linux-kernel - [PATCH] spufs support multiple probes markers

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Date:	Tue, 12 Feb 2008 18:56:50 -0500
From:	Mathieu Desnoyers <compudj@...stal.dyndns.org>
To:	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Steven Rostedt <rostedt@...dmis.org>
Cc:	linux-kernel@...r.kernel.org
Subject: [PATCH] spufs support multiple probes markers

* Mathieu Desnoyers (mathieu.desnoyers@...ymtl.ca) wrote:
> * Andrew Morton (akpm@...ux-foundation.org) wrote:
> > 
> > fyi, I have this on hold because I spotted spufs build breakage,
> > but I haven't had time to investigate.  powerpc allmodconfig, iirc.
> 
> Christoph told me he would update his sputrace accordingly. Christoph,
> should I do the changes or let you do it ?
> 
> It's mostly the probe function prototype which changes from 
> 
> -typedef void marker_probe_func(const struct marker *mdata,
> -       void *private_data, const char *fmt, ...);
> 
> to
> 
> +typedef void marker_probe_func(void *probe_private, void *call_private,
> +               const char *fmt, va_list *args);
> 
> Where you receive an already ready va_list instead of having to call
> va_start/va_end in the probe.
> 
> Also, there is no more marker_arm/marker_disarm. It is now automatically
> done upon register/unregister.
> 
> Mathieu
> 

Update spufs to the new linux kernel markers API, which supports connecting
more than one probe to a single marker.

(compile-tested only)

Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>
CC: Christoph Hellwig <hch@...radead.org>
CC: "Frank Ch. Eigler" <fche@...hat.com>
CC: Steven Rostedt <rostedt@...dmis.org>
CC: Andrew Morton <akpm@...ux-foundation.org>
---
 arch/powerpc/platforms/cell/spufs/sputrace.c |   31 +++++++++------------------
 1 file changed, 11 insertions(+), 20 deletions(-)

Index: linux-2.6-lttng/arch/powerpc/platforms/cell/spufs/sputrace.c
===================================================================
--- linux-2.6-lttng.orig/arch/powerpc/platforms/cell/spufs/sputrace.c	2008-02-12 15:07:25.000000000 -0500
+++ linux-2.6-lttng/arch/powerpc/platforms/cell/spufs/sputrace.c	2008-02-12 15:11:39.000000000 -0500
@@ -146,34 +146,28 @@
 	wake_up(&sputrace_wait);
 }
 
-static void spu_context_event(const struct marker *mdata,
-		void *private, const char *format, ...)
+static void spu_context_event(void *probe_private, void *call_data,
+		const char *format, va_list *args)
 {
-	struct spu_probe *p = mdata->private;
-	va_list ap;
+	struct spu_probe *p = probe_private;
 	struct spu_context *ctx;
 	struct spu *spu;
 
-	va_start(ap, format);
-	ctx = va_arg(ap, struct spu_context *);
-	spu = va_arg(ap, struct spu *);
+	ctx = va_arg(*args, struct spu_context *);
+	spu = va_arg(*args, struct spu *);
 
 	sputrace_log_item(p->name, ctx, spu);
-	va_end(ap);
 }
 
-static void spu_context_nospu_event(const struct marker *mdata,
-		void *private, const char *format, ...)
+static void spu_context_nospu_event(void *probe_private, void *call_data,
+		const char *format, va_list *args)
 {
-	struct spu_probe *p = mdata->private;
-	va_list ap;
+	struct spu_probe *p = probe_private;
 	struct spu_context *ctx;
 
-	va_start(ap, format);
-	ctx = va_arg(ap, struct spu_context *);
+	ctx = va_arg(*args, struct spu_context *);
 
 	sputrace_log_item(p->name, ctx, NULL);
-	va_end(ap);
 }
 
 struct spu_probe spu_probes[] = {
@@ -219,10 +213,6 @@
 		if (error)
 			printk(KERN_INFO "Unable to register probe %s\n",
 					p->name);
-
-		error = marker_arm(p->name);
-		if (error)
-			printk(KERN_INFO "Unable to arm probe %s\n", p->name);
 	}
 
 	return 0;
@@ -238,7 +228,8 @@
 	int i;
 
 	for (i = 0; i < ARRAY_SIZE(spu_probes); i++)
-		marker_probe_unregister(spu_probes[i].name);
+		marker_probe_unregister(spu_probes[i].name,
+			spu_probes[i].probe_func, &spu_probes[i]);
 
 	remove_proc_entry("sputrace", NULL);
 	kfree(sputrace_log);


-- 
Mathieu Desnoyers
Computer Engineering Ph.D. Student, Ecole Polytechnique de Montreal
OpenPGP key fingerprint: 8CD5 52C3 8E3C 4140 715F  BA06 3F25 A8FE 3BAE 9A68
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