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https://github.com/jemalloc/jemalloc.git
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Add experimental support for usdt systemtap probes
This commit is contained in:
Slobodan Predolac
Guangli Dai
parent
5847516692
commit
711fff750c
5 changed files with 266 additions and 0 deletions
49
configure.ac
49
configure.ac
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@ -1681,6 +1681,55 @@ else
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fi
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AC_SUBST([enable_utrace])
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dnl Disable experimental sdt tracing by default.
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AC_ARG_ENABLE([experimental-sdt],
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[AS_HELP_STRING([--enable-experimental-sdt], [Enable systemtap USDT probes])],
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[if test "x$enable_experimental_sdt" = "xno" ; then
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enable_experimental_sdt="0"
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else
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JE_COMPILABLE([systemtap sdt], [
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#include <sys/sdt.h>
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], [
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void foo(int i, void *p) { STAP_PROBE2(jemalloc, test, i, p); }
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],
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[je_cv_stap_sdt])
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if test "x${je_cv_stap_sdt}" = "xyes" ; then
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enable_experimental_sdt="1"
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elif test "x${abi}" = "xelf" ; then
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case "${host}" in
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*-*-linux-android*)
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case "${host_cpu}" in aarch64|x86_64)
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enable_experimental_sdt="2"
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;;
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esac
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;;
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*-*-linux*)
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case "${host_cpu}" in x86_64|aarch64|arm*)
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enable_experimental_sdt="2"
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;;
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esac
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;;
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*)
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enable_experimental_sdt="0"
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AC_MSG_ERROR([Unsupported sdt on this platform])
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;;
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esac
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else
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AC_MSG_ERROR([Unsupported sdt on this platform])
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fi
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fi
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],
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[enable_experimental_sdt="0"]
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)
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if test "x$enable_experimental_sdt" = "x1" ; then
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AC_DEFINE([JEMALLOC_EXPERIMENTAL_USDT_STAP], [ ], [ ])
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elif test "x$enable_experimental_sdt" = "x2"; then
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AC_DEFINE([JEMALLOC_EXPERIMENTAL_USDT_CUSTOM], [ ], [ ])
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fi
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AC_SUBST([enable_experimental_sdt])
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dnl Do not support the xmalloc option by default.
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AC_ARG_ENABLE([xmalloc],
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[AS_HELP_STRING([--enable-xmalloc], [Support xmalloc option])],
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@ -353,6 +353,15 @@
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/* Defined if mprotect(2) is available. */
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#undef JEMALLOC_HAVE_MPROTECT
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/* Defined if sys/sdt.h is available and sdt tracing enabled */
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#undef JEMALLOC_EXPERIMENTAL_USDT_STAP
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/*
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* Defined if sys/sdt.h is unavailable, sdt tracing enabled, and
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* platform is supported
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*/
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#undef JEMALLOC_EXPERIMENTAL_USDT_CUSTOM
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/*
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* Defined if transparent huge pages (THPs) are supported via the
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* MADV_[NO]HUGEPAGE arguments to madvise(2), and THP support is enabled.
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49
include/jemalloc/internal/jemalloc_probe.h
Normal file
49
include/jemalloc/internal/jemalloc_probe.h
Normal file
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@ -0,0 +1,49 @@
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#ifndef JEMALLOC_INTERNAL_JEMALLOC_PROBE_H
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#define JEMALLOC_INTERNAL_JEMALLOC_PROBE_H
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#include <jemalloc/internal/jemalloc_preamble.h>
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#ifdef JEMALLOC_EXPERIMENTAL_USDT_STAP
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#include <jemalloc/internal/jemalloc_probe_stap.h>
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#elif defined(JEMALLOC_EXPERIMENTAL_USDT_CUSTOM)
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#include <jemalloc/internal/jemalloc_probe_custom.h>
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#elif defined(_MSC_VER)
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#define JE_USDT(name, N, ...) /* Nothing */
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#else /* no USDT, just check the args */
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#define JE_USDT(name, N, ...) _JE_USDT_CHECK_ARG##N(__VA_ARGS__)
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#define _JE_USDT_CHECK_ARG1(a) \
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do { \
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(void)(a); \
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} while (0)
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#define _JE_USDT_CHECK_ARG2(a, b) \
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do { \
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(void)(a); \
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(void)(b); \
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} while (0)
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#define _JE_USDT_CHECK_ARG3(a, b, c) \
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do { \
