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openresty/patches/nginx-1.2.6-dtrace.patch

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diff --git a/README b/README
index 2f68e14..4f2c4a7 100644
--- a/README
+++ b/README
@@ -1,3 +1,40 @@
+This is an Nginx fork that adds dtrace USDT probes.
-Documentation is available at http://nginx.org
+This is still under development and not usable yet.
+
+Installation:
+
+ ./configure --with-dtrace-probes \
+ --with-dtrace=/usr/sbin/dtrace \
+ ...
+ make
+ make install
+
+Usage on Linux (with systemtap):
+
+ # make the stap-nginx script visiable in your PATH
+ export PATH=/usr/local/nginx/sbin:$PATH
+
+ # list all the static probes available in your nginx
+ stap-nginx -L 'process("nginx").mark("*")'
+
+ # run the test.stp file
+ stap-nginx test.stp
+
+Sample test.stp file:
+
+ probe begin
+ {
+ print("Tracing. Hit CTRL-C to stop.\n")
+ }
+
+ probe process("nginx").mark("http-subrequest-start")
+ {
+ printf("uri: %s?%s\n", ngx_http_req_uri($arg1),
+ ngx_http_req_args($arg1))
+ }
+
+For now, only tested on Solaris 11 Express and Fedora Linux 17.
+
+The original Nginx documentation is available at http://nginx.org
diff --git a/auto/install b/auto/install
index 254f9bc..0252fef 100644
--- a/auto/install
+++ b/auto/install
@@ -16,6 +16,20 @@ END
fi
+case ".$NGX_STAP_NGX_PATH" in
+ ./*)
+ ;;
+
+ .)
+ NGX_STAP_NGX_PATH=$NGX_PREFIX/sbin/stap-nginx
+ ;;
+
+ *)
+ NGX_STAP_NGX_PATH=$NGX_PREFIX/$NGX_STAP_NGX_PATH
+ ;;
+esac
+
+
case ".$NGX_SBIN_PATH" in
./*)
;;
@@ -53,6 +67,16 @@ case ".$NGX_PID_PATH" in
esac
+case ".$NGX_TAPSET_PREFIX" in
+ ./* | .)
+ ;;
+
+ *)
+ NGX_TAPSET_PREFIX=$NGX_PREFIX/$NGX_TAPSET_PREFIX
+ ;;
+esac
+
+
case ".$NGX_ERROR_LOG_PATH" in
./* | .)
;;
@@ -151,6 +175,36 @@ install: $NGX_OBJS${ngx_dirsep}nginx${ngx_binext} \
|| cp -R $NGX_HTML '\$(DESTDIR)$NGX_PREFIX'
END
+if [ $NGX_DTRACE = YES -a $DTRACE_FROM_SYSTEMTAP = YES ]; then
+
+ ngx_tapset_srcs="$NGX_TAPSET_SRCS"
+
+ cat << END >> $NGX_MAKEFILE
+ test -d '\$(DESTDIR)$NGX_TAPSET_PREFIX' || \
+ mkdir -p '\$(DESTDIR)$NGX_TAPSET_PREFIX'
+END
+
+ for ngx_tapset_src in $ngx_tapset_srcs
+ do
+ ngx_tapset_file=`basename $ngx_tapset_src`
+
+ cat << END >> $NGX_MAKEFILE
+
+ sed -e "s|NGX_SBIN_PATH|$NGX_SBIN_PATH|g" $ngx_long_cont \
+ $ngx_tapset_src > '\$(DESTDIR)$NGX_TAPSET_PREFIX/$ngx_tapset_file'
+END
+
+ done
+
+ cat << END >> $NGX_MAKEFILE
+
+ test -d '\$(DESTDIR)`dirname "$NGX_STAP_NGX_PATH"`' || \
+ mkdir -p '\$(DESTDIR)`dirname "$NGX_STAP_NGX_PATH"`'
+ cp $NGX_OBJS/stap-nginx '\$(DESTDIR)$NGX_STAP_NGX_PATH'
+ chmod 0755 '\$(DESTDIR)$NGX_STAP_NGX_PATH'
+END
+
+fi
if test -n "$NGX_ERROR_LOG_PATH"; then
cat << END >> $NGX_MAKEFILE
@@ -162,6 +216,18 @@ END
fi
+if [ $NGX_DTRACE = YES ]; then
+ cat << END >> $NGX_MAKEFILE
+
+$NGX_OBJS${ngx_dirsep}stap-nginx: src/dtrace/stap-nginx
+ sed -e "s|NGX_TAPSET_PREFIX|$NGX_TAPSET_PREFIX|g" $ngx_long_cont \
+ -e "s|NGX_SBIN_DIR|`dirname $NGX_SBIN_PATH`|g" $ngx_long_cont \
+ -e "s|NGX_SBIN_PATH|$NGX_SBIN_PATH|g" $ngx_long_cont \
+ src/dtrace/stap-nginx > $NGX_OBJS${ngx_dirsep}stap-nginx
+END
+fi
+
+
# create Makefile
cat << END >> Makefile
diff --git a/auto/make b/auto/make
index 05b7454..aa813b1 100644
--- a/auto/make
+++ b/auto/make
@@ -26,6 +26,9 @@ LINK = $LINK
END
+if [ $NGX_DTRACE = YES ]; then
+ echo DTRACE = $DTRACE >> $NGX_MAKEFILE
+fi
if test -n "$NGX_PERL_CFLAGS"; then
echo NGX_PERL_CFLAGS = $NGX_PERL_CFLAGS >> $NGX_MAKEFILE
@@ -177,6 +180,44 @@ ngx_objs=`echo $ngx_all_objs $ngx_modules_obj \
| sed -e "s/ *\([^ ][^ ]*\)/$ngx_long_regex_cont\1/g" \
-e "s/\//$ngx_regex_dirsep/g"`
+if [ $NGX_DTRACE = YES ]; then
+
+ ngx_dtrace_obj=$NGX_OBJS${ngx_dirsep}ngx_dtrace_provider.$ngx_objext
+
