From: Peter Zijlstra <peterz@infradead.org>
To: Ingo Molnar <mingo@kernel.org>
Cc: George Spelvin <linux@horizon.com>,
dave@sr71.net, linux-kernel@vger.kernel.org, linux-mm@kvack.org,
linux@rasmusvillemoes.dk, riel@redhat.com, rientjes@google.com,
torvalds@linux-foundation.org
Subject: Re: [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info
Date: Tue, 25 Aug 2015 14:46:55 +0200 [thread overview]
Message-ID: <20150825124655.GQ16853@twins.programming.kicks-ass.net> (raw)
In-Reply-To: <20150823081750.GA28349@gmail.com>
On Sun, Aug 23, 2015 at 10:17:51AM +0200, Ingo Molnar wrote:
> +static u64 vmap_info_gen;
> +static u64 vmap_info_cache_gen;
> +void get_vmalloc_info(struct vmalloc_info *vmi)
> +{
> + u64 gen = READ_ONCE(vmap_info_gen);
> +
> + /*
> + * If the generation counter of the cache matches that of
> + * the vmalloc generation counter then return the cache:
> + */
> + if (READ_ONCE(vmap_info_cache_gen) == gen) {
Why are those things u64? It has the obvious down-side that you still
get split loads on 32bit machines.
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prev parent reply other threads:[~2015-08-25 12:47 UTC|newest]
Thread overview: 25+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-08-23 4:48 [PATCH 0/3] mm/vmalloc: Cache the /proc/meminfo vmalloc statistics George Spelvin
2015-08-23 6:04 ` Ingo Molnar
2015-08-23 6:46 ` George Spelvin
2015-08-23 8:17 ` [PATCH 3/3 v3] mm/vmalloc: Cache the vmalloc memory info Ingo Molnar
2015-08-23 20:53 ` Rasmus Villemoes
2015-08-24 6:58 ` Ingo Molnar
2015-08-24 8:39 ` Rasmus Villemoes
2015-08-23 21:56 ` Rasmus Villemoes
2015-08-24 7:00 ` Ingo Molnar
2015-08-25 16:39 ` Linus Torvalds
2015-08-25 17:03 ` Linus Torvalds
2015-08-24 1:04 ` George Spelvin
2015-08-24 7:34 ` [PATCH 3/3 v4] " Ingo Molnar
2015-08-24 7:47 ` Ingo Molnar
2015-08-24 7:50 ` [PATCH 3/3 v5] " Ingo Molnar
2015-08-24 12:54 ` George Spelvin
2015-08-25 9:56 ` [PATCH 3/3 v6] " Ingo Molnar
2015-08-25 10:36 ` George Spelvin
2015-08-25 12:59 ` Peter Zijlstra
2015-08-25 14:19 ` Rasmus Villemoes
2015-08-25 15:11 ` George Spelvin
2015-08-24 13:11 ` [PATCH 3/3 v4] " John Stoffel
2015-08-24 15:11 ` George Spelvin
2015-08-24 15:55 ` John Stoffel
2015-08-25 12:46 ` Peter Zijlstra [this message]
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