Hi Adrien,
On Wed, Apr 16, 2014 at 08:32:37AM +0100, Adrien BAK wrote:
> In the current version, when using perf record, if something goes wrong in
> tools/perf/builtin-record.c:375 session = perf_session__new(file,
> false, NULL);
> The error message:
> "Not enough memory for reading per file header"
> is issued. This error message seems to be outdated and is not very helpful.
> This patch propose to replace this error message by
> "Perf session creation failed"
>
> I believe this issue has been brought to lkml :
> https://lkml.org/lkml/2014/2/24/458
> although this patch only tackle a (small) part of the issue.
>
> Additionnaly, this patch improves error reporting in
> tools/perf/util/data.c open_file_write
> Currently, if the call to open fails, the user is unaware of it.
> This patch logs the error, before returning the error code to the caller.
>
> Signed-off-by: Adrien BAK <adrien....@metascale.org>
Whilst this patch (admittedly) only solves part of the problem, I think it
makes the error I encountered a lot easier to understand.
Thanks,
Reported-by: Will Deacon <will.dea...@arm.com>
Will
>
> ---
> diff --git a/tools/perf/builtin-record.c b/tools/perf/builtin-record.c
> index eb524f9..8ce62ef 100644
> --- a/tools/perf/builtin-record.c
> +++ b/tools/perf/builtin-record.c
> @@ -374,7 +374,7 @@ static int __cmd_record(struct record *rec, int
> argc, const char **argv)
>
> session = perf_session__new(file, false, NULL);
> if (session == NULL) {
> - pr_err("Not enough memory for reading perf file header\n");
> + pr_err("Perf session creation failed.\n");
> return -1;
> }
>
> diff --git a/tools/perf/util/data.c b/tools/perf/util/data.c
> index 1fbcd8b..ff2ced7 100644
> --- a/tools/perf/util/data.c
> +++ b/tools/perf/util/data.c
> @@ -86,10 +86,16 @@ static int open_file_read(struct perf_data_file *file)
>
> static int open_file_write(struct perf_data_file *file)
> {
> + int fd;
> if (check_backup(file))
> return -1;
>
> - return open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR);
> + fd = open(file->path, O_CREAT|O_RDWR|O_TRUNC, S_IRUSR|S_IWUSR);
> +
> + if (fd < 0)
> + pr_err("failed to open %s : %s\n", file->path, strerror(errno));
> +
> + return fd;
> }
>
> static int open_file(struct perf_data_file *file)
>
>
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