Messages in this thread | | | Date | Fri, 19 Jan 2007 09:29:37 +0000 | From | Pavel Machek <> | Subject | Re: [RFC] [PATCH] Power S3 Resume Optimization Patch. Request for Comment |
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Hi!
> [RFC][PATCH] Power S3 Resume optimisation > Here is a simple patch for optimising the S3 resume. With this > patch the resume time is 0.85. Given the fact that device initialisation > on the resume takes almost 70% of time, By executing the whole > "device_resume()" function on a seperate kernel thread, the resume gets > completed( ie. the user can precieve) by ~0.85 sec.
Yep, but you also break it completely...
> To avoid any possible race condition while processing the IO > request and to make sure all the io request are queued till the device > resume thread exits, the IO schedulars (patched cfq and as) checks a for > system_resume flag, which is set when the device resume thread starts, > if the flag is set, it doesnt put the request in the dispatch queue. > Once the flag is cleared i.e when the device resume thread is complete, > the IO-schedular behave as in normal situation.
And you noticed that, so you fixed obvious problems on block devices. Ignoring char and net devices completely.
> @@ -1088,6 +1088,19 @@ > if (list_empty(&ad->fifo_list[adir])) > return 0; > > + /* > + * Check here for the System resume flag to be cleared, if flag > is > + * still set the resume thread hasnt completed yet, and hence > dont > + * takeout any new request from the FIFO > + */ > + extern int system_resuming; > + if (system_resuming != 0) > + {
Locking. CodingStyle.
> -static void suspend_finish(suspend_state_t state) > +static int dev_resume_proc(void * data) > { > + /* Set the global resume flag, this will be checked by the > IO_schedular
Broken mail client.
> + * before dispatching the IO request > + */ > + system_resuming =1;
Add mdelay(1 hour) here. Then try to use your wifi card and your tv grabber.
> device_resume(); > + system_resuming = 0; > +#ifdef DEBUG > + printk(" reseting system_resume \n"); > +#endif
Pavel
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