In-Reply-To: <[email protected]>
Andrew Morton wrote:
> The code which you're patching is cheerfully nuked by a patch in Andi's
> tree:
> ftp://ftp.firstfloor.org/pub/ak/x86_64/quilt-current/patches/no-subjiffy-profile
>
> I don't immediately understand that patch and I don't recall seeing it
> discussed - maybe I was asleep.
>
> It removes the profile multiplier (readprofile -M). I've used that
> occasionally, but can't say that I noticed much benefit from it.
It's probably required for the i386-timer-broadcast patch from the same
patchset. Apparently some Intel CPUs stop their local APIC timer when in
certain ACPI C-states, so that patch switches them to use an IPI broadcast
from the main timer interrupt instead. Supporting subjiffy profiling
is impossible in that case, so the code was removed.
--
Chuck
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