调试chromium设置 How to enable logging

 

 源码里面的开关

// Sets the minimum log level. Valid values are from 0 to 3:
// INFO = 0, WARNING = 1, LOG_ERROR = 2, LOG_FATAL = 3.
const char kLoggingLevel[]                  = "log-level";

 可以设置loglevel针对模块，c文件，头文件，规则如下，具体参考：​​base/logging.h​​

// The verbose logging can also be turned on module-by-module.  For instance,
//    --vmodule=profile=2,icon_loader=1,browser_*=3,*/chromeos/*=4 --v=0
// will cause:
//   a. VLOG(2) and lower messages to be printed from profile.{h,cc}
//   b. VLOG(1) and lower messages to be printed from icon_loader.{h,cc}
//   c. VLOG(3) and lower messages to be printed from files prefixed with
//      "browser"
//   d. VLOG(4) and lower messages to be printed from files under a
//     "chromeos" directory.
//   e. VLOG(0) and lower messages to be printed from elsewhere
//
// The wildcarding functionality shown by (c) supports both '*' (match
// 0 or more characters) and '?' (match any single character)
// wildcards.  Any pattern containing a forward or backward slash will
// be tested against the whole pathname and not just the module.
// E.g., "*/foo/bar/*=2" would change the logging level for all code
// in source files under a "foo/bar" directory.
//
// Note that for a Chromium binary built in release mode (is_debug = false) you
// must pass "--enable-logging=stderr" in order to see the output of VLOG
// statements.

比如：设置trace跟踪，也可以用chrome://tracing

 out\Default\chrome1.exe  --enable-skia-benchmarking  --enable-gpu-benchmarking --no-sandbox    --process-per-site  --remote-debugging-port=9222  --enable-logging    --v=2  --trace-startup=cc  --trace-startup-file=d:\\chrometrace.log