linux-kernel - Re: [PATCH] kprobe: increase kprobe_hash

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Message-Id: <20081107184629.97eb5ec3.akpm@linux-foundation.org>
Date:	Fri, 7 Nov 2008 18:46:29 -0800
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Masami Hiramatsu <mhiramat@...hat.com>
Cc:	Ananth N Mavinakayanahalli <ananth@...ibm.com>,
	Jim Keniston <jkenisto@...ibm.com>,
	David Miller <davem@...emloft.net>,
	LKML <linux-kernel@...r.kernel.org>, maneesh@...ibm.com,
	Srikar Dronamraju <srikar@...ux.vnet.ibm.com>,
	Srinivasa Ds <srinivasa@...ibm.com>
Subject: Re: [PATCH] kprobe: increase kprobe_hash_table size

On Fri, 07 Nov 2008 21:33:49 -0500 Masami Hiramatsu <mhiramat@...hat.com> wrote:

> Not really. Hmm, I have to investigate more on this problem.

OK ;)

Meanwhile, how does this look?



From: Andrew Morton <akpm@...ux-foundation.org>

We only need the cacheline padding on SMP kernels.  Saves 6k:

   text    data     bss     dec     hex filename
   5713     388    2632    8733    221d kernel/kprobes.o
   5713     388    8840   14941    3a5d kernel/kprobes.o

Cc: Masami Hiramatsu <mhiramat@...hat.com>
Cc: Ananth N Mavinakayanahalli <ananth@...ibm.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
---

 kernel/kprobes.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff -puN kernel/kprobes.c~a kernel/kprobes.c
--- a/kernel/kprobes.c~a
+++ a/kernel/kprobes.c
@@ -72,7 +72,7 @@ static bool kprobe_enabled;
 DEFINE_MUTEX(kprobe_mutex);		/* Protects kprobe_table */
 static DEFINE_PER_CPU(struct kprobe *, kprobe_instance) = NULL;
 static struct {
-	spinlock_t lock ____cacheline_aligned;
+	spinlock_t lock ____cacheline_aligned_in_smp;
 } kretprobe_table_locks[KPROBE_TABLE_SIZE];
 
 static spinlock_t *kretprobe_table_lock_ptr(unsigned long hash)
_

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