kernel news – 03.12.2013

Posted: December 3, 2013 in kernel

-Arnaldo Carvalho de Melo has perf/core improvements and fixes :

. Honour -m option in ‘trace’, the tool was offering the option to
set the mmap size, but wasn’t using it when doing the actual mmap
on the events file descriptors, fix from Jiri Olsa.

. Correct the message in feature-libnuma checking, swowing the right
devel package names for various distros, from Dongsheng Yang.

. Polish ‘readn’ function and introduce its counterpart, ‘writen’, from
Jiri Olsa.

. Start moving timechart state from global variables to a ‘perf_tool’ derived
‘timechart’ struct.

-Thomas Gleixner has timer fixes for 3.13 :

– timekeeping: Cure a subtle drift issue on GENERIC_TIME_VSYSCALL_OLD
– nohz: Make CONFIG_NO_HZ=n and nohz=off command line option behave
the same way. Fixes a long standing load accounting wreckage.
– clocksource/ARM: Kconfig update to avoid ARM=n wreckage
– clocksource/ARM: Fixlets for the AT91 and SH clocksource/clockevents
– Trivial documentation update and kzalloc conversion from akpms pile

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