+ ngx_dtrace_h=$NGX_OBJS${ngx_dirsep}ngx_dtrace_provider.h
+
+ ngx_dtrace_d=$NGX_OBJS${ngx_dirsep}dtrace_providers.d
+
+ ngx_dtrace_providers=`echo $NGX_DTRACE_PROVIDERS \
+ | sed -e "s/ *\([^ ][^ ]*\)/$ngx_long_regex_cont\1/g" \
+ -e "s/\//$ngx_regex_dirsep/g"`
+
+ cat << END >> $NGX_MAKEFILE
+
+all: $NGX_OBJS${ngx_dirsep}nginx${ngx_binext}
+
+$ngx_dtrace_d: $ngx_dtrace_providers
+ cat $ngx_dtrace_providers > $ngx_dtrace_d
+
+$ngx_dtrace_h: $ngx_dtrace_d
+ \$(DTRACE) -xnolibs -h -o $ngx_dtrace_h -s $ngx_dtrace_d
+END
+
+ if [ $DTRACE_PROBE_OBJ = YES ]; then
+ cat << END >> $NGX_MAKEFILE
+$ngx_dtrace_obj: $ngx_dtrace_d $ngx_deps$ngx_spacer
+ \$(DTRACE) -xnolibs -G -o $ngx_dtrace_obj -s $ngx_dtrace_d $ngx_objs
+END
+
+ ngx_deps="$ngx_deps$ngx_long_cont$ngx_dtrace_obj"
+ ngx_objs="$ngx_objs$ngx_long_cont$ngx_dtrace_obj"
+
+ if [ "$DTRACE_FROM_SYSTEMTAP" = YES ]; then
+ ngx_deps="$ngx_deps$ngx_long_cont$NGX_OBJS${ngx_dirsep}stap-nginx"
+ fi
+ fi
+fi
+
if test -n "$NGX_LD_OPT$CORE_LIBS"; then
ngx_libs=`echo $NGX_LD_OPT $CORE_LIBS \
| sed -e "s/\//$ngx_regex_dirsep/g" -e "s/^/$ngx_long_regex_cont/"`
diff --git a/auto/options b/auto/options
index 6c3a4db..8d18c01 100644
--- a/auto/options
+++ b/auto/options
@@ -12,6 +12,8 @@ NGX_CONF_PATH=
NGX_ERROR_LOG_PATH=
NGX_PID_PATH=
NGX_LOCK_PATH=
+NGX_TAPSET_PREFIX=
+NGX_STAP_NGX_PATH=
NGX_USER=
NGX_GROUP=
@@ -20,6 +22,12 @@ CPP=
NGX_OBJS=objs
NGX_DEBUG=NO
+NGX_DTRACE=NO
+DTRACE=dtrace
+
+DTRACE_PROBE_OBJ=YES
+DTRACE_FROM_SYSTEMTAP=NO
+
NGX_CC_OPT=
NGX_LD_OPT=
CPU=NO
@@ -170,6 +178,8 @@ do
--error-log-path=*) NGX_ERROR_LOG_PATH="$value";;
--pid-path=*) NGX_PID_PATH="$value" ;;
--lock-path=*) NGX_LOCK_PATH="$value" ;;
+ --tapset-prefix=*) NGX_TAPSET_PREFIX="$value" ;;
+ --stap-nginx-path=*) NGX_STAP_NGX_PATH="$value" ;;
--user=*) NGX_USER="$value" ;;
--group=*) NGX_GROUP="$value" ;;
@@ -275,7 +285,8 @@ use the \"--without-http_limit_conn_module\" option instead"
--with-ld-opt=*) NGX_LD_OPT="$value" ;;
--with-cpu-opt=*) CPU="$value" ;;
--with-debug) NGX_DEBUG=YES ;;
-
+ --with-dtrace=*) DTRACE="$value" ;;
+ --with-dtrace-probes) NGX_DTRACE=YES ;;
--without-pcre) USE_PCRE=DISABLED ;;
--with-pcre) USE_PCRE=YES ;;
--with-pcre=*) PCRE="$value" ;;
@@ -329,6 +340,8 @@ cat << END
--error-log-path=PATH set error log pathname
--pid-path=PATH set nginx.pid pathname
--lock-path=PATH set nginx.lock pathname
+ --tapset-prefix=PATH set systemtap tapset directory prefix
+ --stap-nginx-path=PATH set stap-nginx pathname
--user=USER set non-privileged user for
worker processes
@@ -455,6 +468,8 @@ cat << END
--with-openssl-opt=OPTIONS set additional build options for OpenSSL
--with-debug enable debug logging
+ --with-dtrace-probes enable dtrace USDT probes
+ --with-dtrace=PATH set dtrace utility pathname
END
@@ -484,6 +499,7 @@ NGX_CONF_PATH=${NGX_CONF_PATH:-conf/nginx.conf}
NGX_CONF_PREFIX=`dirname $NGX_CONF_PATH`
NGX_PID_PATH=${NGX_PID_PATH:-logs/nginx.pid}
NGX_LOCK_PATH=${NGX_LOCK_PATH:-logs/nginx.lock}
+NGX_TAPSET_PREFIX=${NGX_TAPSET_PREFIX:-tapset}
if [ ".$NGX_ERROR_LOG_PATH" = ".stderr" ]; then
NGX_ERROR_LOG_PATH=
diff --git a/auto/os/darwin b/auto/os/darwin
index 590e036..af33cf3 100644
--- a/auto/os/darwin
+++ b/auto/os/darwin
@@ -114,3 +114,6 @@ ngx_feature_libs=
ngx_feature_test="int32_t lock, n;
n = OSAtomicCompareAndSwap32Barrier(0, 1, lock)"
. auto/feature
+
+DTRACE_PROBE_OBJ=NO
+
diff --git a/auto/os/freebsd b/auto/os/freebsd
index 6aa823f..ee15166 100644
--- a/auto/os/freebsd
+++ b/auto/os/freebsd
@@ -142,3 +142,8 @@ if [ $version -ge 701000 ]; then
echo " + cpuset_setaffinity() found"
have=NGX_HAVE_CPUSET_SETAFFINITY . auto/have
fi
+
+if [ $NGX_DTRACE = YES ]; then
+ NGX_LD_OPT="$NGX_LD_OPT -lelf"
+fi
+
