Messages in this thread | | | Date | Mon, 16 Nov 2020 17:57:07 +0100 | From | Peter Zijlstra <> | Subject | Re: [PATCH 0/5] perf/mm: Fix PERF_SAMPLE_*_PAGE_SIZE |
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On Mon, Nov 16, 2020 at 08:36:36AM -0800, Dave Hansen wrote: > On 11/16/20 8:32 AM, Matthew Wilcox wrote: > >> > >> That's really the best we can do from software without digging into > >> microarchitecture-specific events. > > I mean this is perf. Digging into microarch specific events is what it > > does ;-) > > Yeah, totally.
Sure, but the automatic promotion/demotion of TLB sizes is not visible if you don't know what you startd out with.
> But, if we see a bunch of 4k TLB hit events, it's still handy to know > that those 4k TLB hits originated from a 2M page table entry. This > series just makes sure that perf has the data about the page table > mapping sizes regardless of what the microarchitecture does with it.
This.
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