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441bfc5f51
This commit thoroughly overhauls DHAT, moving it out of the
"experimental" ghetto. It makes moderate changes to DHAT itself,
including dumping profiling data to a JSON format output file. It also
implements a new data viewer (as a web app, in dhat/dh_view.html).
The main benefits over the old DHAT are as follows.
- The separation of data collection and presentation means you can run a
program once under DHAT and then sort the data in various ways. Also,
full data is in the output file, and the viewer chooses what to omit.
- The data can be sorted in more ways than previously. Some of these
sorts involve useful filters such as "short-lived" and "zero reads or
zero writes".
- The tree structure view avoids the need to choose stack trace depth.
This avoids both the problem of not enough depth (when records that
should be distinct are combined, and may not contain enough
information to be actionable) and the problem of too much depth (when
records that should be combined are separated, making them seem less
important than they really are).
- Byte and block measures are shown with a percentage relative to the
global count, which helps gauge relative significance of different
parts of the profile.
- Byte and blocks measures are also shown with an allocation rate
(bytes and blocks per million instructions), which enables comparisons
across multiple profiles, even if those profiles represent different
workloads.
- Both global and per-node measurements are taken at the global heap
peak ("At t-gmax"), which gives Massif-like insight into the point of
peak memory use.
- The final/liftimes stats are a bit more useful than the old deaths
stats. (E.g. the old deaths stats didn't take into account lifetimes
of unfreed blocks.)
- The handling of realloc() has changed. The sequence `p = malloc(100);
realloc(p, 200);` now increases the total block count by 2 and the
total byte count by 300. Previously it increased them by 1 and 200.
The new handling is a more operational view that better reflects the
effect of allocations on performance. It makes a significant
difference in the results, giving paths involving reallocation (e.g.
repeated pushing to a growing vector) more prominence.
Other things of note:
- There is now testing, both regression tests that run within the
standard test suite, and viewer-specific tests that cannot run within
the standard test suite. The latter are run by loading
dh_view.html?test=1 in a web browser.
- The commit puts all tool lists in Makefiles (and similar files) in the
following consistent order: memcheck, cachegrind, callgrind, helgrind,
drd, massif, dhat, lackey, none; exp-sgcheck, exp-bbv.
- A lot of fields in dh_main.c have been given more descriptive names.
Those names now match those used in dh_view.js.
145 lines
5.2 KiB
C
145 lines
5.2 KiB
C
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/*--------------------------------------------------------------------*/
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/*--- A minimal setjmp/longjmp facility. pub_tool_libcsetjmp.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) 2010-2017 Mozilla Foundation
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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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/* Contributed by Julian Seward <jseward@acm.org> */
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#ifndef __PUB_TOOL_LIBCSETJMP_H
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#define __PUB_TOOL_LIBCSETJMP_H
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#include "pub_tool_basics.h" // UWord
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//--------------------------------------------------------------------
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// PURPOSE: Provides a minimal setjmp/longjmp facility, that saves/
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// restores integer registers, but not necessarily anything more.
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//--------------------------------------------------------------------
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/* This provides an extremely minimal setjmp/longjmp facility, in
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which only the host's integer registers are saved/restored. Or at
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least, that is the minimal guaranteed functionality.
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Until Apr 2011 we used __builtin_setjmp and __builtin_longjmp, but
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it appears that that is not always correctly implemented. See
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https://bugs.kde.org/show_bug.cgi?id=259977. So this module wraps
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those functions up and facilitates replacing them with our own
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implementations where necessary.
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*/
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/* --- !!! --- EXTERNAL HEADERS start --- !!! --- */
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#include <setjmp.h>
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/* --- !!! --- EXTERNAL HEADERS end --- !!! --- */
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/* Don't use jmp_buf, __builtin_setjmp or __builtin_longjmp directly.
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They don't always work reliably. Instead use these macros, which
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provide the opportunity to supply alternative implementations as
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necessary.
