linux-kernel - Re: [PATCH v4 04/53] perf mmap: Lazily initialize zstd streams

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Message-ID: <ZWZNpdAGL58ViyNZ@kernel.org>
Date:   Tue, 28 Nov 2023 17:29:25 -0300
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Ian Rogers <irogers@...gle.com>
Cc:     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>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Nick Terrell <terrelln@...com>,
        Kan Liang <kan.liang@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        Kajol Jain <kjain@...ux.ibm.com>,
        Athira Rajeev <atrajeev@...ux.vnet.ibm.com>,
        Huacai Chen <chenhuacai@...nel.org>,
        Masami Hiramatsu <mhiramat@...nel.org>,
        Vincent Whitchurch <vincent.whitchurch@...s.com>,
        "Steinar H. Gunderson" <sesse@...gle.com>,
        Liam Howlett <liam.howlett@...cle.com>,
        Miguel Ojeda <ojeda@...nel.org>,
        Colin Ian King <colin.i.king@...il.com>,
        Dmitrii Dolgov <9erthalion6@...il.com>,
        Yang Jihong <yangjihong1@...wei.com>,
        Ming Wang <wangming01@...ngson.cn>,
        James Clark <james.clark@....com>,
        K Prateek Nayak <kprateek.nayak@....com>,
        Sean Christopherson <seanjc@...gle.com>,
        Leo Yan <leo.yan@...aro.org>,
        Ravi Bangoria <ravi.bangoria@....com>,
        German Gomez <german.gomez@....com>,
        Changbin Du <changbin.du@...wei.com>,
        Paolo Bonzini <pbonzini@...hat.com>, Li Dong <lidong@...o.com>,
        Sandipan Das <sandipan.das@....com>,
        liuwenyu <liuwenyu7@...wei.com>, linux-kernel@...r.kernel.org,
        linux-perf-users@...r.kernel.org
Subject: Re: [PATCH v4 04/53] perf mmap: Lazily initialize zstd streams

Em Tue, Nov 28, 2023 at 09:55:22AM -0800, Ian Rogers escreveu:
> On Tue, Nov 28, 2023 at 9:38 AM Arnaldo Carvalho de Melo <acme@...nel.org> wrote:
> > Em Tue, Nov 28, 2023 at 02:14:33PM -0300, Arnaldo Carvalho de Melo escreveu:
> > > Trying to fix this now:
> > >
> > >   6    20.59 alpine:3.18                   : FAIL gcc version 12.2.1 20220924 (Alpine 12.2.1_git20220924-r10)
> > >     In file included from util/zstd.c:5:
> > >     /git/perf-6.6.0-rc1/tools/perf/util/compress.h:34:1: error: unknown type name 'ssize_t'; did you mean 'size_t'?

> > So the problem was really the one above, that got fixed with the patch
> > below, that is what 'man size_t' documents on my fedora:38 system.
 
> Thanks, perhaps this is something clang-tidy, clang-format or similar
> could help with in the future. There was event IWYU discussion at LPC:
> https://lpc.events/event/17/contributions/1620/attachments/1228/2520/Linux%20Kernel%20Header%20Optimization.pdf

Yeah, that is interesting, I took a quick look and it looks promising.

I did this manually in various areas of the kernel and in tools/perf
from time to time, to speed up the building process, etc.

- Arnaldo