diff --git a/auto/os/linux b/auto/os/linux
index c506d3d..cbbfbf1 100644
--- a/auto/os/linux
+++ b/auto/os/linux
@@ -151,3 +151,5 @@ ngx_include="sys/vfs.h"; . auto/include
CC_AUX_FLAGS="$cc_aux_flags -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64"
+
+DTRACE_FROM_SYSTEMTAP=YES
diff --git a/auto/sources b/auto/sources
index 522d722..5e48797 100644
--- a/auto/sources
+++ b/auto/sources
@@ -36,7 +36,13 @@ CORE_DEPS="src/core/nginx.h \
src/core/ngx_conf_file.h \
src/core/ngx_resolver.h \
src/core/ngx_open_file_cache.h \
- src/core/ngx_crypt.h"
+ src/core/ngx_crypt.h \
+ src/core/ngx_core_probe.h"
+
+
+if [ $NGX_DTRACE = YES ]; then
+ CORE_DEPS="$CORE_DEPS objs/ngx_dtrace_provider.h"
+fi
CORE_SRCS="src/core/nginx.c \
@@ -82,14 +88,15 @@ OPENSSL_SRCS=src/event/ngx_event_openssl.c
EVENT_MODULES="ngx_events_module ngx_event_core_module"
-EVENT_INCS="src/event src/event/modules"
+EVENT_INCS="src/event src/event/modules src/http src/http/modules"
EVENT_DEPS="src/event/ngx_event.h \
src/event/ngx_event_timer.h \
src/event/ngx_event_posted.h \
src/event/ngx_event_busy_lock.h \
src/event/ngx_event_connect.h \
- src/event/ngx_event_pipe.h"
+ src/event/ngx_event_pipe.h \
+ src/event/ngx_event_probe.h"
EVENT_SRCS="src/event/ngx_event.c \
src/event/ngx_event_timer.c \
@@ -291,7 +298,8 @@ HTTP_DEPS="src/http/ngx_http.h \
src/http/ngx_http_script.h \
src/http/ngx_http_upstream.h \
src/http/ngx_http_upstream_round_robin.h \
- src/http/ngx_http_busy_lock.h"
+ src/http/ngx_http_busy_lock.h \
+ src/http/ngx_http_probe.h"
HTTP_SRCS="src/http/ngx_http.c \
src/http/ngx_http_core_module.c \
@@ -529,3 +537,8 @@ NGX_GOOGLE_PERFTOOLS_MODULE=ngx_google_perftools_module
NGX_GOOGLE_PERFTOOLS_SRCS=src/misc/ngx_google_perftools_module.c
NGX_CPP_TEST_SRCS=src/misc/ngx_cpp_test_module.cpp
+
+NGX_DTRACE_PROVIDERS=src/dtrace/nginx_provider.d
+
+NGX_TAPSET_SRCS=src/dtrace/nginx.stp
+
diff --git a/auto/summary b/auto/summary
index dcebec9..3cb269e 100644
--- a/auto/summary
+++ b/auto/summary
@@ -92,6 +92,19 @@ else
echo " nginx logs errors to stderr"
fi
+if [ $NGX_DTRACE = YES ]; then
+ cat << END
+ nginx dtrace static probes enabled
+END
+
+ if [ $DTRACE_FROM_SYSTEMTAP = YES ]; then
+ cat << END
+ nginx systemtap tapset prefix: "$NGX_TAPSET_PREFIX"
+ nginx systemtap wrapper script: "$NGX_STAP_NGX_PATH"
+END
+ fi
+fi
+
cat << END
nginx http access log file: "$NGX_HTTP_LOG_PATH"
nginx http client request body temporary files: "$NGX_HTTP_CLIENT_TEMP_PATH"
diff --git a/configure b/configure
index d7d8189..05fab87 100755
--- a/configure
+++ b/configure
@@ -23,6 +23,9 @@ if [ $NGX_DEBUG = YES ]; then
have=NGX_DEBUG . auto/have
fi
+if [ $NGX_DTRACE = YES ]; then
+ have=NGX_DTRACE . auto/have
+fi
if test -z "$NGX_PLATFORM"; then
echo "checking for OS"
diff --git a/src/core/ngx_core_probe.h b/src/core/ngx_core_probe.h
new file mode 100644
index 0000000..91bf91e
--- /dev/null
+++ b/src/core/ngx_core_probe.h
@@ -0,0 +1,25 @@
+#ifndef _NGX_CORE_PROBE_H_INCLUDED_
+#define _NGX_CORE_PROBE_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+
+
+#if (NGX_DTRACE)
+
+#include <ngx_http.h>
+#include <ngx_dtrace_provider.h>
+
+#define ngx_core_probe_create_pool_done(pool, size) \
+ NGINX_CREATE_POOL_DONE(pool, size)
+
+#else /* !(NGX_DTRACE) */
+
+#define ngx_core_probe_create_pool_done(pool, size)
+
+#endif
+
+
+#endif /* _NGX_CORE_PROBE_H_INCLUDED_ */
diff --git a/src/core/ngx_palloc.c b/src/core/ngx_palloc.c
index efbc244..8d81aab 100644
--- a/src/core/ngx_palloc.c
+++ b/src/core/ngx_palloc.c
@@ -7,6 +7,7 @@
#include <ngx_config.h>
#include <ngx_core.h>
+#include <ngx_core_probe.h>
static void *ngx_palloc_block(ngx_pool_t *pool, size_t size);
@@ -37,6 +38,8 @@ ngx_create_pool(size_t size, ngx_log_t *log)
