|To:||Deng-Cheng Zhu <email@example.com>, firstname.lastname@example.org|
|Subject:||Re: [PATCH v5 3/5] MIPS: perf: Reorganize contents of perf support files.|
|From:||David Daney <email@example.com>|
|Date:||Sat, 24 Sep 2011 13:44:00 -0700|
|Cc:||David Daney <firstname.lastname@example.org>, email@example.com, Peter Zijlstra <firstname.lastname@example.org>, Paul Mackerras <email@example.com>, Ingo Molnar <firstname.lastname@example.org>, Arnaldo Carvalho de Melo <email@example.com>, Dezhong Diao <firstname.lastname@example.org>, Gabor Juhos <email@example.com>|
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On 09/23/2011 07:50 PM, Deng-Cheng Zhu wrote:
2011/9/23 David Daney<firstname.lastname@example.org>The contents of arch/mips/kernel/perf_event.c and arch/mips/kernel/perf_event_mipsxx.c were divided in a seemingly ad hoc manner, with the first including the second. I moved all the hardware counter support code to perf_event_mipsxx.c and removed the gating #ifdefs to the Kconfig and Makefile. Now perf_event.c contains only the callchain support, everything else is in perf_event_mipsxx.cSorry for my late comment. I personally don't think it's a bad idea to use the original gating #ifdefs, because it allows sharing common code among different types of MIPS PMUs. Also, using CPU types as compiling conditions seems make sense. If you move the common hunk to perf_event_mipsxx.c, other CPUs like loognson series will have to duplicate these stuff.
I disagree, and here is why: Almost all the the code is mipsxx specific.If Loongson has a PMU that can reuse this code, it can just be added to perf_event_mipsxx.c along with all the other mips compatible PMUs
If this is not feasible, then it can have its own file and and common code can be removed to a common place at that time.
In any event, I have not seen any Loongson PMU patches, if someone has such patches I would be happy to consider changes that would make the kernel as a whole cleaner. But preventing cleanup and removal of a ton of #ifdefery in hope that Loongson patches may someday want something different is not what I would call a good way forward.
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