Chris Wilson 1f1a89ac05 x86/mm: Micro-optimise clflush_cache_range() ...

Whilst inspecting the asm for clflush_cache_range() and some perf profiles
that required extensive flushing of single cachelines (from part of the
intel-gpu-tools GPU benchmarks), we noticed that gcc was reloading
boot_cpu_data.x86_clflush_size on every iteration of the loop. We can
manually hoist that read which perf regarded as taking ~25% of the
function time for a single cacheline flush.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Acked-by: "H. Peter Anvin" <hpa@zytor.com>
Cc: Toshi Kani <toshi.kani@hpe.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>
Cc: Sai Praneeth <sai.praneeth.prakhya@intel.com>
Link: http://lkml.kernel.org/r/1452246933-10890-1-git-send-email-chris@chris-wilson.co.uk
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

2016-01-08 19:27:39 +01:00

..

kmemcheck

x86: Replace __get_cpu_var uses

2014-08-26 13:45:49 -04:00

amdtopology.c

x86/mm/numa: Simplify some bit mangling

2013-04-10 19:06:26 +02:00

debug_pagetables.c

x86/mm/ptdump: Make (debugfs)/kernel_page_tables read-only

2015-12-04 12:55:01 +01:00

dump_pagetables.c

x86/mm: Turn CONFIG_X86_PTDUMP into a module

2015-11-23 10:50:13 +01:00

extable.c

x86, extable: Switch to relative exception table entries

2012-04-20 17:22:34 -07:00

fault.c

x86/vm86: Clean up vm86.h includes

2015-07-31 13:31:10 +02:00

gup.c

x86/mm: Fix gup_huge_p?d() to handle large PAT bit

2015-09-22 21:27:33 +02:00

highmem_32.c

kmap_atomic_to_page() has no users, remove it

2015-11-09 15:11:24 -08:00

hugetlbpage.c

mm/hugetlb: pmd_huge() returns true for non-present hugepage

2015-02-11 17:06:01 -08:00

init_32.c

x86/mm: Warn on W^X mappings

2015-10-06 11:11:48 +02:00

init_64.c

Merge tag 'libnvdimm-for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

2015-11-10 12:07:22 -08:00

init.c

Merge tag 'libnvdimm-for-4.4' of git://git.kernel.org/pub/scm/linux/kernel/git/nvdimm/nvdimm

2015-11-10 12:07:22 -08:00

iomap_32.c

Merge branch 'x86-core-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

2015-06-22 17:59:09 -07:00

ioremap.c

x86/mm: Drop WARN from multi-BAR check

2015-12-29 12:34:38 +01:00

kasan_init_64.c

kasan: update log messages

2015-11-05 19:34:48 -08:00

kmmio.c

x86: Delete non-required instances of include <linux/init.h>

2014-01-06 21:25:18 -08:00

Makefile

x86/mm: Turn CONFIG_X86_PTDUMP into a module

2015-11-23 10:50:13 +01:00

mm_internal.h

x86: Enable PAT to use cache mode translation tables

2014-11-16 11:04:26 +01:00

mmap.c

x86/mpx: Do not set ->vm_ops on MPX VMAs

2015-07-21 07:57:16 +02:00

mmio-mod.c

x86: delete __cpuinit usage from all x86 files

2013-07-14 19:36:56 -04:00

mpx.c

x86/mpx: Fix 32-bit address space calculation

2015-11-12 09:20:37 +01:00

numa_32.c

x86: Fix the initialization of physnode_map

2014-02-01 22:15:51 -08:00

numa_64.c

x86, mm: kill numa_free_all_bootmem()

2012-11-17 11:59:47 -08:00

numa_emulation.c

x86: delete __cpuinit usage from all x86 files

2013-07-14 19:36:56 -04:00

numa_internal.h

x86-32, mm: Rip out x86_32 NUMA remapping code

2013-01-31 14:12:30 -08:00

numa.c

mem-hotplug: handle node hole when initializing numa_meminfo.

2015-09-08 15:35:28 -07:00

pageattr-test.c

x86/mm/pat: Make mm/pageattr[-test].c explicitly non-modular

2015-08-25 09:48:38 +02:00

pageattr.c

x86/mm: Micro-optimise clflush_cache_range()

2016-01-08 19:27:39 +01:00

pat_internal.h

x86/mm/pat: Convert to pr_*() usage

2015-05-27 14:40:59 +02:00

pat_rbtree.c

x86/mm/pat: Change free_memtype() to support shrinking case

2016-01-05 11:10:23 +01:00

pat.c

x86/mm/pat: Change free_memtype() to support shrinking case

2016-01-05 11:10:23 +01:00

pf_in.c

x86: Eliminate various 'set but not used' warnings

2011-05-21 19:10:33 +02:00

pf_in.h

x86 mmiotrace: move files into arch/x86/mm/.

2008-05-24 11:25:37 +02:00

pgtable_32.c

x86: Remove set_pmd_pfn

2014-09-01 10:15:31 +02:00

pgtable.c

x86/mm/mtrr: Enhance MTRR checks in kernel mapping helpers

2015-05-27 14:40:58 +02:00

physaddr.c

x86, mm: Make DEBUG_VIRTUAL work earlier in boot

2013-01-25 16:33:22 -08:00

physaddr.h

x86: split __phys_addr out into separate file

2009-09-10 11:48:55 -07:00

setup_nx.c

x86: delete __cpuinit usage from all x86 files

2013-07-14 19:36:56 -04:00

srat.c

x86/mm: Introduce max_possible_pfn

2015-12-06 12:46:31 +01:00

testmmiotrace.c

x86, kmmio/mmiotrace: Fix double free of kmmio_fault_pages

2010-06-18 11:30:09 +02:00

tlb.c

x86, mm: trace when an IPI is about to be sent

2015-09-04 16:54:41 -07:00