p->cleanup = NULL;
p->log = log;
+ ngx_core_probe_create_pool_done(p, size);
+
return p;
}
diff --git a/src/dtrace/nginx.stp b/src/dtrace/nginx.stp
new file mode 100644
index 0000000..5bae185
--- /dev/null
+++ b/src/dtrace/nginx.stp
@@ -0,0 +1,269 @@
+/* tapset for nginx */
+
+
+function ngx_indent(n, delta)
+{
+ s = ""
+ for (i = 0; i < n; i++) {
+ s .= delta
+ }
+
+ return s
+}
+
+
+function ngx_http_subreq_depth(r)
+{
+ depth = 0
+
+ for (pr = @cast(r, "ngx_http_request_t", "NGX_SBIN_PATH")->parent;
+ pr != 0;
+ pr = @cast(pr, "ngx_http_request_t", "NGX_SBIN_PATH")->parent)
+ {
+ depth++
+ }
+
+ return depth
+}
+
+
+function ngx_http_req_parent(r)
+{
+ return @cast(r, "ngx_http_request_s", "NGX_SBIN_PATH")->parent
+}
+
+
+/* retrieve the request uri string from the ngx_http_request_t pointer */
+function ngx_http_req_uri(r)
+{
+ len = @cast(r, "ngx_http_request_s", "NGX_SBIN_PATH")->uri->len
+
+ if (len == 0) {
+ return ""
+ }
+
+ return user_string_n(@cast(r, "ngx_http_request_s", "NGX_SBIN_PATH")->uri->data, len)
+}
+
+
+/* retrieve the request query string from the ngx_http_request_t pointer */
+function ngx_http_req_args(r)
+{
+ len = @cast(r, "ngx_http_request_s", "NGX_SBIN_PATH")->args->len
+
+ if (len == 0) {
+ return ""
+ }
+
+ return user_string_n(@cast(r, "ngx_http_request_s", "NGX_SBIN_PATH")->args->data, len)
+}
+
+
+/* retrieve the first command name (or directive name) from
+ * the ngx_module_t pointer */
+function ngx_http_module_cmd(m)
+{
+ cmds = @cast(m, "ngx_module_t", "NGX_SBIN_PATH")->commands
+ if (cmds == 0) {
+ return ""
+ }
+
+ len = @cast(cmds, "ngx_command_t", "NGX_SBIN_PATH")->name->len
+
+ if (len == 0) {
+ return ""
+ }
+
+ return user_string_n(@cast(cmds, "ngx_command_t", "NGX_SBIN_PATH")->name->data, len)
+}
+
+
+function ngx_chain_buf(cl)
+{
+ return @cast(cl, "ngx_chain_t", "NGX_SBIN_PATH")->buf
+}
+
+
+function ngx_chain_next(cl)
+{
+ return @cast(cl, "ngx_chain_t", "NGX_SBIN_PATH")->next
+}
+
+
+function ngx_buf_in_memory(b)
+{
+ return @cast(b, "ngx_buf_t", "NGX_SBIN_PATH")->temporary
+ || @cast(b, "ngx_buf_t", "NGX_SBIN_PATH")->memory
+ || @cast(b, "ngx_buf_t", "NGX_SBIN_PATH")->mmap
+}
+
+
+function ngx_buf_pos(b)
+{
+ return @cast(b, "ngx_buf_t", "NGX_SBIN_PATH")->pos
+}
+
+
+function ngx_buf_file_pos(b)
+{
+ return @cast(b, "ngx_buf_t", "NGX_SBIN_PATH")->file_pos
+}
+
+
+function ngx_buf_last(b)
+{
+ return @cast(b, "ngx_buf_t", "NGX_SBIN_PATH")->last
+}
+
+
+function ngx_buf_file_last(b)
+{
+ return @cast(b, "ngx_buf_t", "NGX_SBIN_PATH")->file_last
+}
+
+
+function ngx_buf_end(b)
+{
+ return @cast(b, "ngx_buf_t", "NGX_SBIN_PATH")->end
+}
+
+
+function ngx_buf_last_buf(b)
+{
+ return @cast(b, "ngx_buf_t", "/home/agentzh/git/lua-nginx-module/work/nginx/sbin/nginx")->last_buf
+}
+
+
+function ngx_buf_sync(b)
+{
+ return @cast(b, "ngx_buf_t", "/home/agentzh/git/lua-nginx-module/work/nginx/sbin/nginx")->sync
+}
+
+
+function ngx_buf_flush(b)
+{
+ return @cast(b, "ngx_buf_t", "/home/agentzh/git/lua-nginx-module/work/nginx/sbin/nginx")->flush
+}
+
+
+function ngx_buf_size(b)
+{
+ if (ngx_buf_in_memory(b)) {
+ return ngx_buf_last(b) - ngx_buf_pos(b)
+ }
+
+ return ngx_buf_file_last(b) - ngx_buf_file_pos(b)
+}
+
+
+function ngx_buf_data(b)
+{
+ return user_string_n(ngx_buf_pos(b), ngx_buf_last(b) - ngx_buf_pos(b))
+}
+
+
+function ngx_chain_writer_ctx_out(ctx)
+{
+ return @cast(c, "ngx_chain_writer_ctx_t", "NGX_SBIN_PATH")->out
+}
+
+
+function ngx_chain_dump:string (input)
+{
+ if (input == 0) {
+ return "NULL"
+ }
+
+ out = ""
+ cl = input
+ while (cl) {
+ buf = ngx_chain_buf(cl)
+
+ if (ngx_buf_in_memory(buf)) {
+ out .= sprintf("[%s]", text_str(ngx_buf_data(buf)))
+
+ } else {
+ out .= "\"\""
+ }
+