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Note that the abstraction is done with macros (ick) rather than
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functions and typedefs, since wrapping __builtin_setjmp up in a
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second function (eg, VG_(minimal_setjmp)) doesn't seem to work for
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whatever reason -- returns via a VG_(minimal_longjmp) go wrong.
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VG_MINIMAL_SETJMP stores the current integer register state in the
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supplied argument, and returns zero. VG_MINIMAL_LONGJMP resumes
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with the previously saved state, and returns a nonzero, word-sized
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value. The caller must test all bits of the value in order to make
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a zero/non-zero determination.
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*/
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#if defined(VGP_ppc32_linux)
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#define VG_MINIMAL_JMP_BUF(_name) UInt _name [32+1+1]
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__attribute__((returns_twice))
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UWord VG_MINIMAL_SETJMP(VG_MINIMAL_JMP_BUF(_env));
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__attribute__((noreturn))
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void VG_MINIMAL_LONGJMP(VG_MINIMAL_JMP_BUF(_env));
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#elif defined(VGP_ppc64be_linux) || defined(VGP_ppc64le_linux)
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#define VG_MINIMAL_JMP_BUF(_name) ULong _name [32+1+1]
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__attribute__((returns_twice))
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UWord VG_MINIMAL_SETJMP(VG_MINIMAL_JMP_BUF(_env));
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__attribute__((noreturn))
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void VG_MINIMAL_LONGJMP(VG_MINIMAL_JMP_BUF(_env));
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#elif defined(VGP_amd64_linux) || defined(VGP_amd64_darwin) || \
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defined(VGP_amd64_solaris)
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#define VG_MINIMAL_JMP_BUF(_name) ULong _name [16+1]
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__attribute__((returns_twice))
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UWord VG_MINIMAL_SETJMP(VG_MINIMAL_JMP_BUF(_env));
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__attribute__((noreturn))
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void VG_MINIMAL_LONGJMP(VG_MINIMAL_JMP_BUF(_env));
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#elif defined(VGP_x86_linux) || defined(VGP_x86_darwin) || \
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defined(VGP_x86_solaris)
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#define VG_MINIMAL_JMP_BUF(_name) UInt _name [8+1]
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__attribute__((returns_twice))
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__attribute__((regparm(1))) // this is critical; don't delete
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UWord VG_MINIMAL_SETJMP(VG_MINIMAL_JMP_BUF(_env));
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__attribute__((noreturn))
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__attribute__((regparm(1))) // ditto
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void VG_MINIMAL_LONGJMP(VG_MINIMAL_JMP_BUF(_env));
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#elif defined(VGP_mips32_linux)
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#define VG_MINIMAL_JMP_BUF(_name) ULong _name [104 / sizeof(ULong)]
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__attribute__((returns_twice))
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UWord VG_MINIMAL_SETJMP(VG_MINIMAL_JMP_BUF(_env));
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__attribute__((noreturn))
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void VG_MINIMAL_LONGJMP(VG_MINIMAL_JMP_BUF(_env));
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#elif defined(VGP_mips64_linux)
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#define VG_MINIMAL_JMP_BUF(_name) ULong _name [168 / sizeof(ULong)]
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__attribute__((returns_twice))
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UWord VG_MINIMAL_SETJMP(VG_MINIMAL_JMP_BUF(_env));
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__attribute__((noreturn))
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void VG_MINIMAL_LONGJMP(VG_MINIMAL_JMP_BUF(_env));
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#else
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/* The default implementation. */
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#define VG_MINIMAL_JMP_BUF(_name) jmp_buf _name
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#define VG_MINIMAL_SETJMP(_env) ((UWord)(__builtin_setjmp((_env))))
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#define VG_MINIMAL_LONGJMP(_env) __builtin_longjmp((_env),1)
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#endif
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#endif // __PUB_TOOL_LIBCSETJMP_H
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/*--------------------------------------------------------------------*/
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/*--- end pub_tool_libcsetjmp.h ---*/
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/*--------------------------------------------------------------------*/
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