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From: Mark W. <ma...@so...> - 2019-05-31 13:11:52
|
https://sourceware.org/git/gitweb.cgi?p=valgrind.git;h=9616e9bc9a1950f70ab1abd1c6ca9abc3f26eb7f commit 9616e9bc9a1950f70ab1abd1c6ca9abc3f26eb7f Author: Mark Wielaard <ma...@kl...> Date: Fri May 31 15:11:35 2019 +0200 Hook up membarrier syscall for arm-linux. Diff: --- coregrind/m_syswrap/syswrap-arm-linux.c | 1 + 1 file changed, 1 insertion(+) diff --git a/coregrind/m_syswrap/syswrap-arm-linux.c b/coregrind/m_syswrap/syswrap-arm-linux.c index 3c5194d..5e8baf8 100644 --- a/coregrind/m_syswrap/syswrap-arm-linux.c +++ b/coregrind/m_syswrap/syswrap-arm-linux.c @@ -1014,6 +1014,7 @@ static SyscallTableEntry syscall_main_table[] = { LINXY(__NR_getrandom, sys_getrandom), // 384 LINXY(__NR_memfd_create, sys_memfd_create), // 385 + LINX_(__NR_membarrier, sys_membarrier), // 389 LINX_(__NR_copy_file_range, sys_copy_file_range), // 391 LINXY(__NR_statx, sys_statx), // 397 |
|
From: Philippe W. <phi...@sk...> - 2019-05-31 09:18:26
|
Julian and myself we just discussed the below on IRC.
The conclusion is that we do not believe the below patch should
be pushed upstream, for the following reason:
It is preferable that the xml format/behaviour is touched as less
as possible. Even if the below change is very probably
backward compatible with the existing xml readers, we must have
a clear benefit to do this change.
I just measured the speed of a leak search on an Intel i5 @2.8GHz.
The leak searcher is scanning 1GB of heap in 100_000 blocks
in about 1.3 seconds.
Also, there is no additional data recorded during the run for
the 'end of run' leak search.
So, the leak search speed is very probably not an issue.
If the issue is linked to the amount of leak errors output
in the xml file, this can be trimmed e.g. by using
--show-leak-kinds=none
and/or by using a suppression file suppressing all (or most)
of the leak errors.
I will in any case improve the manual to better document the effect
of --xml=yes on --leak-check, and maybe also indicate that
--show-leak-kinds=none can be used to reduce the xml output file
size if needed.
Thanks for the discussion
Philippe
On Sat, 2019-05-18 at 17:10 +0200, Philippe Waroquiers wrote:
> On Thu, 2019-05-16 at 07:34 -0700, John Reiser wrote:
>
> > The original poster has a point: --leak-check=full has a run-time cost,
> > and the intent of --leak-check=no is to avoid that cost as much as
> > possible. On a medium-to-large size program, just the presentation
> > of the leak report can take several seconds, not even counting the cost
> > of the [logical] garbage collection to compute the leak status,
> > or possibly any per-allocation cost to preserve enough data to compute leaks.
> > If the garbage collection involves demand paging using backing storage,
> > then the cost can be large. An explicit --leak-check=no should
> > override compiled-in assumptions about how much --xml-file= contains.
>
> The below patch implements the idea that an explicit --leak-check overrides
> the --leak-check=full default when --xml=yes is given.
>
> Before pushing this to HEAD, I would however prefer to have some feedback
> (e.g. from Julian) about this.
>
> Philippe
>
> diff --git a/NEWS b/NEWS
> index ba0f1285b..53038936c 100644
> --- a/NEWS
> +++ b/NEWS
> @@ -24,6 +24,9 @@ support for X86/macOS 10.13 and AMD64/macOS 10.13.
> * Massif:
>
> * Memcheck:
> + - The option --xml=yes used to unconditionally set --leak-check=full.
> + Now, when --xml=yes, --leck-check=full is used only if the user did
> + not explicitely give a --leak-check value.