+ if (ngx_buf_last_buf(buf)) {
+ out .= "<eof>"
+ }
+
+ if (ngx_buf_sync(buf)) {
+ out .= "<sync>"
+ }
+
+ if (ngx_buf_flush(buf)) {
+ out .= "<flush>"
+ }
+
+ cl = ngx_chain_next(cl)
+ if (cl) {
+ out .= sprintf(" ")
+ }
+ }
+ return out
+}
+
+
+function ngx_pool_cleanup_file_name(c)
+{
+ return user_string(@cast(c, "ngx_pool_cleanup_file_t", "NGX_SBIN_PATH")->name)
+}
+
+
+function ngx_http_req_content_length(r)
+{
+ return @cast(r, "ngx_http_request_t", "NGX_SBIN_PATH")->headers_in->content_length_n
+}
+
+
+function ngx_http_req_body_temp_file_name(r)
+{
+ rb = @cast(r, "ngx_http_request_t", "NGX_SBIN_PATH")->request_body
+ if (!rb) {
+ return ""
+ }
+
+ tf = @cast(rb, "ngx_http_request_body_t", "NGX_SBIN_PATH")->temp_file
+ if (!tf) {
+ return ""
+ }
+
+ len = @cast(tf, "ngx_temp_file_t", "NGX_SBIN_PATH")->file->name->len
+
+ return user_string_n(@cast(tf, "ngx_temp_file_t", "NGX_SBIN_PATH")->file->name->data, len)
+}
+
+
+function ngx_table_elt_key(e)
+{
+ len = @cast(e, "ngx_table_elt_t", "NGX_SBIN_PATH")->key->len
+
+ return user_string_n(@cast(e, "ngx_table_elt_t", "NGX_SBIN_PATH")->key->data, len)
+}
+
+
+function ngx_table_elt_value(e)
+{
+ len = @cast(e, "ngx_table_elt_t", "NGX_SBIN_PATH")->value->len
+
+ return user_string_n(@cast(e, "ngx_table_elt_t", "NGX_SBIN_PATH")->value->data, len)
+}
+
+
+function ngx_iovec_dump:string (iov, iovcnt) {
+ out = ""
+ for (i = 0; i < iovcnt; i++) {
+ out .= sprintf("\"%s\"(%p)", text_str(user_string_n(
+ @cast(iov, "struct iovec")[i]->iov_base,
+ @cast(iov, "struct iovec")[i]->iov_len)
+ ), @cast(iov, "struct iovec")[i]->iov_base)
+ if (i != iovcnt - 1) {
+ out .= " "
+ }
+ }
+ return out
+}
+
diff --git a/src/dtrace/nginx_provider.d b/src/dtrace/nginx_provider.d
new file mode 100644
index 0000000..147ca12
--- /dev/null
+++ b/src/dtrace/nginx_provider.d
@@ -0,0 +1,41 @@
+typedef struct { int dummy; } ngx_http_request_t;
+typedef struct { int dummy; } ngx_str_t;
+typedef int64_t ngx_int_t;
+typedef uint64_t ngx_uint_t;
+typedef ngx_uint_t ngx_msec_t;
+typedef struct { int dummy; } ngx_module_t;
+typedef struct { int dummy; } ngx_http_module_t;
+typedef struct { int dummy; } ngx_table_elt_t;
+typedef struct { int dummy; } ngx_event_t;
+typedef struct { int dummy; } ngx_pool_t;
+typedef char unsigned u_char;
+
+
+provider nginx {
+ /* probes for subrequests */
+ probe http__subrequest__cycle(ngx_http_request_t *pr, ngx_str_t *uri, ngx_str_t *args);
+ probe http__subrequest__start(ngx_http_request_t *r);
+ probe http__subrequest__finalize_writing(ngx_http_request_t *r);
+ probe http__subrequest__finalize_nonactive(ngx_http_request_t *r);
+ probe http__subrequest__wake__parent(ngx_http_request_t *r);
+ probe http__subrequest__done(ngx_http_request_t *r);
+ probe http__subrequest__post__start(ngx_http_request_t *r, ngx_int_t rc);
+ probe http__subrequest__post__done(ngx_http_request_t *r, ngx_int_t rc);
+ probe http__module__post__config(ngx_module_t *m);
+ probe http__read__body__abort(ngx_http_request_t *r, char *reason);
+ probe http__read__body__done(ngx_http_request_t *r);
+ probe http__read__req__line__done(ngx_http_request_t *r);
+ probe http__read__req__header__done(ngx_http_request_t *r, ngx_table_elt_t *h);
+ probe timer__add(ngx_event_t *ev, ngx_msec_t timer);
+ probe timer__del(ngx_event_t *ev);
+ probe timer__expire(ngx_event_t *ev);
+ probe create__pool__done(ngx_pool_t *pool, size_t size);
+};
+
+
+#pragma D attributes Evolving/Evolving/Common provider nginx provider
+#pragma D attributes Private/Private/Unknown provider nginx module
+#pragma D attributes Private/Private/Unknown provider nginx function
+#pragma D attributes Private/Private/Common provider nginx name
