linux-kernel - Re: [PATCH v2 3/4] perf record: enable runtime trace compression

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 12 Feb 2019 14:09:08 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...hat.com>,
        Peter Zijlstra <peterz@...radead.org>,
        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 3/4] perf record: enable runtime trace compression

On Mon, Feb 11, 2019 at 11:23:40PM +0300, Alexey Budankov wrote:

SNIP

> diff --git a/tools/perf/util/mmap.c b/tools/perf/util/mmap.c
> index 239e9a13c2b7..980784b77fe2 100644
> --- a/tools/perf/util/mmap.c
> +++ b/tools/perf/util/mmap.c
> @@ -156,6 +156,86 @@ void __weak auxtrace_mmap_params__set_idx(struct auxtrace_mmap_params *mp __mayb
>  {
>  }
>  
> +static ssize_t perf_mmap__capture(struct perf_mmap *md, int idx,
> +			perf_mmap__compress_fn_t compress, void *where)
> +{
> +	u64 head = perf_mmap__read_head(md);
> +	unsigned char *data = md->base + page_size;
> +	unsigned long size, size0 = 0;
> +	void *buf;
> +	int rc = 0;
> +	size_t mmap_len = perf_mmap__mmap_len(md);

again, this function seems like duplicate of perf_mmap__push,
can't you just overload the push callback?

thanks,
jirka