On Wednesday, June 19, 2013 11:26:13 AM Xiaoguang Chen wrote: > 2013/6/19 Viresh Kumar <[email protected]>: > > On 19 June 2013 08:43, Viresh Kumar <[email protected]> wrote: > >> On 19 June 2013 06:50, Xiaoguang Chen <[email protected]> wrote: > >>> 2013/6/19 Rafael J. Wysocki <[email protected]>: > >> > >>>>> 2) Current governor is userspace, now cpu0 hotplugs in cpu3, it will > >>>> > >>>> Can you please tell me what the above is supposed to mean? Is it > >>>> supposed to > >>>> mean "the online of cpu3 is being run on cpu0" or something different? > >>>> If > >>>> something different, then what? > > Sorry I missed this question, Let me explain it in detail > Suppose we are in such condtition, current cpufreq goveror is > userspace governor. cpu3 is offline. > and two things happen as above two cases, first thing is application > tries to change current governor to ondemand governor, > second thing is cpu0 tries to make cpu3 online which is off line > before. both of these two cases will try to stop current governor and > start a governor. if above two things interleave, unexpected behavior > will happen.
Now it's clear, thanks for the explanation. [Well, I'll still need to fix up the changelog. Sigh.] Thanks, Rafael -- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center. -- 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/