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(void)(a); \
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(void)(b); \
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(void)(c); \
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} while (0)
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#define _JE_USDT_CHECK_ARG4(a, b, c, d) \
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do { \
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(void)(a); \
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(void)(b); \
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(void)(c); \
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(void)(d); \
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} while (0)
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#define _JE_USDT_CHECK_ARG5(a, b, c, d, e) \
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do { \
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(void)(a); \
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(void)(b); \
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(void)(c); \
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(void)(d); \
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(void)(e); \
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} while (0)
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#endif /* JEMALLOC_EXPERIMENTAL_USDT_* */
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#endif /* JEMALLOC_INTERNAL_JEMALLOC_PROBE_H */
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148
include/jemalloc/internal/jemalloc_probe_custom.h
Normal file
148
include/jemalloc/internal/jemalloc_probe_custom.h
Normal file
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@ -0,0 +1,148 @@
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#ifndef JEMALLOC_INTERNAL_JEMALLOC_PROBE_CUSTOM_H
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#define JEMALLOC_INTERNAL_JEMALLOC_PROBE_CUSTOM_H
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/* clang-format off */
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/*
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* This section is based on sys/sdt.h and
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* https://sourceware.org/systemtap/wiki/UserSpaceProbeImplementation
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*/
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/* Emit NOP for the probe. */
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#if (defined(__x86_64__) || defined(__i386__) || defined(__aarch64__) || \
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defined(__arm__)) && defined(__linux__)
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#define JE_SDT_NOP nop
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#else
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#error "Architecture not supported"
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#endif
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/* Assembly macros */
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#define JE_SDT_S(x) #x
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#define JE_SDT_ASM_1(x) JE_SDT_S(x) "\n"
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#define JE_SDT_ASM_2(x, y) \
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JE_SDT_S(x) "," JE_SDT_S(y) "\n"
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#define JE_SDT_ASM_3(x, y, z) \
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JE_SDT_S(x) "," JE_SDT_S(y) "," JE_SDT_S(z) "\n"
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#define JE_SDT_ASM_3(x, y, z) \
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JE_SDT_S(x) "," JE_SDT_S(y) "," JE_SDT_S(z) "\n"
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#define JE_SDT_ASM_4(x, y, z, p) \
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JE_SDT_S(x) "," JE_SDT_S(y) "," JE_SDT_S(z) "," JE_SDT_S(p) "\n"
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#define JE_SDT_ASM_5(x, y, z, p, q) \
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JE_SDT_S(x) "," JE_SDT_S(y) "," JE_SDT_S(z) "," JE_SDT_S(p) "," \
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JE_SDT_S(q) "\n"
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/* Arg size */
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#ifdef __LP64__
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#define JE_SDT_ASM_ADDR .8byte
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#else
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#define JE_SDT_ASM_ADDR .4byte
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#endif
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#define JE_SDT_NOTE_NAME "stapsdt"
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#define JE_SDT_NOTE_TYPE 3
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#define JE_SDT_SEMAPHORE_NONE(provider, name) \
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JE_SDT_ASM_1(JE_SDT_ASM_ADDR 0) /* No Semaphore support */
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#define JE_SDT_SEMAPHORE_OPERAND(provider, name) \
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[__sdt_semaphore] "ip" (0) /* No Semaphore */
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#define JE_SDT_ASM_STRING(x) JE_SDT_ASM_1(.asciz JE_SDT_S(x))
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#define JE_SDT_NOTE(provider, name, arg_template) \
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JE_SDT_ASM_1(990: JE_SDT_NOP) \
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JE_SDT_ASM_3( .pushsection .note.stapsdt,"?","note") \
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JE_SDT_ASM_1( .balign 4) \
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JE_SDT_ASM_3( .4byte 992f-991f, 994f-993f, JE_SDT_NOTE_TYPE) \
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JE_SDT_ASM_1(991: .asciz JE_SDT_NOTE_NAME) \
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JE_SDT_ASM_1(992: .balign 4) \
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JE_SDT_ASM_1(993: JE_SDT_ASM_ADDR 990b) \
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JE_SDT_ASM_1( JE_SDT_ASM_ADDR _.stapsdt.base) \
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JE_SDT_SEMAPHORE_NONE(provider, name) \
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JE_SDT_ASM_STRING(provider) \
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JE_SDT_ASM_STRING(name) \
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JE_SDT_ASM_STRING(arg_template) \
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JE_SDT_ASM_1(994: .balign 4) \
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JE_SDT_ASM_1( .popsection)
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#define JE_SDT_BASE \
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JE_SDT_ASM_1( .ifndef _.stapsdt.base) \
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JE_SDT_ASM_5( .pushsection .stapsdt.base, "aG", "progbits", \
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.stapsdt.base,comdat) \
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JE_SDT_ASM_1( .weak _.stapsdt.base) \
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JE_SDT_ASM_1( .hidden _.stapsdt.base) \
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JE_SDT_ASM_1( _.stapsdt.base: .space 1) \
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JE_SDT_ASM_2( .size _.stapsdt.base, 1) \
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JE_SDT_ASM_1( .popsection) \
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JE_SDT_ASM_1( .endif)
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/*
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* Default constraint for probes arguments.
