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Implementing opt.background_thread.

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Added opt.background_thread to enable background threads, which handles purging
currently.  When enabled, decay ticks will not trigger purging (which will be
left to the background threads).  We limit the max number of threads to NCPUs.
When percpu arena is enabled, set CPU affinity for the background threads as
well.

The sleep interval of background threads is dynamic and determined by computing
number of pages to purge in the future (based on backlog).
This commit is contained in:
Qi Wang
2017-03-17 12:42:33 -07:00
committed by Qi Wang
parent 3f685e8824
commit b693c7868e
23 changed files with 1245 additions and 348 deletions
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32
configure.ac
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@@ -1443,12 +1443,23 @@ dnl ============================================================================
dnl Configure pthreads.
if test "x$abi" != "xpecoff" ; then
AC_DEFINE([JEMALLOC_HAVE_PTHREAD], [ ])
AC_CHECK_HEADERS([pthread.h], , [AC_MSG_ERROR([pthread.h is missing])])
dnl Some systems may embed pthreads functionality in libc; check for libpthread
dnl first, but try libc too before failing.
AC_CHECK_LIB([pthread], [pthread_create], [JE_APPEND_VS(LIBS, -lpthread)],
[AC_SEARCH_LIBS([pthread_create], , ,
AC_MSG_ERROR([libpthread is missing]))])
wrap_syms="${wrap_syms} pthread_create"
dnl Check if we have dlsym support.
have_dlsym="1"
AC_CHECK_HEADERS([dlfcn.h],
AC_CHECK_FUNC([dlsym], [],
[AC_CHECK_LIB([dl], [dlsym], [LIBS="$LIBS -ldl"], [have_dlsym="0"])]),
[have_dlsym="0"])
if test "x$have_dlsym" = "x1" ; then
AC_DEFINE([JEMALLOC_HAVE_DLSYM], [ ])
fi
JE_COMPILABLE([pthread_atfork(3)], [
#include <pthread.h>
], [
@@ -1563,6 +1574,15 @@ if test "x$have_sched_getcpu" = "x1" ; then
AC_DEFINE([JEMALLOC_HAVE_SCHED_GETCPU], [ ])
fi
dnl Check if the GNU-specific sched_setaffinity function exists.
AC_CHECK_FUNC([sched_setaffinity],
[have_sched_setaffinity="1"],
[have_sched_setaffinity="0"]
)
if test "x$have_sched_setaffinity" = "x1" ; then
AC_DEFINE([JEMALLOC_HAVE_SCHED_SETAFFINITY], [ ])
fi
dnl Check if the Solaris/BSD issetugid function exists.
AC_CHECK_FUNC([issetugid],
[have_issetugid="1"],
@@ -1623,15 +1643,11 @@ if test "x${enable_lazy_lock}" = "x1" -a "x${abi}" = "xpecoff" ; then
enable_lazy_lock="0"
fi
if test "x$enable_lazy_lock" = "x1" ; then
if test "x$abi" != "xpecoff" ; then
AC_CHECK_HEADERS([dlfcn.h], , [AC_MSG_ERROR([dlfcn.h is missing])])
AC_CHECK_FUNC([dlsym], [],
[AC_CHECK_LIB([dl], [dlsym], [JE_APPEND_VS(LIBS, -ldl)],
[AC_MSG_ERROR([libdl is missing])])
])
if test "x$have_dlsym" = "x1" ; then
AC_DEFINE([JEMALLOC_LAZY_LOCK], [ ])
else
AC_MSG_ERROR([Missing dlsym support: lazy-lock cannot be enabled.])
fi
AC_DEFINE([JEMALLOC_LAZY_LOCK], [ ])
wrap_syms="${wrap_syms} pthread_create"
fi
AC_SUBST([enable_lazy_lock])