On Sat, Jun 21, 2014 at 2:50 PM, Pavel Machek pavel@ucw.cz wrote:
On Sat 2014-06-21 14:22:59, Ilia Mirkin wrote:
On Sat, Jun 21, 2014 at 2:02 PM, Pavel Machek pavel@ucw.cz wrote:
Hi!
AFAICT, pstate file will contain something like
07: core 100 MHz memory 123 MHz * 08: core 100-200 MHz memory 123 MHz
...which does not look exactly like one-value-per-file, and I'm pretty sure userspace will get it wrong if it tries to parse it. Plus, I don't see required documentation in Documentation/ABI.
...
FTR, this file has been in place since 3.13, and there was a different file before it (performance_levels), with a comparable format since much earlier (definitely 3.8, probably earlier). I think it's meant a
According to the article, it is only starting to work now. I know articles can be wrong, but I don't have that hardware... Sorry if it is the case.
Commit 26fdd78cce3f51a49e1f2d3ad27ee893a28d220e introduced this particular one. Commit 330c5988ee78045e6a731c3693251aaa5b0d14e3 had introduced the former version, which was removed in 3.13, replaced with the new one.
lot more for people looking at it and echo'ing stuff to it to modify the levels (where supported), than for programs parsing it. Perhaps sysfs is the wrong place for this -- what is the right place? debugfs?
debugfs would work, yes. Pavel -- (english) http://www.livejournal.com/~pavelmachek (cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html