thomas Gleixner <tglx@linutronix.de>
To: Peter Zijlstra <peterz@infradead.org>, x86@kernel.org
Cc: linux-kernel@vger.kernel.org, peterz@infradead.org
Subject: Re: [PATCH 0/2] x86/entry: Trade cycles
Date: Tue, 21 Nov 2023 16:26:24 +0100 [thread overview]
Message-ID: <87msv7161r.ffs@tglx> (raw)
In-Reply-To: <20231120143344.584345121@infradead.org>
On Mon, Nov 20 2023 at 15:33, Peter Zijlstra wrote:
> Two little patches that trade a little performance. First patch optimizes
> (although I couldn't get definite numbers showing it makes a difference) the
> return to user path by avoiding some PTI specifics in the generic path.
>
> Second patch then steals some of the won cycles by making a debug check
> unconditional.
>
> This came forth from a discussion with amluto who lamented we only had the
> debug check conditional on DEBUG_ENTRY.
Reviewed-by: Thomas Gleixner <tglx@linutronix.de>
prev parent reply other threads:[~2023-11-21 15:26 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-11-20 14:33 [PATCH 0/2] x86/entry: Trade cycles Peter Zijlstra
2023-11-20 14:33 ` [PATCH 1/2] x86/entry: Optimize common_interrupt_return() Peter Zijlstra
2023-11-21 13:04 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2023-11-20 14:33 ` [PATCH 2/2] x86/entry: Harden return-to-user Peter Zijlstra
2023-11-21 13:04 ` [tip: x86/entry] " tip-bot2 for Peter Zijlstra
2023-11-21 15:26 ` Thomas Gleixner [this message]
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