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x86/asm: Optimize clear_page() 

Currently, we CALL clear_page() which then JMPs to the proper function
chosen by the alternatives.

What we should do instead is CALL the proper function directly. (This
was something Ingo suggested a while ago). So let's do that.

Measuring our favourite kernel build workload shows that there are no
significant changes in performance.

AMD
===
  -- /tmp/before 2017-02-09 18:01:46.451961188 +0100
  ++ /tmp/after  2017-02-09 18:01:54.883961175 +0100
  @@ -1,15 +1,15 @@
    Performance counter stats for 'system wide' (5 runs):

  -    1028960.373643      cpu-clock (msec)          #    6.000 CPUs utilized            ( +-  1.41% )
  +    1023086.018961      cpu-clock (msec)          #    6.000 CPUs utilized            ( +-  1.20% )
  -           518,744      context-switches          #    0.504 K/sec                    ( +-  1.04% )
  +           518,254      context-switches          #    0.507 K/sec                    ( +-  1.01% )
  -            38,112      cpu-migrations            #    0.037 K/sec                    ( +-  1.95% )
  +            37,917      cpu-migrations            #    0.037 K/sec                    ( +-  1.02% )
  -        20,874,266      page-faults               #    0.020 M/sec                    ( +-  0.07% )
  +        20,918,897      page-faults               #    0.020 M/sec                    ( +-  0.18% )
  - 2,043,646,230,667      cycles                    #    1.986 GHz                      ( +-  0.14% )  (66.67%)
  + 2,045,305,584,032      cycles                    #    1.999 GHz                      ( +-  0.16% )  (66.67%)
  -   553,698,855,431      stalled-cycles-frontend   #   27.09% frontend cycles idle     ( +-  0.07% )  (66.67%)
  +   555,099,401,413      stalled-cycles-frontend   #   27.14% frontend cycles idle     ( +-  0.13% )  (66.67%)
  -   621,544,286,390      stalled-cycles-backend    #   30.41% backend cycles idle      ( +-  0.39% )  (66.67%)
  +   621,371,430,254      stalled-cycles-backend    #   30.38% backend cycles idle      ( +-  0.32% )  (66.67%)
  - 1,738,364,431,659      instructions              #    0.85  insn per cycle
  + 1,739,895,771,901      instructions              #    0.85  insn per cycle
  -                                                  #    0.36  stalled cycles per insn  ( +-  0.11% )  (66.67%)
  +                                                  #    0.36  stalled cycles per insn  ( +-  0.13% )  (66.67%)
  -   391,170,943,850      branches                  #  380.161 M/sec                    ( +-  0.13% )  (66.67%)
  +   391,398,551,757      branches                  #  382.567 M/sec                    ( +-  0.13% )  (66.67%)
  -    22,567,810,411      branch-misses             #    5.77% of all branches          ( +-  0.11% )  (66.67%)
  +    22,574,726,683      branch-misses             #    5.77% of all branches          ( +-  0.13% )  (66.67%)

  -     171.480741921 seconds time elapsed                                          ( +-  1.41% )
  +     170.509229451 seconds time elapsed                                          ( +-  1.20% )

Intel
=====

  -- /tmp/before 2017-02-09 20:36:19.851947473 +0100
  ++ /tmp/after  2017-02-09 20:36:30.151947458 +0100
  @@ -1,15 +1,15 @@
    Performance counter stats for 'system wide' (5 runs):

  -    2207248.598126      cpu-clock (msec)          #    8.000 CPUs utilized            ( +-  0.69% )
  +    2213300.106631      cpu-clock (msec)          #    8.000 CPUs utilized            ( +-  0.73% )
  -           899,342      context-switches          #    0.407 K/sec                    ( +-  0.68% )
  +           898,381      context-switches          #    0.406 K/sec                    ( +-  0.79% )
  -            80,553      cpu-migrations            #    0.036 K/sec                    ( +-  1.13% )
  +            80,979      cpu-migrations            #    0.037 K/sec                    ( +-  1.11% )
  -        36,171,148      page-faults               #    0.016 M/sec                    ( +-  0.02% )
  +        36,179,791      page-faults               #    0.016 M/sec                    ( +-  0.02% )
  - 6,665,288,826,484      cycles                    #    3.020 GHz                      ( +-  0.07% )  (83.33%)
  + 6,671,638,410,799      cycles                    #    3.014 GHz                      ( +-  0.06% )  (83.33%)
  - 5,065,975,115,197      stalled-cycles-frontend   #   76.01% frontend cycles idle     ( +-  0.11% )  (83.33%)
  + 5,076,835,183,223      stalled-cycles-frontend   #   76.10% frontend cycles idle     ( +-  0.11% )  (83.33%)
  - 3,841,556,350,614      stalled-cycles-backend    #   57.64% backend cycles idle      ( +-  0.13% )  (66.67%)
  + 3,852,823,974,333      stalled-cycles-backend    #   57.75% backend cycles idle      ( +-  0.12% )  (66.67%)
  - 4,148,398,171,079      instructions              #    0.62  insn per cycle
  + 4,148,997,156,059      instructions              #    0.62  insn per cycle
  -                                                  #    1.22  stalled cycles per insn  ( +-  0.10% )  (83.33%)
  +                                                  #    1.22  stalled cycles per insn  ( +-  0.11% )  (83.33%)
  -   887,187,118,591      branches                  #  401.943 M/sec                    ( +-  0.09% )  (83.33%)
  +   887,271,341,121      branches                  #  400.882 M/sec                    ( +-  0.11% )  (83.33%)
  -    30,139,439,034      branch-misses             #    3.40% of all branches          ( +-  0.09% )  (83.33%)
  +    30,134,864,997      branch-misses             #    3.40% of all branches          ( +-  0.06% )  (83.33%)

