Messages in this thread | | | From | Kairui Song <> | Date | Wed, 17 Apr 2019 22:41:52 +0800 | Subject | Re: [RFC PATCH v2] perf/x86: make perf callchain work without CONFIG_FRAME_POINTER |
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On Wed, Apr 17, 2019 at 1:45 AM Peter Zijlstra <peterz@infradead.org> wrote: > > On Wed, Apr 17, 2019 at 01:39:19AM +0800, Kairui Song wrote: > > And I also think the "fake"/"real" reg is fragile, could we abuse > > another eflag (just like PERF_EFLAGS_EXACT) to indicate the regs are > > partially dumped fake registers? > > Sure, the SDM seems to suggest bits 1,3,5,15 are 'available'. We've > already used 3 and 5, and I think we can use !X86_EFLAGS_FIXED to > indicate a fake regs set. Any real regs set will always have that set.
Thanks! This is a good idea. Will update accordingly in V3 later.
-- Best Regards, Kairui Song
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