linux_dsm_epyc7002/include
Ingo Molnar e4e4e534fa sched clock: revert various sched_clock() changes
Found an interactivity problem on a quad core test-system - simple
CPU loops would occasionally delay the system un an unacceptable way.

After much debugging with Peter Zijlstra it turned out that the problem
is caused by the string of sched_clock() changes - they caused the CPU
clock to jump backwards a bit - which confuses the scheduler arithmetics.

(which is unsigned for performance reasons)

So revert:

 # c300ba2: sched_clock: and multiplier for TSC to gtod drift
 # c0c8773: sched_clock: only update deltas with local reads.
 # af52a90: sched_clock: stop maximum check on NO HZ
 # f7cce27: sched_clock: widen the max and min time

This solves the interactivity problems.

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Acked-by: Mike Galbraith <efault@gmx.de>
2008-07-31 17:20:29 +02:00
..
acpi PCI: disable ASPM per ACPI FADT setting 2008-07-28 14:56:09 -07:00
asm-alpha
asm-arm Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2008-07-28 18:14:24 -07:00
asm-avr32 Merge commit 'upstream/master' 2008-07-27 13:54:08 +02:00
asm-blackfin
asm-cris Merge branch 'linus' into core/generic-dma-coherent 2008-07-29 00:07:55 +02:00
asm-frv
asm-generic Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6 2008-07-28 18:14:24 -07:00
asm-h8300
asm-ia64
asm-m32r
asm-m68k
asm-m68knommu
asm-mips
asm-mn10300
asm-parisc
asm-powerpc powerpc/mm: Implement _PAGE_SPECIAL & pte_special() for 64-bit 2008-07-28 16:30:52 +10:00
asm-s390 KVM: s390: Fix instruction naming for lctlg 2008-07-27 11:36:12 +03:00
asm-sh Merge branch 'linus' into core/generic-dma-coherent 2008-07-29 00:07:55 +02:00
asm-um
asm-x86 Merge branch 'linus' into core/generic-dma-coherent 2008-07-29 00:07:55 +02:00
asm-xtensa
crypto
drm
keys
linux sched clock: revert various sched_clock() changes 2008-07-31 17:20:29 +02:00
math-emu
media V4L/DVB (8525): fix a few assorted spelling mistakes. 2008-07-27 11:07:13 -03:00
mtd
net missing bits of net-namespace / sysctl 2008-07-27 09:45:34 -07:00
pcmcia
rdma
rxrpc
scsi [SCSI] extend the last_sector_bug flag to cover more sectors 2008-07-27 10:16:13 -04:00
sound
video
xen
Kbuild