linux-kernel - Re: [PATCH v2 0/4] perf: enable compression of record mode trace to save storage space

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Message-ID: <20190129104543.GJ4344@kernel.org>
Date:   Tue, 29 Jan 2019 11:45:43 +0100
From:   Arnaldo Carvalho de Melo <acme@...nel.org>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 0/4] perf: enable compression of record mode trace to
 save storage space

Em Mon, Jan 28, 2019 at 09:40:28AM +0300, Alexey Budankov escreveu:
> The patch set implements runtime trace compression for record mode and 
> trace file decompression for report mode. Zstandard API [1] is used for 
> compression/decompression of data that come from perf_events kernel 

Interesting, wasn't aware of this zstd library, I wonder if we can add
it and switch the other compression libraries we link against, so that
we're not adding one more library to the dep list of perf but removing
some instead, do you think this would be possible?

  $ ldd ~/bin/perf | wc -l
  30
  $ ldd ~/bin/perf | grep z
	liblzma.so.5 => /lib64/liblzma.so.5 (0x00007f3dcc356000)
	libz.so.1 => /lib64/libz.so.1 (0x00007f3dcb2aa000)
	libbz2.so.1 => /lib64/libbz2.so.1 (0x00007f3dcb218000)
  $

Humm, from the github page it says:

-----
The project is provided as an open-source dual BSD and GPLv2 licensed C
library, and a command line utility producing and decoding .zst, .gz,
.xz and .lz4 files. Should your project require another programming
language, a list of known ports and bindings is provided on Zstandard
homepage.
-----

So it would cover just liblzma and libz, right?

- Arnaldo