AuxXxilium/linux_dsm_epyc7002
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b9a3b4c976
linux_dsm_epyc7002/arch/x86
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Mel Gorman b9a3b4c976 mm, x86: Revisit tlb_flushall_shift tuning for page flushes except on IvyBridge 
There was a large ebizzy performance regression that was
bisected to commit 611ae8e3 (x86/tlb: enable tlb flush range
support for x86).  The problem was related to the
tlb_flushall_shift tuning for IvyBridge which was altered.  The
problem is that it is not clear if the tuning values for each
CPU family is correct as the methodology used to tune the values
is unclear.

This patch uses a conservative tlb_flushall_shift value for all
CPU families except IvyBridge so the decision can be revisited
if any regression is found as a result of this change.
IvyBridge is an exception as testing with one methodology
determined that the value of 2 is acceptable.  Details are in
the changelog for the patch "x86: mm: Change tlb_flushall_shift
for IvyBridge".

One important aspect of this to watch out for is Xen.  The
original commit log mentioned large performance gains on Xen.
It's possible Xen is more sensitive to this value if it flushes
small ranges of pages more frequently than workloads on bare
metal typically do.

Signed-off-by: Mel Gorman <mgorman@suse.de>
Tested-by: Davidlohr Bueso <davidlohr@hp.com>
Reviewed-by: Rik van Riel <riel@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Alex Shi <alex.shi@linaro.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/n/tip-dyzMww3fqugnhbhgo6Gxmtkw@git.kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
2014-01-25 09:10:44 +01:00
..
boot x86, build: Pass in additional -mno-mmx, -mno-sse options 2013-12-09 15:52:39 -08:00
configs x86, defconfig: Add DEVTMPFS and DEVTMPFS_MOUNT to *86*_defconfig 2013-11-04 20:01:55 -08:00
crypto crypto: sha256_ssse3 - also test for BMI2 2013-10-07 14:17:10 +08:00
ia32 constify copy_siginfo_to_user{,32}() 2013-11-09 00:16:29 -05:00
include mm, x86: Account for TLB flushes only when debugging 2014-01-25 09:10:41 +01:00
kernel mm, x86: Revisit tlb_flushall_shift tuning for page flushes except on IvyBridge 2014-01-25 09:10:44 +01:00
kvm KVM: nVMX: Unconditionally uninit the MMU on nested vmexit 2014-01-02 11:22:14 -02:00
lguest
lib ACPI and power management updates for 3.13-rc1 2013-11-14 13:41:48 +09:00
math-emu
mm x86/mm: Eliminate redundant page table walk during TLB range flushing 2014-01-25 09:10:43 +01:00
net net: x86: bpf: don't forget to free sk_filter (v2) 2013-11-07 19:06:52 -05:00
oprofile perf: Fix arch_perf_out_copy_user default 2013-11-06 12:34:25 +01:00
pci ACPI / driver core: Store an ACPI device pointer in struct acpi_dev_node 2013-11-14 23:14:43 +01:00
platform x86, efi: Don't use (U)EFI time services on 32 bit 2013-12-10 15:02:34 -08:00
power
realmode x86, build: Pass in additional -mno-mmx, -mno-sse options 2013-12-09 15:52:39 -08:00
syscalls
tools
um Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml 2013-11-19 11:42:32 -08:00
vdso seqcount: Add lockdep functionality to seqcount/seqlock structures 2013-11-06 12:40:26 +01:00
video
xen Features: 2013-11-15 13:34:37 +09:00
.gitignore
Kbuild
Kconfig x86, doc, kconfig: Fix dud URL for Microcode data 2014-01-20 10:12:29 -08:00
Kconfig.cpu
Kconfig.debug x86/efi: Add EFI framebuffer earlyprintk support 2013-10-28 18:09:58 +00:00
Makefile x86, build: Pass in additional -mno-mmx, -mno-sse options 2013-12-09 15:52:39 -08:00
Makefile_32.cpu
Makefile.um