+#pragma D attributes Evolving/Evolving/Common provider nginx args
+
diff --git a/src/dtrace/stap-nginx b/src/dtrace/stap-nginx
new file mode 100755
index 0000000..1bca4cf
--- /dev/null
+++ b/src/dtrace/stap-nginx
@@ -0,0 +1,6 @@
+#!/bin/sh
+
+PATH="NGX_SBIN_DIR:$PATH"
+export PATH
+exec stap -d "NGX_SBIN_PATH" -I "NGX_TAPSET_PREFIX" "$@"
+
diff --git a/src/event/ngx_event_probe.h b/src/event/ngx_event_probe.h
new file mode 100644
index 0000000..5aa0397
--- /dev/null
+++ b/src/event/ngx_event_probe.h
@@ -0,0 +1,33 @@
+#ifndef _NGX_EVENT_PROBE_H_INCLUDED_
+#define _NGX_EVENT_PROBE_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_event.h>
+
+
+#if (NGX_DTRACE)
+
+#include <ngx_http.h>
+#include <ngx_dtrace_provider.h>
+
+#define ngx_event_probe_timer_add(ev, timer) \
+ NGINX_TIMER_ADD(ev, timer)
+
+#define ngx_event_probe_timer_del(ev) \
+ NGINX_TIMER_DEL(ev)
+
+#define ngx_event_probe_timer_expire(ev) \
+ NGINX_TIMER_EXPIRE(ev)
+
+#else /* !(NGX_DTRACE) */
+
+#define ngx_event_probe_timer_add(ev, timer)
+#define ngx_event_probe_timer_del(ev)
+#define ngx_event_probe_timer_expire(ev)
+
+#endif
+
+
+#endif /* _NGX_EVENT_PROBE_H_INCLUDED_ */
diff --git a/src/event/ngx_event_timer.c b/src/event/ngx_event_timer.c
index 177ac1c..531cccc 100644
--- a/src/event/ngx_event_timer.c
+++ b/src/event/ngx_event_timer.c
@@ -144,6 +144,8 @@ ngx_event_expire_timers(void)
}
#endif
+ ngx_event_probe_timer_expire(ev);
+
ev->timedout = 1;
ev->handler(ev);
diff --git a/src/event/ngx_event_timer.h b/src/event/ngx_event_timer.h
index ec9b316..6095d8c 100644
--- a/src/event/ngx_event_timer.h
+++ b/src/event/ngx_event_timer.h
@@ -12,6 +12,7 @@
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_event.h>
+#include <ngx_event_probe.h>
#define NGX_TIMER_INFINITE (ngx_msec_t) -1
@@ -35,6 +36,8 @@ extern ngx_thread_volatile ngx_rbtree_t ngx_event_timer_rbtree;
static ngx_inline void
ngx_event_del_timer(ngx_event_t *ev)
{
+ ngx_event_probe_timer_del(ev);
+
ngx_log_debug2(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"event timer del: %d: %M",
ngx_event_ident(ev->data), ev->timer.key);
@@ -85,6 +88,8 @@ ngx_event_add_timer(ngx_event_t *ev, ngx_msec_t timer)
ev->timer.key = key;
+ ngx_event_probe_timer_add(ev, timer);
+
ngx_log_debug3(NGX_LOG_DEBUG_EVENT, ev->log, 0,
"event timer add: %d: %M:%M",
ngx_event_ident(ev->data), timer, ev->timer.key);
diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index f1f8a48..91bdd64 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -8,6 +8,7 @@
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
+#include <ngx_http_probe.h>
static char *ngx_http_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
@@ -307,6 +308,9 @@ ngx_http_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf)
module = ngx_modules[m]->ctx;
if (module->postconfiguration) {
+
+ ngx_http_probe_module_post_config(ngx_modules[m]);
+
if (module->postconfiguration(cf) != NGX_OK) {
return NGX_CONF_ERROR;
}
diff --git a/src/http/ngx_http_core_module.c b/src/http/ngx_http_core_module.c
index 18402df..1487fef 100644
--- a/src/http/ngx_http_core_module.c
+++ b/src/http/ngx_http_core_module.c
@@ -8,6 +8,7 @@
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
+#include <ngx_http_probe.h>
typedef struct {
@@ -2377,6 +2378,8 @@ ngx_http_subrequest(ngx_http_request_t *r,
r->main->subrequests--;
if (r->main->subrequests == 0) {
+ ngx_http_probe_subrequest_cycle(r, uri, args);
+
ngx_log_error(NGX_LOG_ERR, r->connection->log, 0,
"subrequests cycle while processing \"%V\"", uri);
r->main->subrequests = 1;
@@ -2491,6 +2494,8 @@ ngx_http_subrequest(ngx_http_request_t *r,
*psr = sr;
+ ngx_http_probe_subrequest_start(sr);
+
return ngx_http_post_request(sr, NULL);
}
