Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt

> The real answer here is for the tickless patches to cleaned up to the
> point where they can be merged, and then we won't waste battery power
> entering the timer interrupt in the first place.  :-)

one big step forward for that is to have a

mod_timer_relative() and add_timer_relative()

which 
1) take a relative delay as argument (and thus kill 99% of the jiffies
use in the kernel right there and then)
2) takes it in miliseconds, killing 99% of all the HZ conversions/uses
3) takes a "accuracy" argument

3) is tricky I guess, it's designed for cases that are like "I want a
timer 1 second from now, but it's ok to be also at 1.5 seconds if that
suits you better". Those cases are far less rare than you might think at
first, most watchdog kind things are of this type. This accuracy thing
will allow the kernel to save many wakeups by grouping them I suspect.

Alan: you worked on this before, where did you end up with ?

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

---

• Follow-Ups:
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Eric St-Laurent <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Alan Cox <[email protected]>

• References:
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Chris Wedgwood <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Martin Schlemmer <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Lee Revell <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Arjan van de Ven <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Lee Revell <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Andrew Morton <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Lee Revell <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: Alan Cox <[email protected]>
  • Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
    • From: "Theodore Ts'o" <[email protected]>

• Prev by Date: [PATCH 8/27] Minor cleanup during MAD startup and shutdown
• Next by Date: Re: arm: how to operate leds on zaurus?
• Previous by thread: Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
• Next by thread: Re: [PATCH] i386: Selectable Frequency of the Timer Interrupt
• Index(es):
  • Date
  • Thread

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]