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Diffstat (limited to 'README.dtrace.md')
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1 files changed, 10 insertions, 32 deletions
diff --git a/README.dtrace.md b/README.dtrace.md index bbff233ed9..5bc042f9fc 100644 --- a/README.dtrace.md +++ b/README.dtrace.md @@ -36,44 +36,22 @@ Supported platforms * Linux via SystemTap compatibility. Please see the file `README.systemtap.md` for more details. -Just add the `--enable-dtrace` option to your command when you run the -`configure` script. +Just add the `--with-dynamic-trace=dtrace` option to your command when you +run the `configure` script. If you are using systemtap, the configure option +is `--with-dynamic-trace=systemtap` -Contributions -------------- +Status +------ -Code contributions are welcome! This is a side project for me (SLF), -so things would go faster if other people are willing to pitch in. -Please use the GitHub pull request mechanism or send me an email -message. - -To build from scratch, use this recipe. If you're an experienced Git -user and wish to add my repository as a remote repository, be my -guest. Just resume the recipe at command #4. - -NOTE: The `dtrace-experiment+michal2` branch is used for changes that -can be applied to both R14B and R15 releases. - - % git clone git://github.com/slfritchie/otp.git - % cd otp - % git checkout -b dtrace-experiment+michal2 origin/dtrace-experiment+michal2 - % env ERL_TOP=`pwd` ./otp_build autoconf - % env ERL_TOP=`pwd` ./configure --enable-dtrace + whatever args you need - % env ERL_TOP=`pwd` make - -Then `make install` and then start an Erlang shell via -`/path/to/installed/bin/erl +A 8`. The Erlang shell's banner should -include `[dtrace]`. - -Try using this (ugly) DTrace command to watch file I/O probes in use -(tested on OS X only, sorry): - - dtrace -Z -n 'erlang*:::efile_drv-entry {printf("%d %d %s | %d | %s %s , %d %d %d", arg0, arg1, arg2 == NULL ? "" : copyinstr(arg2), arg3, arg4 == NULL ? "" : copyinstr(arg4), arg5 == NULL ? "" : copyinstr(arg5), arg6, arg7, arg8)} erlang*:::efile_drv-int* {printf("%d %d %d | %d", arg0, arg1, arg2, arg3);} erlang*:::efile_drv-return {printf("%d %d %s | %d | %d %d %d", arg0, arg1, arg2 == NULL ? "" : copyinstr(arg2), arg3, arg4, arg5, arg6 ) ; }' +As of R15B01, the dynamic trace code is included in the main OTP distribution, +although it's considered experimental. The main development of the dtrace code +still happens outside of Ericsson, but there is no need to fetch a patched +version of OTP to get the basic funtionality. Implementation summary ---------------------- -So far, most effort has been focused on the `efile_drv.erl` code, +So far, most effort has been focused on the `efile_drv.c` code, which implements most file I/O on behalf of the Erlang virtual machine. This driver also presents a big challenge: its use of an I/O worker pool (enabled by using the `erl +A 8` flag, for example) makes |