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From: "Chang S. Bae" <chang.seok.bae@intel.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: <linux-kernel@vger.kernel.org>, <x86@kernel.org>,
	<tglx@linutronix.de>, <mingo@redhat.com>, <bp@alien8.de>,
	<dave.hansen@linux.intel.com>
Subject: Re: [DISCUSSION] x86: In-Kernel Use of Extended General-Purpose Registers
Date: Mon, 1 Dec 2025 13:40:37 -0800	[thread overview]
Message-ID: <83990588-098c-4c99-984a-a0fb2d05670d@intel.com> (raw)
In-Reply-To: <20251126163047.GA3666665@noisy.programming.kicks-ass.net>

On 11/26/2025 8:30 AM, Peter Zijlstra wrote:
> 
> IIRC it isn't hard to make kernel_fpu_begin/end() preemptible. It came
> up with the last xsave rework -- mostly in the context of -rt, but
> nobody ever picked it up and did it.

Thanks for looking at this! Looks like I couldn't spot on that exact 
thread though, I suppose another XSAVE buffer to do so. In any case, I'd 
bring up this option in a slide deck, as something worth revisiting.

Thanks,
Chang

      reply	other threads:[~2025-12-01 21:40 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2025-11-24 21:32 Chang S. Bae
2025-11-24 21:32 ` [RFC PATCH 1/3] x86/lib: Refactor csum_partial_copy_generic() into a macro Chang S. Bae
2025-11-24 21:32 ` [RFC PATCH 2/3] x86/lib: Convert repeated asm sequences in checksum copy into macros Chang S. Bae
2025-11-24 21:32 ` [RFC PATCH 3/3] x86/lib: Use EGPRs in 64-bit checksum copy loop Chang S. Bae
2025-11-25 10:37   ` david laight
2025-12-01 21:39     ` Chang S. Bae
2025-11-26 16:30 ` [DISCUSSION] x86: In-Kernel Use of Extended General-Purpose Registers Peter Zijlstra
2025-12-01 21:40   ` Chang S. Bae [this message]

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