Re: Tickless Hz/hrtimers/etc. on PowerPC
From: Sergei Shtylyov <hidden>
Date: 2007-07-12 14:09:43
Hello. Domen Puncer wrote:
quoted
Does anyone have the definitive patchset to enable the tickless hz, some kind of hrtimer and the other related improvements in the PowerPC tree?
I use attached patches for tickless. Order in which they're applied:
PowerPC_GENERIC_CLOCKEVENTS.patch
That's my patch which used to have both description and signoff that I'm
not seeing in the attached version...
PowerPC_GENERIC_TIME.linux-2.6.18-rc6_timeofday-arch-ppc_C6.patch
This one should come first of all, I'd say...
Note that it breaks TOD vsyscalls, so you need my patch that removes
support for those for the time being (i.e. until Tony hopefully fixes this
:-). Also, there was a patch implementing read_persistent_clock() and getting
rid of the code setting xtime in time_init(). Attaching them both...
PowerPC_enable_HRT_and_dynticks_support.patch
Again looks like my patch with description/signoff missing for whatever
reason...
PowerPC_no_hz_fix.patch
This has nothing to do with CONFIG_NO_HZ per se -- it fixes the
compilation error introduced by John's patch.
tickless-enable.patch
That one doesn't look quite right...
HTH
Domen
[...]
------------------------------------------------------------------------ This is needed for hrtimer_switch_to_hres() to get called. hrtimer_run_queues() |-tick_check_oneshot_change() | \-timekeeping_is_continuous() | \- flags check \-hrtimer_switch_to_hres()
Signed-off-by: Domen Puncer <redacted>
quoted hunk ↗ jump to hunk
Index: work-powerpc.git/arch/powerpc/kernel/time.c ===================================================================--- work-powerpc.git.orig/arch/powerpc/kernel/time.c +++ work-powerpc.git/arch/powerpc/kernel/time.c@@ -1039,6 +1039,7 @@ struct clocksource clocksource_timebase .mask = (cycle_t)-1, .mult = 0, .shift = 22, + .flags = CLOCK_SOURCE_VALID_FOR_HRES, };
Hm, has the flag name changed from CLOCK_SOURCE_IS_CONTINOUS? I'm seeign
both there flags, therefore it must be CLOCK_SOURCE_IS_CONTINOUS, not
CLOCK_SOURCE_VALID_FOR_HRES.
WBR, Sergei
PS: All attached patches are against 2.6.21-rt2 -- fitting them into the
current (or whatever) version of the kernel is left as an excercise to the
readers. ;-)
Attachments
- ppc-remove-broken-vsyscalls.patch [text/x-patch] 23295 bytes · preview
- gtod-persistent-clock-support-ppc.patch [text/x-patch] 2969 bytes · preview