lkml.org 
[lkml]   [2015]   [May]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH] perf tools: Fix "Command" sort_entry's cmp and collapse function
Hi Jiri,

CC-ing Frederic as he wrote the comm change.

On Fri, May 15, 2015 at 05:54:28PM +0200, Jiri Olsa wrote:
> Currently the se_cmp and se_collapse use pointer comparison,
> which is ok for for testing equality of strings. It's not ok
> as comparing function for rbtree insertion, because it gives
> different results based on current pointer values.
>
> We saw test 32 (hists cumulation test) failing based on different
> environment setup. Having all sort functions straightened fix the
> test for us.

Can you elaborate it?

AFAIK comm string is shared among threads so pointer comparison and
'strcmp == 0' should have same result..

Thanks,
Namhyung


>
> Reported-by: Jan Stancek <jstancek@redhat.com>
> Link: http://lkml.kernel.org/n/tip-tklp6y27bseqjibcwn0py9up@git.kernel.org
> Signed-off-by: Jiri Olsa <jolsa@kernel.org>
> ---
> tools/perf/util/sort.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/tools/perf/util/sort.c b/tools/perf/util/sort.c
> index 4593f36ecc4c..09d4696fd9a1 100644
> --- a/tools/perf/util/sort.c
> +++ b/tools/perf/util/sort.c
> @@ -89,14 +89,14 @@ static int64_t
> sort__comm_cmp(struct hist_entry *left, struct hist_entry *right)
> {
> /* Compare the addr that should be unique among comm */
> - return comm__str(right->comm) - comm__str(left->comm);
> + return strcmp(comm__str(right->comm), comm__str(left->comm));
> }
>
> static int64_t
> sort__comm_collapse(struct hist_entry *left, struct hist_entry *right)
> {
> /* Compare the addr that should be unique among comm */
> - return comm__str(right->comm) - comm__str(left->comm);
> + return strcmp(comm__str(right->comm), comm__str(left->comm));
> }
>
> static int64_t
> --
> 1.9.3
>
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/


\
 
 \ /
  Last update: 2015-05-18 04:21    [W:0.059 / U:0.184 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site