[PATCH] perf top: Fix annoying fallback message on older kernel

[PATCH] perf top: Fix annoying fallback message on older kernel

[kan.liang]

From: Kan Liang <Kan.liang@intel.com>

On older (v4.4) kernels, the annoying fallback message can be observed
in 'perf top'.

The 'perf top' has been changed to overwrite mode since
'commit ebebbf082357 ("perf top: Switch default mode to overwrite mode")'
For the older kernels which don't have overwrite mode support, the 'perf
top' will fall back to non-overwrite mode and print out the fallback
message by ui__warning, which needs user's input to close.

The fallback message is not critical message for end users. Turning it
to debug message which is printed when running with -vv.

Fixes: ebebbf082357 ("perf top: Switch default mode to overwrite mode")
Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Kan Liang <Kan.liang@intel.com>
---
 tools/perf/builtin-top.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index b7c823b..35ac016 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -991,7 +991,7 @@ static int perf_top_overwrite_fallback(struct perf_top *top,
 	evlist__for_each_entry(evlist, counter)
 		counter->attr.write_backward = false;
 	opts->overwrite = false;
-	ui__warning("fall back to non-overwrite mode\n");
+	pr_debug2("fall back to non-overwrite mode\n");
 	return 1;
 }
 
-- 
2.7.4

Re: [PATCH] perf top: Fix annoying fallback message on older kernel

[Arnaldo Carvalho de Melo]

Em Mon, Feb 26, 2018 at 10:17:10AM -0800, kan.liang@intel.com escreveu:
> The fallback message is not critical message for end users. Turning it
> to debug message which is printed when running with -vv.
 
> Fixes: ebebbf082357 ("perf top: Switch default mode to overwrite mode")
> Reported-by: Ingo Molnar <mingo@kernel.org>

Thanks, applied.

- Arnaldo

Re: [PATCH] perf top: Fix annoying fallback message on older kernel

[Ingo Molnar]

* kan.liang@intel.com <kan.liang@intel.com> wrote:

> From: Kan Liang <Kan.liang@intel.com>
> 
> On older (v4.4) kernels, the annoying fallback message can be observed
> in 'perf top'.
> 
> The 'perf top' has been changed to overwrite mode since
> 'commit ebebbf082357 ("perf top: Switch default mode to overwrite mode")'
> For the older kernels which don't have overwrite mode support, the 'perf
> top' will fall back to non-overwrite mode and print out the fallback
> message by ui__warning, which needs user's input to close.
> 
> The fallback message is not critical message for end users. Turning it
> to debug message which is printed when running with -vv.
> 
> Fixes: ebebbf082357 ("perf top: Switch default mode to overwrite mode")
> Reported-by: Ingo Molnar <mingo@kernel.org>
> Signed-off-by: Kan Liang <Kan.liang@intel.com>
> ---
>  tools/perf/builtin-top.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
> index b7c823b..35ac016 100644
> --- a/tools/perf/builtin-top.c
> +++ b/tools/perf/builtin-top.c
> @@ -991,7 +991,7 @@ static int perf_top_overwrite_fallback(struct perf_top *top,
>  	evlist__for_each_entry(evlist, counter)
>  		counter->attr.write_backward = false;
>  	opts->overwrite = false;
> -	ui__warning("fall back to non-overwrite mode\n");
> +	pr_debug2("fall back to non-overwrite mode\n");
>  	return 1;
>  }

Thanks!

	Ingo

[tip:perf/core] perf top: Fix annoying fallback message on older kernels

[tip-bot for Kan Liang]

Commit-ID:  853745f5e6d95faaae6381c9a01dbd43de992fb3
Gitweb:     https://git.kernel.org/tip/853745f5e6d95faaae6381c9a01dbd43de992fb3
Author:     Kan Liang <Kan.liang@intel.com>
AuthorDate: Mon, 26 Feb 2018 10:17:10 -0800
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 26 Feb 2018 16:04:08 -0300

perf top: Fix annoying fallback message on older kernels

On older (e.g. v4.4) kernels, an annoying fallback message can be
observed in 'perf top':

	┌─Warning:──────────────────────┐
	│fall back to non-overwrite mode│
	│                               │
	│                               │
	│Press any key...               │
	└───────────────────────────────┘

The 'perf top' utility has been changed to overwrite mode since commit
ebebbf082357 ("perf top: Switch default mode to overwrite mode").

For older kernels which don't have overwrite mode support, 'perf top'
will fall back to non-overwrite mode and print out the fallback message
using ui__warning(), which needs user's input to close.

The fallback message is not critical for end users. Turning it to debug
message which is printed when running with -vv.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Fixes: ebebbf082357 ("perf top: Switch default mode to overwrite mode")
Link: http://lkml.kernel.org/r/1519669030-176549-1-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-top.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index b7c823ba8374..35ac016fcb98 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -991,7 +991,7 @@ static int perf_top_overwrite_fallback(struct perf_top *top,
 	evlist__for_each_entry(evlist, counter)
 		counter->attr.write_backward = false;
 	opts->overwrite = false;
-	ui__warning("fall back to non-overwrite mode\n");
+	pr_debug2("fall back to non-overwrite mode\n");
 	return 1;
 }
 

[tip:perf/urgent] perf top: Fix annoying fallback message on older kernels

[tip-bot for Kan Liang]

Commit-ID:  626af862da9c650e80bdea44684be9334f8eb75b
Gitweb:     https://git.kernel.org/tip/626af862da9c650e80bdea44684be9334f8eb75b
Author:     Kan Liang <Kan.liang@intel.com>
AuthorDate: Mon, 26 Feb 2018 10:17:10 -0800
Committer:  Arnaldo Carvalho de Melo <acme@redhat.com>
CommitDate: Mon, 5 Mar 2018 11:48:56 -0300

perf top: Fix annoying fallback message on older kernels

On older (e.g. v4.4) kernels, an annoying fallback message can be
observed in 'perf top':

	┌─Warning:──────────────────────┐
	│fall back to non-overwrite mode│
	│                               │
	│                               │
	│Press any key...               │
	└───────────────────────────────┘

The 'perf top' utility has been changed to overwrite mode since commit
ebebbf082357 ("perf top: Switch default mode to overwrite mode").

For older kernels which don't have overwrite mode support, 'perf top'
will fall back to non-overwrite mode and print out the fallback message
using ui__warning(), which needs user's input to close.

The fallback message is not critical for end users. Turning it to debug
message which is printed when running with -vv.

Reported-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Kan Liang <kan.liang@intel.com>
Cc: Kan Liang <kan.liang@intel.com>
Fixes: ebebbf082357 ("perf top: Switch default mode to overwrite mode")
Link: http://lkml.kernel.org/r/1519669030-176549-1-git-send-email-kan.liang@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---
 tools/perf/builtin-top.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/tools/perf/builtin-top.c b/tools/perf/builtin-top.c
index b7c823ba8374..35ac016fcb98 100644
--- a/tools/perf/builtin-top.c
+++ b/tools/perf/builtin-top.c
@@ -991,7 +991,7 @@ static int perf_top_overwrite_fallback(struct perf_top *top,
 	evlist__for_each_entry(evlist, counter)
 		counter->attr.write_backward = false;
 	opts->overwrite = false;
-	ui__warning("fall back to non-overwrite mode\n");
+	pr_debug2("fall back to non-overwrite mode\n");
 	return 1;
 }