On Nov 16, 2010, at 6:31 PM, Anton Blanchard wrote: > In order to add per process control of the DSCR, the following patch emulates > read/write of the DSCR from userspace and saves and restores it on context > switch. We add emulated stats to track how many times we do this. > > While writing this patch a few things were apparent: > > - How will this work with the global DSCR setting in > /sys/devices/system/cpu/cpu*/dscr? Do we deprecate it? One thought is > to add a new sysfs entry (eg dscr_enabled), which tells us to > override any per process settings. Another way would be to overload > the dscr sysfs entry and make -1 mean the system wide dscr setting is > disabled. > > - Do we need an out of band method of changing the DSCR so another > process or could modify it? We may want to modify the DSCR of a long > running process, eg a HPC job. > > - To improve context switch speed we should probably check the old and > new DSCR values are identical and avoid the SPR write. > > Signed-off-by: Anton Blanchard <an...@samba.org>
We don't have no stinking DSCR ;). Would like this to be #ifdef CONFIG_PPC_BOOK3S_64. - k _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@lists.ozlabs.org https://lists.ozlabs.org/listinfo/linuxppc-dev
