linux-kernel - Re: [PATCH v11 1/3]: perf util: map data buffer for preserving collected data

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Date:   Mon, 8 Oct 2018 12:50:49 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...nel.org>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Namhyung Kim <namhyung@...nel.org>,
        Andi Kleen <ak@...ux.intel.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v11 1/3]: perf util: map data buffer for preserving
 collected data

On Mon, Oct 08, 2018 at 09:14:29AM +0300, Alexey Budankov wrote:
> 
> The map->data buffer is used to preserve map->base profiling data 
> for writing to disk. AIO map->cblock is used to queue corresponding 
> map->data buffer for asynchronous writing.
> 
> Signed-off-by: Alexey Budankov <alexey.budankov@...ux.intel.com>
> ---
> Changes in v10:
>  - moved specific code to perf_mmap__aio_mmap(), perf_mmap__aio_munmap()
>  - adjusted error reporting by using %m
> Changes in v9:
>   - implemented NO_AIO and HAVE_AIO_SUPPORT defines to cover cases of 
>     libc implementations without Posix AIO API support
> Changes in v7:
>   - implemented handling record.aio setting from perfconfig file
>  Changes in v6:
>   - adjusted setting of priorities for cblocks;
>  Changes in v5:
>   - reshaped layout of data structures;
>   - implemented --aio option;
>  Changes in v4:
>   - converted mmap()/munmap() to malloc()/free() for mmap->data buffer management 
>  Changes in v2:
>   - converted zalloc() to calloc() for allocation of mmap_aio array,
>   - cleared typo and adjusted fallback branch code;
> ---
>  tools/perf/Makefile.config |  5 +++++
>  tools/perf/Makefile.perf   |  7 ++++++-
>  tools/perf/util/evlist.c   |  4 +++-
>  tools/perf/util/mmap.c     | 48 +++++++++++++++++++++++++++++++++++++++++++++-
>  tools/perf/util/mmap.h     | 11 +++++++++++
>  5 files changed, 72 insertions(+), 3 deletions(-)
> 
> diff --git a/tools/perf/Makefile.config b/tools/perf/Makefile.config
> index f6d1a03c7523..2e90f4ce9214 100644
> --- a/tools/perf/Makefile.config
> +++ b/tools/perf/Makefile.config
> @@ -355,6 +355,11 @@ endif # NO_LIBELF
>  
>  ifeq ($(feature-glibc), 1)
>    CFLAGS += -DHAVE_GLIBC_SUPPORT
> +  ifndef NO_AIO

hum, do we need NO_AIO? we have the --aio option to enable that right?
I guess BIONIC does not support aio, but but will it fail when it's
compiled in there?

jirka

> +    ifndef BIONIC
> +        CFLAGS += -DHAVE_AIO_SUPPORT
> +    endif
> +  endif
>  endif

SNIP