Peter Zijlstra 0f004f5a69 sched: Cure more NO_HZ load average woes ... There's a long-running regression that proved difficult to fix and which is hitting certain people and is rather annoying in its effects. Damien reported that after 74f5187ac8 (sched: Cure load average vs NO_HZ woes) his load average is unnaturally high, he also noted that even with that patch reverted the load avgerage numbers are not correct. The problem is that the previous patch only solved half the NO_HZ problem, it addressed the part of going into NO_HZ mode, not of comming out of NO_HZ mode. This patch implements that missing half. When comming out of NO_HZ mode there are two important things to take care of: - Folding the pending idle delta into the global active count. - Correctly aging the averages for the idle-duration. So with this patch the NO_HZ interaction should be complete and behaviour between CONFIG_NO_HZ=[yn] should be equivalent. Furthermore, this patch slightly changes the load average computation by adding a rounding term to the fixed point multiplication. Reported-by: Damien Wyart <damien.wyart@free.fr> Reported-by: Tim McGrath <tmhikaru@gmail.com> Tested-by: Damien Wyart <damien.wyart@free.fr> Tested-by: Orion Poplawski <orion@cora.nwra.com> Tested-by: Kyle McMartin <kyle@mcmartin.ca> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> Cc: stable@kernel.org Cc: Chase Douglas <chase.douglas@canonical.com> LKML-Reference: <1291129145.32004.874.camel@laptop> Signed-off-by: Ingo Molnar <mingo@elte.hu>		2010-12-08 20:15:04 +01:00
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acpi	Merge branch 'misc' into release	2010-10-26 14:51:00 -04:00
asm-generic	asm-generic/stat.h: support 64-bit file time_t for stat()	2010-11-01 15:31:29 -04:00
crypto	Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial	2010-10-24 13:41:39 -07:00
drm	drm/i915: announce to userspace that the bsd ring is coherent	2010-12-05 10:40:39 +00:00
keys
linux	sched: Cure more NO_HZ load average woes	2010-12-08 20:15:04 +01:00
math-emu
media	[media] v4l: Remove module_name argument to the v4l2_i2c_new_subdev* functions	2010-11-22 11:56:26 -02:00
mtd	mtd: Define MLC Flash as a different flash type	2010-10-25 00:50:20 +01:00
net	af_unix: limit recursion level	2010-11-29 09:45:15 -08:00
pcmcia	pcmcia: IOCARD is also required for using IRQs	2010-10-22 08:46:36 +02:00
rdma	IB/core: Add VLAN support for IBoE	2010-10-25 10:20:39 -07:00
rxrpc
scsi	SCSI host lock push-down	2010-11-16 13:33:23 -08:00
sound	ARM: mach-shmobile: ap4evb: FSI clock use proper process for HDMI	2010-11-24 15:29:56 +09:00
trace	ext4: Add new ext4 inode tracepoints	2010-11-08 13:51:33 -05:00
video	fbdev: da8xx: punt duplicated FBIO_WAITFORVSYNC define	2010-11-16 10:14:22 +09:00
xen	xen: fix MSI setup and teardown for PV on HVM guests	2010-12-02 14:34:25 +00:00
Kbuild