From: Andrew Morton <akpm@linux-foundation.org>
To: Catalin Marinas <catalin.marinas@arm.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Michal Hocko <mhocko@kernel.org>,
Matthew Wilcox <willy@infradead.org>, Qian Cai <cai@lca.pw>
Subject: Re: [PATCH v2] mm: kmemleak: Use mempool allocations for kmemleak objects
Date: Tue, 30 Jul 2019 12:57:43 -0700 [thread overview]
Message-ID: <20190730125743.113e59a9c449847d7f6ae7c3@linux-foundation.org> (raw)
In-Reply-To: <20190727132334.9184-1-catalin.marinas@arm.com>
On Sat, 27 Jul 2019 14:23:33 +0100 Catalin Marinas <catalin.marinas@arm.com> wrote:
> Add mempool allocations for struct kmemleak_object and
> kmemleak_scan_area as slightly more resilient than kmem_cache_alloc()
> under memory pressure. Additionally, mask out all the gfp flags passed
> to kmemleak other than GFP_KERNEL|GFP_ATOMIC.
>
> A boot-time tuning parameter (kmemleak.mempool) is added to allow a
> different minimum pool size (defaulting to NR_CPUS * 4).
Why would anyone ever want to alter this? Is there some particular
misbehaviour which this will improve? If so, what is it?
> --- a/Documentation/admin-guide/kernel-parameters.txt
> +++ b/Documentation/admin-guide/kernel-parameters.txt
> @@ -2011,6 +2011,12 @@
> Built with CONFIG_DEBUG_KMEMLEAK_DEFAULT_OFF=y,
> the default is off.
>
> + kmemleak.mempool=
> + [KNL] Boot-time tuning of the minimum kmemleak
> + metadata pool size.
> + Format: <int>
> + Default: NR_CPUS * 4
> +
This is the only documentation we provide people and it doesn't really
explain anything at all. IOW, can we do a better job of explaining all this
to the target audience?
Why does the min size need to be tunable anyway?
next prev parent reply other threads:[~2019-07-30 19:57 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-27 13:23 [PATCH v2] mm: kmemleak: Use mempool allocations for kmemleak objects Catalin Marinas
2019-07-30 19:57 ` Andrew Morton [this message]
2019-07-30 20:22 ` Qian Cai
2019-07-30 20:39 ` Andrew Morton
2019-07-31 9:53 ` Catalin Marinas
2019-07-31 12:02 ` Qian Cai
2019-07-31 14:48 ` Catalin Marinas
2019-07-31 14:54 ` Qian Cai
2019-07-31 9:06 ` Michal Hocko
2019-07-31 9:17 ` Catalin Marinas
2019-07-30 20:02 ` Andrew Morton
2019-07-31 15:44 ` Catalin Marinas
2019-08-01 6:41 ` Michal Hocko
2019-08-03 10:48 ` Catalin Marinas
2019-07-31 9:10 ` Michal Hocko
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