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Message-ID: <538397F5.6010002@amacapital.net> Date: Mon, 26 May 2014 12:37:25 -0700 From: Andy Lutomirski <luto@...capital.net> To: Fenghua Yu <fenghua.yu@...el.com>, "H. Peter Anvin" <hpa@...ux.intel.com>, Ingo Molnar <mingo@...e.hu>, Thomas Gleixner <tglx@...utronix.de>, Asit K Mallick <asit.k.mallick@...el.com> CC: linux-kernel <linux-kernel@...r.kernel.org>, x86 <x86@...nel.org> Subject: Re: [PATCH 0/15] x86/xsaves: Optimize xstate context switch by xsaves/xrstors On 05/26/2014 10:01 AM, Fenghua Yu wrote: > From: Fenghua Yu <fenghua.yu@...el.com> > > With ever growing extended state registers (xstate) on x86 processors, kernel > needs to cope with issue of growing memory space occupied by xstate. The xsave > area is holding more and more xstate registers, growing from legacy FP and > SSE to AVX, AVX2, AVX-512, MPX, and Intel PT. > > The recently introduced compacted format of xsave area saves xstates only > for enabled states. This patch set saves the xsave area space per process > in compacted format by xsaves/xrstors instructions. Are we going to want to encourage userspace to do something like sticking vzeroupper right before each syscall to make any xsaves/xrestores faster? --Andy -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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