agentzh

==3932== Memcheck, a memory error detector
==3932== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==3932== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==3932== Command: /home/agentzh/git/lua-nginx-module/work/nginx/sbin/nginx -g pid\ /home/agentzh/git/lua-nginx-module/work/nginx/nginx-run.pid;
==3932== 
==3932== Conditional jump or move depends on uninitialised value(s)
==3932==    at 0x104A819F: ???
==3932==    by 0x546BC3F: ???
==3932== 
==3932== Conditional jump or move depends on uninitialised value(s)

agentzh

==5196== Memcheck, a memory error detector
==5196== Copyright (C) 2002-2012, and GNU GPL'd, by Julian Seward et al.
==5196== Using Valgrind-3.8.1 and LibVEX; rerun with -h for copyright info
==5196== Command: /home/agentzh/git/lua-nginx-module/work/nginx/sbin/nginx -g pid\ /home/agentzh/git/lua-nginx-module/work/nginx/nginx-run.pid;
==5196== 
==5196== Conditional jump or move depends on uninitialised value(s)
==5196==    at 0x104CD9BD: ???
==5196==    by 0x565B38F: ???
==5196==    by 0x564E1DF: ???
==5196==    by 0x565AF57: ???

agentzh

diff --git a/src/ngx_http_lua_socket_tcp.c b/src/ngx_http_lua_socket_tcp.c
index 0dcd9e8..0311f8f 100644
--- a/src/ngx_http_lua_socket_tcp.c
+++ b/src/ngx_http_lua_socket_tcp.c
@@ -3967,17 +3967,35 @@ ngx_http_lua_socket_downstream_destroy(lua_State *L)
 static void
 ngx_http_lua_req_socket_cleanup(void *data)
 {
+    ngx_event_t                         *wev, *rev;
+    ngx_connection_t                    *c;

agentzh

diff --git a/src/ngx_http_lua_socket_tcp.c b/src/ngx_http_lua_socket_tcp.c
index 0dcd9e8..c92510b 100644
--- a/src/ngx_http_lua_socket_tcp.c
+++ b/src/ngx_http_lua_socket_tcp.c
@@ -40,7 +40,6 @@ static void ngx_http_lua_socket_send_handler(ngx_http_request_t *r,
 static void ngx_http_lua_socket_connected_handler(ngx_http_request_t *r,
     ngx_http_lua_socket_tcp_upstream_t *u);
 static void ngx_http_lua_socket_tcp_cleanup(void *data);
-static void ngx_http_lua_req_socket_cleanup(void *data);
 static void ngx_http_lua_socket_tcp_finalize(ngx_http_request_t *r,

agentzh

% The ktap Tutorial

Introduction

ktap is a new script-based dynamic tracing tool for linux http://www.ktap.org

ktap is a new script-based dynamic tracing tool for Linux, it uses a scripting language and lets the user trace the Linux kernel dynamically. ktap is designed to give operational insights with interoperability

agentzh

diff --git a/src/lj_state.c b/src/lj_state.c
index c7593f5..8c0ff33 100644
--- a/src/lj_state.c
+++ b/src/lj_state.c
@@ -8,7 +8,7 @@
 
 #define lj_state_c
 #define LUA_CORE
-
+#include <stdio.h>

agentzh

local function factory()
    local f = function ()
        local function func1()
            return error([[blah]])
        end
        local function func2()
            local v = func1()
            return v
        end
        local function func3()

agentzh

        location = /cjson {
            content_by_lua '
                local json = require "cjson.safe"
                ngx.say("cjson.safe: ", json.encode{foo = 123})
            ';
        }

agentzh

$ strace -p 22507 -s 1024
Process 22507 attached
write(4, "2014/03/07 13:52:43 [info] 22507#0: epoll_wait() failed (4: Interrupted system call)\n", 85) = 85
epoll_wait(3, {?} 0xd122b0, 512, -1)    = 1
accept4(6, {sa_family=AF_INET, sin_port=htons(57726), sin_addr=inet_addr("127.0.0.1")}, [16], SOCK_NONBLOCK) = 7
epoll_ctl(3, EPOLL_CTL_ADD, 7, {...})   = 0
epoll_wait(3, {?} 0xd122b0, 512, 60000) = 1
recvfrom(7, "GET /t HTTP/1.1\r\nUser-Agent: curl/7.24.0 (x86_64-redhat-linux-gnu) libcurl/7.24.0 NSS/3.14.3.0 zlib/1.2.5 libidn/1.24 libssh2/1.4.1\r\nHost: localhost:8080\r\nAccept: */*\r\n\r\n", 1024, 0, NULL, NULL) = 170
write(4, "2014/03/07 13:52:45 [notice] 22507#0: *3 [lua] [string \"content_by_lua\"]:2: hi, client: 127.0.0.1, server: localhost, request: \"GET /t HTTP/1.1\", host: \"localhost:8080\"\n", 169) = 169
write(2, "today is Friday, in March (03/07/14)\n", 37) = 37

agentzh

$ ngx-lua-exec-time.sxx -x 14884 
Start tracing process 14884 (/home/agentzh/git/lua-nginx-module/work/nginx/sbin/nginx)...
Hit Ctrl-C to end.
^C
Distribution of Lua code pure execution time (accumulated in each request, in microseconds) for 10000 samples:
(min/avg/max: 4/6/65)
value |-------------------------------------------------- count
    1 |                                                      0
    2 |                                                      0
    4 |@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@  9204