linux/arch/powerpc
Vaidyanathan Srinivasan 363edbe261 powerpc: Default arch idle could cede processor on pseries
When adding cpuidle support to pSeries, we introduced two
regressions:

  - The new cpuidle backend driver only works under hypervisors
    supporting the "SLPLAR" option, which isn't the case of the
    old POWER4 hypervisor and the HV "light" used on js2x blades

  - The cpuidle driver registers fairly late, meaning that for
    a significant portion of the boot process, we end up having
    all threads spinning. This slows down the boot process and
    increases the overall resource usage if the hypervisor has
    shared processors.

This fixes both by implementing a "default" idle that will cede
to the hypervisor when possible, in a very simple way without
all the bells and whisles of cpuidle.

Reported-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Vaidyanathan Srinivasan <svaidy@linux.vnet.ibm.com>
Acked-by: Deepthi Dharwar <deepthi@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
CC: <stable@vger.kernel.org>
2013-09-11 11:41:54 +10:00
..
boot Merge remote-tracking branch 'agust/next' into next 2013-09-05 16:43:30 +10:00
configs powerpc/85xx: Add C293PCIE board support 2013-08-23 19:43:24 -05:00
crypto powerpc: Fix compile of sha1-powerpc-asm.S on 32-bit 2013-03-05 16:56:26 +11:00
include ARM: SoC platform changes for 3.12 2013-09-06 13:30:06 -07:00
kernel powerpc: Fix section mismatch warning for prom_rtas_call 2013-09-11 11:39:38 +10:00
kvm Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-09-06 10:49:42 -07:00
lib powerpc: Unaligned stores and stmw are broken in emulation code 2013-08-27 14:36:08 +10:00
math-emu powerpc/math-emu: Fix load/store indexed emulation 2013-08-14 14:59:57 +10:00
mm powerpc: Fix possible deadlock on page fault 2013-09-11 11:39:37 +10:00
net ppc: bpf_jit: can call module_free() from any context 2013-05-20 14:03:50 -07:00
oprofile Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-09-06 10:49:42 -07:00
perf Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-09-06 10:49:42 -07:00
platforms powerpc: Default arch idle could cede processor on pseries 2013-09-11 11:41:54 +10:00
sysdev Merge branch 'next' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc 2013-09-06 10:49:42 -07:00
xmon powerpc/xmon: Fix printing of set of CPUs in xmon 2013-09-05 17:29:19 +10:00
Kconfig ARM: SoC platform changes for 3.12 2013-09-06 13:30:06 -07:00
Kconfig.debug Merge branch 'kconfig-diet' from Dave Hansen 2013-07-04 11:25:51 -07:00
Makefile powerpc/e500: Set -mcpu flag for 32-bit e500 2013-08-20 20:49:56 -05:00
relocs_check.pl Fix warning typo "CONFIG_RELCOATABLE" 2013-05-29 15:11:30 +02:00