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* See https://gcc.gnu.org/onlinedocs/gcc/Constraints.html
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*/
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#ifndef JE_SDT_ARG_CONSTRAINT
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#define JE_SDT_ARG_CONSTRAINT "nor"
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#endif
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#define JE_SDT_ARGARRAY(x) ((__builtin_classify_type(x) == 14) || \
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(__builtin_classify_type(x) == 5))
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#define JE_SDT_ARGSIZE(x) (JE_SDT_ARGARRAY(x) ? sizeof(void*) : sizeof(x))
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/*
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* Format of each probe argument as operand. Size tagged with JE_SDT_Sn,
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* with "n" constraint. Value is tagged with JE_SDT_An with configured
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* constraint.
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*/
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#define JE_SDT_ARG(n, x) \
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[JE_SDT_S##n] "n" ((size_t)JE_SDT_ARGSIZE(x)), \
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[JE_SDT_A##n] JE_SDT_ARG_CONSTRAINT(x)
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/* Templates to append arguments as operands. */
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#define JE_SDT_OPERANDS_0() [__sdt_dummy] "g" (0)
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#define JE_SDT_OPERANDS_1(_1) JE_SDT_ARG(1, _1)
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#define JE_SDT_OPERANDS_2(_1, _2) JE_SDT_OPERANDS_1(_1), JE_SDT_ARG(2, _2)
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#define JE_SDT_OPERANDS_3(_1, _2, _3) JE_SDT_OPERANDS_2(_1, _2), JE_SDT_ARG(3, _3)
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#define JE_SDT_OPERANDS_4(_1, _2, _3, _4) \
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JE_SDT_OPERANDS_3(_1, _2, _3), JE_SDT_ARG(4, _4)
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#define JE_SDT_OPERANDS_5(_1, _2, _3, _4, _5) \
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JE_SDT_OPERANDS_4(_1, _2, _3, _4), JE_SDT_ARG(5, _5)
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#define JE_SDT_OPERANDS_6(_1, _2, _3, _4, _5, _6) \
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JE_SDT_OPERANDS_5(_1, _2, _3, _4, _5), JE_SDT_ARG(6, _6)
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#define JE_SDT_OPERANDS_7(_1, _2, _3, _4, _5, _6, _7) \
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JE_SDT_OPERANDS_6(_1, _2, _3, _4, _5, _6), JE_SDT_ARG(7, _7)
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/* Templates to reference the arguments from operands. */
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#define JE_SDT_ARGFMT(num) %n[JE_SDT_S##num]@%[JE_SDT_A##num]
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#define JE_SDT_ARG_TEMPLATE_0 /* No args */
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#define JE_SDT_ARG_TEMPLATE_1 JE_SDT_ARGFMT(1)
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#define JE_SDT_ARG_TEMPLATE_2 JE_SDT_ARG_TEMPLATE_1 JE_SDT_ARGFMT(2)
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#define JE_SDT_ARG_TEMPLATE_3 JE_SDT_ARG_TEMPLATE_2 JE_SDT_ARGFMT(3)
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#define JE_SDT_ARG_TEMPLATE_4 JE_SDT_ARG_TEMPLATE_3 JE_SDT_ARGFMT(4)
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#define JE_SDT_ARG_TEMPLATE_5 JE_SDT_ARG_TEMPLATE_4 JE_SDT_ARGFMT(5)
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#define JE_SDT_ARG_TEMPLATE_6 JE_SDT_ARG_TEMPLATE_5 JE_SDT_ARGFMT(6)
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#define JE_SDT_ARG_TEMPLATE_7 JE_SDT_ARG_TEMPLATE_6 JE_SDT_ARGFMT(7)
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#define JE_SDT_PROBE( \
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provider, name, n, arglist) \
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do { \
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__asm__ __volatile__( \
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JE_SDT_NOTE(provider, name, \
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JE_SDT_ARG_TEMPLATE_##n) \
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:: JE_SDT_SEMAPHORE_OPERAND(provider, name), \
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JE_SDT_OPERANDS_##n arglist); \
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__asm__ __volatile__(JE_SDT_BASE); \
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} while (0)
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#define JE_USDT(name, N, ...) \
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JE_SDT_PROBE(jemalloc, name, N, (__VA_ARGS__))
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#endif /* JEMALLOC_INTERNAL_JEMALLOC_PROBE_CUSTOM_H */
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/* clang-format on */
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11
include/jemalloc/internal/jemalloc_probe_stap.h
Normal file
11
include/jemalloc/internal/jemalloc_probe_stap.h
Normal file
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@ -0,0 +1,11 @@
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#ifndef JEMALLOC_INTERNAL_JEMALLOC_PROBE_STAP_H
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#define JEMALLOC_INTERNAL_JEMALLOC_PROBE_STAP_H
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#include <sys/sdt.h>
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#define JE_USDT(name, N, ...) JE_USDT_PROBE_N(name, N, ##__VA_ARGS__)
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#define JE_USDT_PROBE_N(name, N, ...) \
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STAP_PROBE##N(jemalloc, name, ##__VA_ARGS__)
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#endif /* JEMALLOC_INTERNAL_JEMALLOC_PROBE_STAP_H */
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