diff --git a/src/http/ngx_http_probe.h b/src/http/ngx_http_probe.h
new file mode 100644
index 0000000..d7d2d45
--- /dev/null
+++ b/src/http/ngx_http_probe.h
@@ -0,0 +1,75 @@
+#ifndef _NGX_HTTP_PROBE_H_INCLUDED_
+#define _NGX_HTTP_PROBE_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+#include <ngx_http.h>
+
+
+#if (NGX_DTRACE)
+
+#include <ngx_dtrace_provider.h>
+
+#define ngx_http_probe_subrequest_cycle(pr, uri, args) \
+ NGINX_HTTP_SUBREQUEST_CYCLE(pr, uri, args)
+
+#define ngx_http_probe_subrequest_start(r) \
+ NGINX_HTTP_SUBREQUEST_START(r)
+
+#define ngx_http_probe_subrequest_finalize_writing(r) \
+ NGINX_HTTP_SUBREQUEST_FINALIZE_WRITING(r)
+
+#define ngx_http_probe_subrequest_finalize_nonactive(r) \
+ NGINX_HTTP_SUBREQUEST_FINALIZE_NONACTIVE(r)
+
+#define ngx_http_probe_subrequest_finalize_nonactive(r) \
+ NGINX_HTTP_SUBREQUEST_FINALIZE_NONACTIVE(r)
+
+#define ngx_http_probe_subrequest_wake_parent(r) \
+ NGINX_HTTP_SUBREQUEST_WAKE_PARENT(r)
+
+#define ngx_http_probe_subrequest_done(r) \
+ NGINX_HTTP_SUBREQUEST_DONE(r)
+
+#define ngx_http_probe_subrequest_post_start(r, rc) \
+ NGINX_HTTP_SUBREQUEST_POST_START(r, rc)
+
+#define ngx_http_probe_subrequest_post_done(r, rc) \
+ NGINX_HTTP_SUBREQUEST_POST_DONE(r, rc)
+
+#define ngx_http_probe_module_post_config(m) \
+ NGINX_HTTP_MODULE_POST_CONFIG(m)
+
+#define ngx_http_probe_read_body_abort(r, reason) \
+ NGINX_HTTP_READ_BODY_ABORT(r, reason)
+
+#define ngx_http_probe_read_body_done(r) \
+ NGINX_HTTP_READ_BODY_DONE(r)
+
+#define ngx_http_probe_read_req_line_done(r) \
+ NGINX_HTTP_READ_REQ_LINE_DONE(r)
+
+#define ngx_http_probe_read_req_header_done(r, h) \
+ NGINX_HTTP_READ_REQ_HEADER_DONE(r, h)
+
+#else /* !(NGX_DTRACE) */
+
+#define ngx_http_probe_subrequest_cycle(pr, uri, args)
+#define ngx_http_probe_subrequest_start(r)
+#define ngx_http_probe_subrequest_finalize_writing(r)
+#define ngx_http_probe_subrequest_finalize_nonactive(r)
+#define ngx_http_probe_subrequest_wake_parent(r)
+#define ngx_http_probe_subrequest_done(r)
+#define ngx_http_probe_subrequest_post_start(r, rc)
+#define ngx_http_probe_subrequest_post_done(r, rc)
+#define ngx_http_probe_module_post_config(m)
+#define ngx_http_probe_read_body_abort(r, reason)
+#define ngx_http_probe_read_body_done(r)
+#define ngx_http_probe_read_req_line_done(r)
+#define ngx_http_probe_read_req_header_done(r, h)
+
+#endif /* NGX_DTRACE */
+
+
+#endif /* _NGX_HTTP_PROBE_H_INCLUDED_ */
diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index c44a2cc..fa3bece 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -8,6 +8,7 @@
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
+#include <ngx_http_probe.h>
static void ngx_http_init_request(ngx_event_t *ev);
@@ -865,6 +866,8 @@ ngx_http_process_request_line(ngx_event_t *rev)
}
#endif
+ ngx_http_probe_read_req_line_done(r);
+
ngx_log_debug1(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http request line: \"%V\"", &r->request_line);
@@ -1112,6 +1115,8 @@ ngx_http_process_request_headers(ngx_event_t *rev)
return;
}
+ ngx_http_probe_read_req_header_done(r, h);
+
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, r->connection->log, 0,
"http header: \"%V: %V\"",
&h->key, &h->value);
@@ -1962,7 +1967,11 @@ ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
}
if (r != r->main && r->post_subrequest) {
+ ngx_http_probe_subrequest_post_start(r, rc);
+
rc = r->post_subrequest->handler(r, r->post_subrequest->data, rc);
+
+ ngx_http_probe_subrequest_post_done(r, rc);
}
if (rc == NGX_ERROR
@@ -2012,6 +2021,8 @@ ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
if (r->buffered || r->postponed) {
+ ngx_http_probe_subrequest_finalize_writing(r);
+
if (ngx_http_set_write_handler(r) != NGX_OK) {
ngx_http_terminate_request(r, 0);
