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6bd8cf1eae
information about the stack traces recorded by Valgrind. This can be used to analyse one possible cause of Valgrind high memory usage for some programs. At work, a big set of regression tests crashed out of memory under Valgrind. Two main causes for out of memory were identified: 1. big memory usage for stacktrace (exe contexts) recording by Valgrind 2. big number of partially initialised bytes. This patch adds a gdbsrv monitor command that output (very) detailed information about all the recorded exe context. This has been used to analyse the problem 1. above, showing the following identified causes for a (too) big nr of execontexts: A. When the JIT handles an unknown SP update, even when --track-origins=no, an execontext is (uselessly) created and recorded to track the (never used) origin of some uninitialised stack memory. This creates a whole bunch of 'one IP' execontexts. B. same problem in handling some system calls (at least the brk system calls always records an origin, even when --track-origins=yes). C. The Valgrind unwinder cannot properly unwind some stack traces. It unwinds a few frames, then go bezerk and stops at a "random" IP. This then causes the same "logical" stacktrace to be truncated and records thousands of times with this "differentiating" last IP. For problem cause 2 above ( a lot of partially initialised bytes), the idea is to similarly add another gdbsrv commands that will output statistics about which stack traces are causing a lot of uninitialised bytes. git-svn-id: svn://svn.valgrind.org/valgrind/trunk@13220
63 lines
2.4 KiB
C
63 lines
2.4 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- ExeContexts: long-lived, non-dup'd stack traces. ---*/
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/*--- pub_core_execontext.h ---*/
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/*--------------------------------------------------------------------*/
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/*
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This file is part of Valgrind, a dynamic binary instrumentation
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framework.
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Copyright (C) 2000-2012 Julian Seward
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jseward@acm.org
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307, USA.
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The GNU General Public License is contained in the file COPYING.
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*/
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#ifndef __PUB_CORE_EXECONTEXT_H
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#define __PUB_CORE_EXECONTEXT_H
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//--------------------------------------------------------------------
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// PURPOSE: This module provides an abstract data type, ExeContext,
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// which is a stack trace stored in such a way that duplicates are
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// avoided. This also facilitates fast comparisons if necessary.
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//--------------------------------------------------------------------
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#include "pub_tool_execontext.h"
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/* The maximum number of calls we're prepared to save in an ExeContext. */
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#define VG_DEEPEST_BACKTRACE 500
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// Print stats (informational only).
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// If with_stacktraces, outputs all the recorded stacktraces.
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extern void VG_(print_ExeContext_stats) ( Bool with_stacktraces );
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// Extract the StackTrace from an ExeContext.
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// (Minor hack: we use Addr* as the return type instead of StackTrace so
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// that modules #including this file don't also have to #include
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// pub_core_stacktrace.h also.)
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extern
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/*StackTrace*/Addr* VG_(get_ExeContext_StackTrace) ( ExeContext* e );
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#endif // __PUB_CORE_EXECONTEXT_H
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/*--------------------------------------------------------------------*/
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/*--- end ---*/
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/*--------------------------------------------------------------------*/
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