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#!/usr/sbin/dtrace -Zs
/*
* py_malloc.d - Python libc malloc analysis.
* Written for the Python DTrace provider.
*
* $Id: py_malloc.d 19 2007-09-12 07:47:59Z brendan $
*
* This is an expiremental script to identify who is calling malloc() for
* memory allocation, and to print distribution plots of the requested bytes.
* If a malloc() occured while in a Python function, then that function is
* identified as responsible; else the caller of malloc() is identified as
* responsible - which will be a function from the Python engine.
*
* USAGE: py_malloc.d { -p PID | -c cmd } # hit Ctrl-C to end
*
* Filename and function names are printed if available.
*
* COPYRIGHT: Copyright (c) 2007 Brendan Gregg.
*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License, Version 1.0 only
* (the "License"). You may not use this file except in compliance
* with the License.
*
* You can obtain a copy of the license at Docs/cddl1.txt
* or http://www.opensolaris.org/os/licensing.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* CDDL HEADER END
*
* 09-Sep-2007 Brendan Gregg Created this.
*/
#pragma D option quiet
dtrace:::BEGIN
{
printf("Tracing... Hit Ctrl-C to end.\n");
}
python$target:::function-entry
{
self->file = basename(copyinstr(arg0));
self->name = copyinstr(arg1);
}
python$target:::function-return
{
self->file = 0;
self->name = 0;
}
pid$target:libc:malloc:entry
/self->file != NULL/
{
@malloc_func_size[self->file, self->name] = sum(arg0);
@malloc_func_dist[self->file, self->name] = quantize(arg0);
}
pid$target:libc:malloc:entry
/self->name == NULL/
{
@malloc_lib_size[usym(ucaller)] = sum(arg0);
@malloc_lib_dist[usym(ucaller)] = quantize(arg0);
}
dtrace:::END
{
printf("\nPython malloc byte distributions by engine caller,\n\n");
printa(" %A, total bytes = %@d %@d\n", @malloc_lib_size,
@malloc_lib_dist);
printf("\nPython malloc byte distributions by Python file and ");
printf("function,\n\n");
printa(" %s, %s, bytes total = %@d %@d\n", @malloc_func_size,
@malloc_func_dist);
}
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