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Groups > linux.kernel > #1391372
| From | Dave Hansen <dave.hansen@linux.intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues |
| Date | 2016-04-29 22:10 +0200 |
| Message-ID | <rtmTE-3yl-11@gated-at.bofh.it> (permalink) |
| References | <r92ut-2hO-1@gated-at.bofh.it> <rtl1w-1Wz-11@gated-at.bofh.it> <rtmTE-3yl-13@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On 04/29/2016 12:57 PM, Yu-cheng Yu wrote: > On Fri, Apr 29, 2016 at 11:09:23AM -0700, Dave Hansen wrote: >> Once we *HAVE* XSAVES support, it also opens up the possibilities for >> doing things like dynamic XSAVE buffer allocation. For instance, let >> threads that are not _using_ AVX-512 not waste the 2k of space for >> it. > > If we can somehow modify exec* system call to scan the executable > binary (in user space) and pass along a bitmask containing xfeatures > used in the binary, and XSAVES is enabled in the kernel, we can > easily save a lot of memory. The kernel only needs to allocate space > for tasks that actually use xstates; most of them do not. That's not feasible. Think of dynamic libraries or just-in-time compilers. What instruction set does /usr/bin/java use, for instance? :)
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Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Dave Hansen <dave.hansen@linux.intel.com> - 2016-04-29 20:10 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Ingo Molnar <mingo@kernel.org> - 2016-04-29 21:50 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Dave Hansen <dave.hansen@linux.intel.com> - 2016-04-29 22:10 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Yu-cheng Yu <yu-cheng.yu@intel.com> - 2016-04-29 22:20 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Andy Lutomirski <luto@amacapital.net> - 2016-04-29 22:30 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Dave Hansen <dave.hansen@linux.intel.com> - 2016-04-29 22:50 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Andy Lutomirski <luto@amacapital.net> - 2016-04-29 22:50 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Dave Hansen <dave.hansen@linux.intel.com> - 2016-04-30 00:50 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Ingo Molnar <mingo@kernel.org> - 2016-04-30 10:00 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Dave Hansen <dave.hansen@linux.intel.com> - 2016-05-02 18:30 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Ingo Molnar <mingo@kernel.org> - 2016-05-02 20:40 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Dave Hansen <dave.hansen@linux.intel.com> - 2016-04-29 22:40 +0200
Re: [PATCH v4 0/10] x86/xsaves: Fix XSAVES known issues Yu-cheng Yu <yu-cheng.yu@intel.com> - 2016-04-29 22:10 +0200
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