linux-kernel - Re: [PATCH v3 7/8] perf python: Switch module to linking libraries from building source

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Date: Tue, 25 Jun 2024 13:24:06 +0100
From: James Clark <james.clark@....com>
To: Namhyung Kim <namhyung@...nel.org>, Ian Rogers <irogers@...gle.com>
Cc: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>,
 Arnaldo Carvalho de Melo <acme@...nel.org>,
 Mark Rutland <mark.rutland@....com>,
 Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
 Jiri Olsa <jolsa@...nel.org>, Adrian Hunter <adrian.hunter@...el.com>,
 Kan Liang <kan.liang@...ux.intel.com>, John Garry <john.g.garry@...cle.com>,
 Will Deacon <will@...nel.org>, Mike Leach <mike.leach@...aro.org>,
 Leo Yan <leo.yan@...ux.dev>, Guo Ren <guoren@...nel.org>,
 Paul Walmsley <paul.walmsley@...ive.com>, Palmer Dabbelt
 <palmer@...belt.com>, Albert Ou <aou@...s.berkeley.edu>,
 Suzuki K Poulose <suzuki.poulose@....com>,
 Yicong Yang <yangyicong@...ilicon.com>,
 Jonathan Cameron <jonathan.cameron@...wei.com>,
 Miguel Ojeda <ojeda@...nel.org>, Alex Gaynor <alex.gaynor@...il.com>,
 Wedson Almeida Filho <wedsonaf@...il.com>, Boqun Feng
 <boqun.feng@...il.com>, Gary Guo <gary@...yguo.net>,
 Björn Roy Baron <bjorn3_gh@...tonmail.com>,
 Benno Lossin <benno.lossin@...ton.me>,
 Andreas Hindborg <a.hindborg@...sung.com>, Alice Ryhl
 <aliceryhl@...gle.com>, Nick Terrell <terrelln@...com>,
 Ravi Bangoria <ravi.bangoria@....com>, Kees Cook <keescook@...omium.org>,
 Andrei Vagin <avagin@...gle.com>, Athira Jajeev
 <atrajeev@...ux.vnet.ibm.com>, Oliver Upton <oliver.upton@...ux.dev>,
 Ze Gao <zegao2021@...il.com>, linux-kernel@...r.kernel.org,
 linux-perf-users@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
 linux-csky@...r.kernel.org, linux-riscv@...ts.infradead.org,
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 bpf@...r.kernel.org
Subject: Re: [PATCH v3 7/8] perf python: Switch module to linking libraries
 from building source



On 24/06/2024 23:26, Namhyung Kim wrote:
> On Thu, Jun 13, 2024 at 04:31:21PM -0700, Ian Rogers wrote:
>> setup.py was building most perf sources causing setup.py to mimic the
>> Makefile logic as well as flex/bison code to be stubbed out, due to
>> complexity building. By using libraries fewer functions are stubbed
>> out, the build is faster and the Makefile logic is reused which should
>> simplify updating. The libraries are passed through LDFLAGS to avoid
>> complexity in python.
>>
>> Force the -fPIC flag for libbpf.a to ensure it is suitable for linking
>> into the perf python module.
>>
>> Signed-off-by: Ian Rogers <irogers@...gle.com>
>> Reviewed-by: James Clark <james.clark@....com>
>> ---
>>  tools/perf/Makefile.config |   5 +
>>  tools/perf/Makefile.perf   |   6 +-
>>  tools/perf/util/python.c   | 271 ++++++++++++++-----------------------
>>  tools/perf/util/setup.py   |  33 +----
>>  4 files changed, 110 insertions(+), 205 deletions(-)
>>
>> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
>> index 7f1e016a9253..639be696f597 100644
>> --- a/tools/perf/Makefile.config
>> +++ b/tools/perf/Makefile.config
>> @@ -910,6 +910,11 @@ else
>>           endif
>>           CFLAGS += -DHAVE_LIBPYTHON_SUPPORT
>>           $(call detected,CONFIG_LIBPYTHON)
>> +	 ifeq ($(filter -fPIC,$(CFLAGS)),)
> 
> Nitpick: mixed TAB and SPACEs.
> 
> 
>> +           # Building a shared library requires position independent code.
>> +           CFLAGS += -fPIC
>> +           CXXFLAGS += -fPIC
>> +         endif
> 
> 
> I'm curious if it's ok for static libraries too..
> 
> Thanks,
> Namhyung
> 

I think I tested the whole set with a static build so it should be ok.

> 
>>        endif
>>      endif
>>    endif