linux-kernel - [PATCH] tools lib fd array: Do not set fd as non blocking evlist

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Date:	Thu, 11 Sep 2014 17:09:43 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	linux-kernel@...r.kernel.org,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	Adrian Hunter <adrian.hunter@...el.com>,
	Borislav Petkov <bp@...e.de>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	David Ahern <dsahern@...il.com>,
	Frederic Weisbecker <fweisbec@...il.com>,
	Ingo Molnar <mingo@...nel.org>,
	Jean Pihet <jean.pihet@...aro.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Paul Mackerras <paulus@...ba.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Subject: [PATCH] tools lib fd array: Do not set fd as non blocking evlist

On Wed, Sep 10, 2014 at 11:08:46AM -0300, Arnaldo Carvalho de Melo wrote:

SNIP

> +}
> +
> +void fdarray__exit(struct fdarray *fda)
> +{
> +	free(fda->entries);
> +	fdarray__init(fda, 0);
> +}
> +
> +void fdarray__delete(struct fdarray *fda)
> +{
> +	fdarray__exit(fda);
> +	free(fda);
> +}
> +
> +int fdarray__add(struct fdarray *fda, int fd, short revents)
> +{
> +	if (fda->nr == fda->nr_alloc &&
> +	    fdarray__grow(fda, fda->nr_autogrow) < 0)
> +		return -ENOMEM;
> +
> +	fcntl(fd, F_SETFL, O_NONBLOCK);

also I spot this one and couldn't think of reason for it, attached
patch makes no behaviour difference for me..

I might be missing something, but I dont see any blocking operation
in perf related data reads. The git log history says it was there
since early days.

jirka


---
There's no reason for the current user of this API
to have non blocking fds. Also it should be up to
user to set this, not this object.

Cc: Adrian Hunter <adrian.hunter@...el.com>
Cc: Arnaldo Carvalho de Melo <acme@...hat.com>
Cc: Borislav Petkov <bp@...e.de>
Cc: Corey Ashford <cjashfor@...ux.vnet.ibm.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Frederic Weisbecker <fweisbec@...il.com>
Cc: Ingo Molnar <mingo@...nel.org>
Cc: Jean Pihet <jean.pihet@...aro.org>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Paul Mackerras <paulus@...ba.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Signed-off-by: Jiri Olsa <jolsa@...nel.org>
---
 tools/lib/api/fd/array.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/tools/lib/api/fd/array.c b/tools/lib/api/fd/array.c
index 3f6d1a0..0e636c4 100644
--- a/tools/lib/api/fd/array.c
+++ b/tools/lib/api/fd/array.c
@@ -78,7 +78,6 @@ int fdarray__add(struct fdarray *fda, int fd, short revents)
 	    fdarray__grow(fda, fda->nr_autogrow) < 0)
 		return -ENOMEM;
 
-	fcntl(fd, F_SETFL, O_NONBLOCK);
 	fda->entries[fda->nr].fd     = fd;
 	fda->entries[fda->nr].events = revents;
 	fda->nr++;
-- 
1.7.7.6


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