>
> * ==================== OTHER CHANGES ====================
>
> diff --git a/memcheck/docs/mc-manual.xml b/memcheck/docs/mc-manual.xml
> index a993479a9..24a9c7fcc 100644
> --- a/memcheck/docs/mc-manual.xml
> +++ b/memcheck/docs/mc-manual.xml
> @@ -747,6 +747,8 @@ is <option>--errors-for-leak-kinds=definite,possible</option>
> in detail and/or counted as an error, as specified by the options
> <option>--show-leak-kinds</option> and
> <option>--errors-for-leak-kinds</option>. </para>
> + <para>If <varname>--xml=yes</varname> is given, the default value
> + is set to <varname>full</varname>. </para>
> </listitem>
> </varlistentry>
>
> diff --git a/memcheck/mc_main.c b/memcheck/mc_main.c
> index 253f091dc..a9ecab138 100644
> --- a/memcheck/mc_main.c
> +++ b/memcheck/mc_main.c
> @@ -5938,6 +5938,9 @@ Bool MC_(clo_partial_loads_ok) = True;
> Long MC_(clo_freelist_vol) = 20*1000*1000LL;
> Long MC_(clo_freelist_big_blocks) = 1*1000*1000LL;
> LeakCheckMode MC_(clo_leak_check) = LC_Summary;
> +/* user_clc is set to True if the user explicitly gave the clo option
> + --leak-check. If True, --xml will not change the value of --leak-check. */
> +Bool user_clc = False;
> VgRes MC_(clo_leak_resolution) = Vg_HighRes;
> UInt MC_(clo_show_leak_kinds) = R2S(Possible) | R2S(Unreached);
> UInt MC_(clo_error_for_leak_kinds) = R2S(Possible) | R2S(Unreached);
> @@ -6044,14 +6047,17 @@ static Bool mc_process_cmd_line_options(const HChar* arg)
> MC_(clo_freelist_big_blocks),
> 0, 10*1000*1000*1000LL) {}
>
> - else if VG_XACT_CLO(arg, "--leak-check=no",
> - MC_(clo_leak_check), LC_Off) {}
> + else if VG_XACT_CLO(arg, "--leak-check=no", MC_(clo_leak_check), LC_Off)
> + { user_clc = True; }
> else if VG_XACT_CLO(arg, "--leak-check=summary",
> - MC_(clo_leak_check), LC_Summary) {}
> + MC_(clo_leak_check), LC_Summary)
> + { user_clc = True; }
> else if VG_XACT_CLO(arg, "--leak-check=yes",
> - MC_(clo_leak_check), LC_Full) {}
> + MC_(clo_leak_check), LC_Full)
> + { user_clc = True; }
> else if VG_XACT_CLO(arg, "--leak-check=full",
> - MC_(clo_leak_check), LC_Full) {}
> + MC_(clo_leak_check), LC_Full)
> + { user_clc = True; }
>
> else if VG_XACT_CLO(arg, "--leak-resolution=low",
> MC_(clo_leak_resolution), Vg_LowRes) {}
> @@ -7727,8 +7733,9 @@ static void mc_post_clo_init ( void )
> {
> /* If we've been asked to emit XML, mash around various other
> options so as to constrain the output somewhat. */
> - if (VG_(clo_xml)) {
> - /* Extract as much info as possible from the leak checker. */
> + if (VG_(clo_xml) & !user_clc) {
> + /* Extract as much info as possible from the leak checker, unless
> + the user explicitly gave the --leak-check option. */
> MC_(clo_leak_check) = LC_Full;
> }
>
> diff --git a/memcheck/tests/xml1.vgtest b/memcheck/tests/xml1.vgtest
> index 6585b18f4..d0ee11da2 100644
> --- a/memcheck/tests/xml1.vgtest
> +++ b/memcheck/tests/xml1.vgtest
> @@ -1,3 +1,3 @@
> prog: xml1
> -vgopts: --xml=yes --xml-fd=2 --log-file=/dev/null --keep-stacktraces=alloc-then-free
> +vgopts: --xml=yes --xml-fd=2 --log-file=/dev/null --keep-stacktraces=alloc-then-free --leak-check=full
> stderr_filter: filter_xml
|