From: Glauber Costa <glommer@parallels.com>
To: Christoph Lameter <cl@linux.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>
Subject: Re: [PATCH 2/2] slab: move kmem_cache_free to common code
Date: Mon, 22 Oct 2012 19:10:24 +0400 [thread overview]
Message-ID: <508561E0.5000406@parallels.com> (raw)
In-Reply-To: <0000013a88eff593-50da3bb8-3294-41db-9c32-4e890ef6940a-000000@email.amazonses.com>
On 10/22/2012 06:45 PM, Christoph Lameter wrote:
> On Mon, 22 Oct 2012, Glauber Costa wrote:
>
>> + * kmem_cache_free - Deallocate an object
>> + * @cachep: The cache the allocation was from.
>> + * @objp: The previously allocated object.
>> + *
>> + * Free an object which was previously allocated from this
>> + * cache.
>> + */
>> +void kmem_cache_free(struct kmem_cache *s, void *x)
>> +{
>> + __kmem_cache_free(s, x);
>> + trace_kmem_cache_free(_RET_IP_, x);
>> +}
>> +EXPORT_SYMBOL(kmem_cache_free);
>> +
>
> This results in an additional indirection if tracing is off. Wonder if
> there is a performance impact?
>
if tracing is on, you mean?
Tracing already incurs overhead, not sure how much a function call would
add to the tracing overhead.
I would not be concerned with this, but I can measure, if you have any
specific workload in mind.
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WARNING: multiple messages have this Message-ID (diff)
From: Glauber Costa <glommer@parallels.com>
To: Christoph Lameter <cl@linux.com>
Cc: <linux-mm@kvack.org>, <linux-kernel@vger.kernel.org>,
Pekka Enberg <penberg@kernel.org>,
David Rientjes <rientjes@google.com>
Subject: Re: [PATCH 2/2] slab: move kmem_cache_free to common code
Date: Mon, 22 Oct 2012 19:10:24 +0400 [thread overview]
Message-ID: <508561E0.5000406@parallels.com> (raw)
In-Reply-To: <0000013a88eff593-50da3bb8-3294-41db-9c32-4e890ef6940a-000000@email.amazonses.com>
On 10/22/2012 06:45 PM, Christoph Lameter wrote:
> On Mon, 22 Oct 2012, Glauber Costa wrote:
>
>> + * kmem_cache_free - Deallocate an object
>> + * @cachep: The cache the allocation was from.
>> + * @objp: The previously allocated object.
>> + *
>> + * Free an object which was previously allocated from this
>> + * cache.
>> + */
>> +void kmem_cache_free(struct kmem_cache *s, void *x)
>> +{
>> + __kmem_cache_free(s, x);
>> + trace_kmem_cache_free(_RET_IP_, x);
>> +}
>> +EXPORT_SYMBOL(kmem_cache_free);
>> +
>
> This results in an additional indirection if tracing is off. Wonder if
> there is a performance impact?
>
if tracing is on, you mean?
Tracing already incurs overhead, not sure how much a function call would
add to the tracing overhead.
I would not be concerned with this, but I can measure, if you have any
specific workload in mind.
next prev parent reply other threads:[~2012-10-22 15:10 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-10-22 14:05 [PATCH 0/2] move kmem_cache_free to common code Glauber Costa
2012-10-22 14:05 ` Glauber Costa
2012-10-22 14:05 ` [PATCH 1/2] slab: commonize slab_cache field in struct page Glauber Costa
2012-10-22 14:05 ` Glauber Costa
2012-10-22 14:44 ` Christoph Lameter
2012-10-22 14:44 ` Christoph Lameter
2012-10-24 8:58 ` Pekka Enberg
2012-10-24 8:58 ` Pekka Enberg
2012-10-22 14:05 ` [PATCH 2/2] slab: move kmem_cache_free to common code Glauber Costa
2012-10-22 14:05 ` Glauber Costa
2012-10-22 14:45 ` Christoph Lameter
2012-10-22 14:45 ` Christoph Lameter
2012-10-22 15:10 ` Glauber Costa [this message]
2012-10-22 15:10 ` Glauber Costa
2012-10-23 0:48 ` JoonSoo Kim
2012-10-23 0:48 ` JoonSoo Kim
2012-10-23 8:07 ` Glauber Costa
2012-10-23 8:07 ` Glauber Costa
2012-10-23 10:52 ` Glauber Costa
2012-10-23 10:52 ` Glauber Costa
2012-10-23 15:43 ` JoonSoo Kim
2012-10-23 15:43 ` JoonSoo Kim
2012-10-24 8:31 ` Glauber Costa
2012-10-24 8:31 ` Glauber Costa
2012-10-24 13:39 ` Glauber Costa
2012-10-24 13:39 ` Glauber Costa
2012-10-23 14:12 ` Christoph Lameter
2012-10-23 14:12 ` Christoph Lameter
2012-10-23 14:15 ` Glauber Costa
2012-10-23 14:15 ` Glauber Costa
2012-10-23 14:34 ` Christoph Lameter
2012-10-23 14:34 ` Christoph Lameter
2012-10-23 18:16 ` Christoph Lameter
2012-10-23 18:16 ` Christoph Lameter
2012-10-24 8:56 ` Pekka Enberg
2012-10-24 8:56 ` Pekka Enberg
2012-10-24 10:03 ` Glauber Costa
2012-10-24 10:03 ` Glauber Costa
2012-10-24 8:56 ` Pekka Enberg
2012-10-24 8:56 ` Pekka Enberg
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