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Some POWER specific optimizations

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Bug#18842925 : SET THREAD PRIORITY IN INNODB MUTEX SPINLOOP
Like "pause" instruction for hyper-threading at Intel CPUs,
POWER has special instructions only for hinting priority of hardware-threads.

Approved by Sunny in rb#6256

Backport of the 5.7 fix - c92102a6ef
(excluded cache line size patch)

Suggestion by Stewart Smith
This commit is contained in:
Yasufumi Kinoshita 2016-03-30 14:32:20 +11:00 • committed by Daniel Black
parent 2275640deb
commit d4ba50477e
6 changed files with 35 additions and 0 deletions

1
config.h.cmake
View file

@ -225,6 +225,7 @@
#cmakedefine HAVE_PREAD 1
#cmakedefine HAVE_PAUSE_INSTRUCTION 1
#cmakedefine HAVE_FAKE_PAUSE_INSTRUCTION 1
#cmakedefine HAVE_HMT_PRIORITY_INSTRUCTION 1
#cmakedefine HAVE_RDTSCLL 1
#cmakedefine HAVE_READ_REAL_TIME 1
#cmakedefine HAVE_PTHREAD_ATTR_CREATE 1

10
configure.cmake
View file

@ -855,6 +855,16 @@ IF(NOT CMAKE_CROSSCOMPILING AND NOT MSVC)
}
" HAVE_FAKE_PAUSE_INSTRUCTION)
ENDIF()
IF (NOT HAVE_PAUSE_INSTRUCTION)
CHECK_C_SOURCE_COMPILES("
int main()
{
__asm__ __volatile__ (\"or 1,1,1\");
__asm__ __volatile__ (\"or 2,2,2\");
return 0;
}
" HAVE_HMT_PRIORITY_INSTRUCTION)
ENDIF()
ENDIF()
CHECK_SYMBOL_EXISTS(tcgetattr "termios.h" HAVE_TCGETATTR 1)

8
storage/innobase/include/ut0ut.h
View file

@ -92,6 +92,14 @@ private:
# define UT_RELAX_CPU() __asm__ __volatile__ ("":::"memory")
# endif
# if defined(HAVE_HMT_PRIORITY_INSTRUCTION)
# define UT_LOW_PRIORITY_CPU() __asm__ __volatile__ ("or 1,1,1")
# define UT_RESUME_PRIORITY_CPU() __asm__ __volatile__ ("or 2,2,2")
# else
# define UT_LOW_PRIORITY_CPU() ((void)0)
# define UT_RESUME_PRIORITY_CPU() ((void)0)
# endif
/*********************************************************************//**
Delays execution for at most max_wait_us microseconds or returns earlier
if cond becomes true.

4
storage/innobase/ut/ut0ut.cc
View file

@ -401,6 +401,8 @@ ut_delay(
{
ulint i, j;
UT_LOW_PRIORITY_CPU();
j = 0;
for (i = 0; i < delay * 50; i++) {
@ -408,6 +410,8 @@ ut_delay(
UT_RELAX_CPU();
}
UT_RESUME_PRIORITY_CPU();
return(j);
}
#endif /* !UNIV_HOTBACKUP */

8
storage/xtradb/include/ut0ut.h
View file

@ -89,6 +89,14 @@ private:
# define UT_RELAX_CPU() __asm__ __volatile__ ("":::"memory")
# endif
# if defined(HAVE_HMT_PRIORITY_INSTRUCTION)
# define UT_LOW_PRIORITY_CPU() __asm__ __volatile__ ("or 1,1,1")
# define UT_RESUME_PRIORITY_CPU() __asm__ __volatile__ ("or 2,2,2")
# else
# define UT_LOW_PRIORITY_CPU() ((void)0)
# define UT_RESUME_PRIORITY_CPU() ((void)0)
# endif
/*********************************************************************//**
Delays execution for at most max_wait_us microseconds or returns earlier
if cond becomes true.

4
storage/xtradb/ut/ut0ut.cc
View file

@ -402,6 +402,8 @@ ut_delay(
{
ulint i, j;
UT_LOW_PRIORITY_CPU();
j = 0;
for (i = 0; i < delay * 50; i++) {
@ -409,6 +411,8 @@ ut_delay(
UT_RELAX_CPU();
}
UT_RESUME_PRIORITY_CPU();
return(j);
}
#endif /* !UNIV_HOTBACKUP */