  -     275.904405540 seconds time elapsed                                          ( +-  0.69% )
  +     276.660352016 seconds time elapsed                                          ( +-  0.73% )

allmodconfig vmlinux size grows by a ~1Kb but that's fine - we optimize
our calling of the clear_page variants.

     text    data     bss     dec     hex filename
  9051979 23067670        27009024        59128673        3863b61		vmlinux
  9053000 23067670        27009024        59129694        3863f5e		vmlinux.clear_page

Reported-by: kernel test robot <fengguang.wu@intel.com>
Tested-by: Fengguang Wu <fengguang.wu@intel.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20170215111927.emdgxf2pide3kwro@pd.tnic
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Borislav Petkov 2017-02-09 01:34:49 +01:00 committed by Ingo Molnar
parent 2140a9942b
commit f25d384755
2 changed files with 22 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
arch/x86/include/asm/page_64.h
View File

@ -4,6 +4,7 @@
#include <asm/page_64_types.h> #include <asm/page_64_types.h>
#ifndef __ASSEMBLY__ #ifndef __ASSEMBLY__
#include <asm/alternative.h>
/* duplicated to the one in bootmem.h */ /* duplicated to the one in bootmem.h */
extern unsigned long max_pfn; extern unsigned long max_pfn;
@ -34,7 +35,20 @@ extern unsigned long __phys_addr_symbol(unsigned long);
#define pfn_valid(pfn) ((pfn) < max_pfn) #define pfn_valid(pfn) ((pfn) < max_pfn)
#endif #endif
void clear_page(void *page); void clear_page_orig(void *page);
void clear_page_rep(void *page);
void clear_page_erms(void *page);
static inline void clear_page(void *page)
{
alternative_call_2(clear_page_orig,
clear_page_rep, X86_FEATURE_REP_GOOD,
clear_page_erms, X86_FEATURE_ERMS,
"=D" (page),
"0" (page)
: "memory", "rax", "rcx");
}
void copy_page(void *to, void *from); void copy_page(void *to, void *from);
#endif /* !__ASSEMBLY__ */ #endif /* !__ASSEMBLY__ */

17
arch/x86/lib/clear_page_64.S
View File

@ -14,20 +14,15 @@
* Zero a page. * Zero a page.
* %rdi - page * %rdi - page
*/ */
ENTRY(clear_page) ENTRY(clear_page_rep)
ALTERNATIVE_2 "jmp clear_page_orig", "", X86_FEATURE_REP_GOOD, \
"jmp clear_page_c_e", X86_FEATURE_ERMS
movl $4096/8,%ecx movl $4096/8,%ecx
xorl %eax,%eax xorl %eax,%eax
rep stosq rep stosq
ret ret
ENDPROC(clear_page) ENDPROC(clear_page_rep)
EXPORT_SYMBOL(clear_page) EXPORT_SYMBOL_GPL(clear_page_rep)
ENTRY(clear_page_orig) ENTRY(clear_page_orig)
xorl %eax,%eax xorl %eax,%eax
movl $4096/64,%ecx movl $4096/64,%ecx
.p2align 4 .p2align 4
@ -47,10 +42,12 @@ ENTRY(clear_page_orig)
nop nop
ret ret
ENDPROC(clear_page_orig) ENDPROC(clear_page_orig)
EXPORT_SYMBOL_GPL(clear_page_orig)
ENTRY(clear_page_c_e) ENTRY(clear_page_erms)
movl $4096,%ecx movl $4096,%ecx
xorl %eax,%eax xorl %eax,%eax
rep stosb rep stosb
ret ret
ENDPROC(clear_page_c_e) ENDPROC(clear_page_erms)
EXPORT_SYMBOL_GPL(clear_page_erms)