linux-kernel - Re: [PATCH v4 00/18] Mutex wrapper, locking and memory leak fixes

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Message-ID: <Ywo1yt/2liQwDQot@kernel.org>
Date:   Sat, 27 Aug 2022 12:18:34 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Adrian Hunter <adrian.hunter@...el.com>
Cc:     Ian Rogers <irogers@...gle.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Darren Hart <dvhart@...radead.org>,
        Davidlohr Bueso <dave@...olabs.net>,
        André Almeida <andrealmeid@...lia.com>,
        Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Tom Rix <trix@...hat.com>, Weiguo Li <liwg06@...mail.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Thomas Richter <tmricht@...ux.ibm.com>,
        Ravi Bangoria <ravi.bangoria@....com>,
        Dario Petrillo <dario.pk1@...il.com>,
        Hewenliang <hewenliang4@...wei.com>,
        yaowenbin <yaowenbin1@...wei.com>,
        Wenyu Liu <liuwenyu7@...wei.com>,
        Song Liu <songliubraving@...com>,
        Andrii Nakryiko <andrii@...nel.org>,
        Dave Marchevsky <davemarchevsky@...com>,
        Leo Yan <leo.yan@...aro.org>,
        Kim Phillips <kim.phillips@....com>,
        Pavithra Gurushankar <gpavithrasha@...il.com>,
        Alexandre Truong <alexandre.truong@....com>,
        Quentin Monnet <quentin@...valent.com>,
        William Cohen <wcohen@...hat.com>,
        Andres Freund <andres@...razel.de>,
        Martin Liška <mliska@...e.cz>,
        Colin Ian King <colin.king@...el.com>,
        James Clark <james.clark@....com>,
        Fangrui Song <maskray@...gle.com>,
        Stephane Eranian <eranian@...gle.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Alexey Bayduraev <alexey.v.bayduraev@...ux.intel.com>,
        Riccardo Mancini <rickyman7@...il.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Zechuan Chen <chenzechuan1@...wei.com>,
        Jason Wang <wangborong@...rlc.com>,
        Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        Remi Bernon <rbernon@...eweavers.com>,
        linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        bpf@...r.kernel.org, llvm@...ts.linux.dev
Subject: Re: [PATCH v4 00/18] Mutex wrapper, locking and memory leak fixes

Em Sat, Aug 27, 2022 at 10:04:44AM +0300, Adrian Hunter escreveu:
> On 26/08/22 19:40, Ian Rogers wrote:
> > When fixing a locking race and memory leak in:
> > https://lore.kernel.org/linux-perf-users/20211118193714.2293728-1-irogers@google.com/
> > 
> > It was requested that debug mutex code be separated out into its own
> > files. This was, in part, done by Pavithra Gurushankar in:
> > https://lore.kernel.org/lkml/20220727111954.105118-1-gpavithrasha@gmail.com/
> > 
> > These patches fix issues with the previous patches, add in the
> > original dso->nsinfo fix and then build on our mutex wrapper with
> > clang's -Wthread-safety analysis. The analysis found missing unlocks
> > in builtin-sched.c which are fixed and -Wthread-safety is enabled by
> > default when building with clang.
> > 
> > v4. Adds a comment for the trylock result, fixes the new line (missed
> >     in v3) and removes two blank lines as suggested by Adrian Hunter.
> > v3. Adds a missing new line to the error messages and removes the
> >     pshared argument to mutex_init by having two functions, mutex_init
> >     and mutex_init_pshared. These changes were suggested by Adrian Hunter.
> > v2. Breaks apart changes that s/pthread_mutex/mutex/g and the lock
> >     annotations as requested by Arnaldo and Namhyung. A boolean is
> >     added to builtin-sched.c to terminate thread funcs rather than
> >     leaving them blocked on delted mutexes.
> > 
> > Ian Rogers (17):
> >   perf bench: Update use of pthread mutex/cond
> >   perf tests: Avoid pthread.h inclusion
> >   perf hist: Update use of pthread mutex
> >   perf bpf: Remove unused pthread.h include
> >   perf lock: Remove unused pthread.h include
> >   perf record: Update use of pthread mutex
> >   perf sched: Update use of pthread mutex
> >   perf ui: Update use of pthread mutex
> >   perf mmap: Remove unnecessary pthread.h include
> >   perf dso: Update use of pthread mutex
> >   perf annotate: Update use of pthread mutex
> >   perf top: Update use of pthread mutex
> >   perf dso: Hold lock when accessing nsinfo
> >   perf mutex: Add thread safety annotations
> >   perf sched: Fixes for thread safety analysis
> >   perf top: Fixes for thread safety analysis
> >   perf build: Enable -Wthread-safety with clang
> > 
> > Pavithra Gurushankar (1):
> >   perf mutex: Wrapped usage of mutex and cond
> 
> For all patches except 9 and 16
> 
> Reviewed-by: Adrian Hunter <adrian.hunter@...el.com>

Added it, did the usual round of tests and pushed out perf/core, we can
continue from there.

It also contains Adrian's "multiple recording time ranges" series.

Thanks!

- Arnaldo