lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  PHC 
Open Source and information security mailing list archives
Hash Suite: Windows password security audit tool. GUI, reports in PDF.
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Date:   Mon, 16 Nov 2020 17:57:07 +0100
From:   Peter Zijlstra <>
To:     Dave Hansen <>
Cc:     Matthew Wilcox <>,
        "Kirill A. Shutemov" <>,,,,,,,,,,,,,,,,,,,,
Subject: Re: [PATCH 0/5] perf/mm: Fix PERF_SAMPLE_*_PAGE_SIZE

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.


Powered by blists - more mailing lists