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 13:02:15 -0700 [thread overview]
Message-ID: <20190730130215.919b31c19df935cc5f1483e6@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).
btw, the checkpatch warnings are valid:
WARNING: usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc
#70: FILE: mm/kmemleak.c:197:
+static int min_object_pool = NR_CPUS * 4;
WARNING: usage of NR_CPUS is often wrong - consider using cpu_possible(), num_possible_cpus(), for_each_possible_cpu(), etc
#71: FILE: mm/kmemleak.c:198:
+static int min_scan_area_pool = NR_CPUS * 1;
There can be situations where NR_CPUS is much larger than
num_possible_cpus(). Can we initialize these tunables within
kmemleak_init()?
next prev parent reply other threads:[~2019-07-30 20:02 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
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 [this message]
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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