linux-kernel - Re: [PATCH v14 01/22] tracing: Update some tracing

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Date:	Thu, 25 Feb 2016 08:54:47 -0600
From:	Tom Zanussi <tom.zanussi@...ux.intel.com>
To:	平松雅巳 /
	 HIRAMATU，MASAMI 
	<masami.hiramatsu.pt@...achi.com>
Cc:	"rostedt@...dmis.org" <rostedt@...dmis.org>,
	"namhyung@...nel.org" <namhyung@...nel.org>,
	"josh@...htriplett.org" <josh@...htriplett.org>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"mathieu.desnoyers@...icios.com" <mathieu.desnoyers@...icios.com>,
	"peterz@...radead.org" <peterz@...radead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v14 01/22] tracing: Update some tracing_map constants
 and comments

Hi Masami,

On Thu, 2016-02-25 at 05:55 +0000, 平松雅巳 / HIRAMATU，MASAMI wrote:
> Hi Tom,
> 
> From: Tom Zanussi [mailto:tom.zanussi@...ux.intel.com]
> >
> >Make it clear exactly how many keys and values are supported through
> >better defines, and add 1 to the vals count, since normally clients
> >want support for at least a hitcount and two other values.
> 
> OK, but would that (increment the vals count) be possible to apply
> later patch? I think we'd better make this a cleanup patch.
> 

It's just changing the default VALS_MAX from 2 to 3, and all the
following patches were updated to use the new constants.  I could change
that value to 2 again, and then a later patch to up it to 3, but I don't
see the problem with starting at 3.  Am I missing something? 

Thanks,

Tom

> Thank you,
> 
> >
> >Also, note the error return value for tracing_map_add_key/val_field()
> >in the comments.
> >
> >Signed-off-by: Tom Zanussi <tom.zanussi@...ux.intel.com>
> >---
> > kernel/trace/tracing_map.c | 4 ++--
> > kernel/trace/tracing_map.h | 5 +++--
> > 2 files changed, 5 insertions(+), 4 deletions(-)
> >
> >diff --git a/kernel/trace/tracing_map.c b/kernel/trace/tracing_map.c
> >index dd6401d..e0f1729 100644
> >--- a/kernel/trace/tracing_map.c
> >+++ b/kernel/trace/tracing_map.c
> >@@ -163,7 +163,7 @@ static int tracing_map_add_field(struct tracing_map *map,
> >  * tracing_map_update_sum() or reading it via tracing_map_read_sum().
> >  *
> >  * Return: The index identifying the field in the map and associated
> >- * tracing_map_elts.
> >+ * tracing_map_elts, or -EINVAL on error.
> >  */
> > int tracing_map_add_sum_field(struct tracing_map *map)
> > {
> >@@ -184,7 +184,7 @@ int tracing_map_add_sum_field(struct tracing_map *map)
> >  * the key referenced by this key field resides.
> >  *
> >  * Return: The index identifying the field in the map and associated
> >- * tracing_map_elts.
> >+ * tracing_map_elts, or -EINVAL on error.
> >  */
> > int tracing_map_add_key_field(struct tracing_map *map,
> > 			      unsigned int offset,
> >diff --git a/kernel/trace/tracing_map.h b/kernel/trace/tracing_map.h
> >index 7571825..b575d0b 100644
> >--- a/kernel/trace/tracing_map.h
> >+++ b/kernel/trace/tracing_map.h
> >@@ -5,9 +5,10 @@
> > #define TRACING_MAP_BITS_MAX		17
> > #define TRACING_MAP_BITS_MIN		7
> >
> >-#define TRACING_MAP_FIELDS_MAX		4
> > #define TRACING_MAP_KEYS_MAX		2
> >-
> >+#define TRACING_MAP_VALS_MAX		3
> >+#define TRACING_MAP_FIELDS_MAX		(TRACING_MAP_KEYS_MAX + \
> >+					 TRACING_MAP_VALS_MAX)
> > #define TRACING_MAP_SORT_KEYS_MAX	2
> >
> > typedef int (*tracing_map_cmp_fn_t) (void *val_a, void *val_b);
> >--
> >1.9.3
>