Messages in this thread | | | Date | Fri, 2 Jul 2021 20:57:39 +0200 | From | Peter Zijlstra <> | Subject | Re: [GIT PULL] Clang feature updates for v5.14-rc1 |
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On Fri, Jul 02, 2021 at 10:26:40AM -0700, Nick Desaulniers wrote: > On Fri, Jul 2, 2021 at 5:57 AM Peter Zijlstra <peterz@infradead.org> wrote:
> > I've asked this before; *what* is missing from LBR samples that's > > reponsible for the performance gap? > > Are we able to collect LBR samples from __init code? I can imagine > trying to launch perf from init/pid 1, but I suspect at that point > it's way too late. > > Increasingly, boot times of hosts (and virtualized guests) are > becoming important to us, both in the datacenters and on mobile.
For a guest, possibly, I've no idea how any of that virt crud works.
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