linux-kernel - Re: [PATCH 5/6] treewide: use kv[mz]alloc* rather than opencoded variants

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Date:   Fri, 13 Jan 2017 01:11:51 +0000
From:   "Dilger, Andreas" <andreas.dilger@...el.com>
To:     Michal Hocko <mhocko@...nel.org>
CC:     Andrew Morton <akpm@...ux-foundation.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        David Rientjes <rientjes@...gle.com>,
        Mel Gorman <mgorman@...e.de>,
        Johannes Weiner <hannes@...xchg.org>,
        Al Viro <viro@...iv.linux.org.uk>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Michal Hocko <mhocko@...e.com>,
        "Martin Schwidefsky" <schwidefsky@...ibm.com>,
        Heiko Carstens <heiko.carstens@...ibm.com>,
        Herbert Xu <herbert@...dor.apana.org.au>,
        Anton Vorontsov <anton@...msg.org>,
        Colin Cross <ccross@...roid.com>,
        "Kees Cook" <keescook@...omium.org>,
        "Luck, Tony" <tony.luck@...el.com>,
        "Rafael J. Wysocki" <rjw@...ysocki.net>,
        Ben Skeggs <bskeggs@...hat.com>,
        "Kent Overstreet" <kent.overstreet@...il.com>,
        Santosh Raspatur <santosh@...lsio.com>,
        Hariprasad S <hariprasad@...lsio.com>,
        Tariq Toukan <tariqt@...lanox.com>,
        Yishai Hadas <yishaih@...lanox.com>,
        "Williams, Dan J" <dan.j.williams@...el.com>,
        "Drokin, Oleg" <oleg.drokin@...el.com>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
        David Sterba <dsterba@...e.com>,
        "Yan, Zheng" <zyan@...hat.com>, Ilya Dryomov <idryomov@...il.com>,
        "Alexei Starovoitov" <ast@...nel.org>,
        Eric Dumazet <eric.dumazet@...il.com>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH 5/6] treewide: use kv[mz]alloc* rather than opencoded
 variants


> On Jan 12, 2017, at 08:37, Michal Hocko <mhocko@...nel.org> wrote:
> 
> From: Michal Hocko <mhocko@...e.com>
> 
> There are many code paths opencoding kvmalloc. Let's use the helper
> instead. The main difference to kvmalloc is that those users are usually
> not considering all the aspects of the memory allocator. E.g. allocation
> requests < 64kB are basically never failing and invoke OOM killer to
> satisfy the allocation. This sounds too disruptive for something that
> has a reasonable fallback - the vmalloc. On the other hand those
> requests might fallback to vmalloc even when the memory allocator would
> succeed after several more reclaim/compaction attempts previously. There
> is no guarantee something like that happens though.
> 
> This patch converts many of those places to kv[mz]alloc* helpers because
> they are more conservative.
> 
> Signed-off-by: Michal Hocko <mhocko@...e.com>

Lustre part can be
Acked-by: Andreas Dilger <andreas.dilger@...el.com>

[snip]

> diff --git a/drivers/staging/lustre/lnet/libcfs/linux/linux-mem.c b/drivers/staging/lustre/lnet/libcfs/linux/linux-mem.c
> index a6a76a681ea9..8f638267e704 100644
> --- a/drivers/staging/lustre/lnet/libcfs/linux/linux-mem.c
> +++ b/drivers/staging/lustre/lnet/libcfs/linux/linux-mem.c
> @@ -45,15 +45,6 @@ EXPORT_SYMBOL(libcfs_kvzalloc);
> void *libcfs_kvzalloc_cpt(struct cfs_cpt_table *cptab, int cpt, size_t size,
> 			  gfp_t flags)
> {
> -	void *ret;
> -
> -	ret = kzalloc_node(size, flags | __GFP_NOWARN,
> -			   cfs_cpt_spread_node(cptab, cpt));
> -	if (!ret) {
> -		WARN_ON(!(flags & (__GFP_FS | __GFP_HIGH)));
> -		ret = vmalloc_node(size, cfs_cpt_spread_node(cptab, cpt));
> -	}
> -
> -	return ret;
> +	return kvzalloc_node(size, flags, cfs_cpt_spread_node(cptab, cpt));
> }
> EXPORT_SYMBOL(libcfs_kvzalloc_cpt);