}
@@ -2048,10 +2059,14 @@ ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
pr->postponed = pr->postponed->next;
}
+ ngx_http_probe_subrequest_done(r);
+
c->data = pr;
} else {
+ ngx_http_probe_subrequest_finalize_nonactive(r);
+
ngx_log_debug2(NGX_LOG_DEBUG_HTTP, c->log, 0,
"http finalize non-active request: \"%V?%V\"",
&r->uri, &r->args);
@@ -2063,6 +2078,8 @@ ngx_http_finalize_request(ngx_http_request_t *r, ngx_int_t rc)
}
}
+ ngx_http_probe_subrequest_wake_parent(r);
+
if (ngx_http_post_request(pr, NULL) != NGX_OK) {
r->main->count++;
ngx_http_terminate_request(r, 0);
diff --git a/src/http/ngx_http_request_body.c b/src/http/ngx_http_request_body.c
index d0a8ecc..40b2061 100644
--- a/src/http/ngx_http_request_body.c
+++ b/src/http/ngx_http_request_body.c
@@ -8,6 +8,7 @@
#include <ngx_config.h>
#include <ngx_core.h>
#include <ngx_http.h>
+#include <ngx_http_probe.h>
static void ngx_http_read_client_request_body_handler(ngx_http_request_t *r);
@@ -40,11 +41,15 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
r->main->count++;
if (r->request_body || r->discard_body || r->content_length_n == 0) {
+ ngx_http_probe_read_body_abort(r,
+ r->request_body ? "body exists"
+ : "body discarded");
post_handler(r);
return NGX_OK;
}
if (ngx_http_test_expect(r) != NGX_OK) {
+ ngx_http_probe_read_body_abort(r, "test expect failed");
rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
goto done;
}
@@ -58,6 +63,7 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
r->request_body = rb;
if (r->headers_in.content_length_n < 0) {
+ ngx_http_probe_read_body_abort(r, "no content length");
post_handler(r);
return NGX_OK;
}
@@ -68,11 +74,14 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
if (r->request_body_in_file_only) {
if (ngx_http_write_request_body(r, NULL) != NGX_OK) {
+ ngx_http_probe_read_body_abort(r, "create temp file failed");
rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
goto done;
}
}
+ ngx_http_probe_read_body_done(r);
+
post_handler(r);
return NGX_OK;
@@ -130,11 +139,14 @@ ngx_http_read_client_request_body(ngx_http_request_t *r,
if (r->request_body_in_file_only) {
if (ngx_http_write_request_body(r, rb->bufs) != NGX_OK) {
+ ngx_http_probe_read_body_abort(r, "write temp file failed");
rc = NGX_HTTP_INTERNAL_SERVER_ERROR;
goto done;
}
}
+ ngx_http_probe_read_body_done(r);
+
post_handler(r);
return NGX_OK;
@@ -239,6 +251,7 @@ ngx_http_read_client_request_body_handler(ngx_http_request_t *r)
ngx_int_t rc;
if (r->connection->read->timedout) {
+ ngx_http_probe_read_body_abort(r, "timed out");
r->connection->timedout = 1;
ngx_http_finalize_request(r, NGX_HTTP_REQUEST_TIME_OUT);
return;
@@ -273,6 +286,7 @@ ngx_http_do_read_client_request_body(ngx_http_request_t *r)
if (rb->buf->last == rb->buf->end) {
if (ngx_http_write_request_body(r, rb->to_write) != NGX_OK) {
+ ngx_http_probe_read_body_abort(r, "write temp file failed");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
@@ -296,6 +310,9 @@ ngx_http_do_read_client_request_body(ngx_http_request_t *r)
}
if (n == 0) {
+
+ ngx_http_probe_read_body_abort(r, "connection closed");
+
ngx_log_error(NGX_LOG_INFO, c->log, 0,
"client prematurely closed connection");
}
@@ -346,6 +363,7 @@ ngx_http_do_read_client_request_body(ngx_http_request_t *r)
/* save the last part */
if (ngx_http_write_request_body(r, rb->to_write) != NGX_OK) {
+ ngx_http_probe_read_body_abort(r, "write temp file failed");
return NGX_HTTP_INTERNAL_SERVER_ERROR;
}
@@ -375,6 +393,8 @@ ngx_http_do_read_client_request_body(ngx_http_request_t *r)
r->read_event_handler = ngx_http_block_reading;
+ ngx_http_probe_read_body_done(r);
+
rb->post_handler(r);
return NGX_OK;
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