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From: Davidlohr Bueso <dave@stgolabs.net>
To: NeilBrown <neilb@suse.com>
Cc: akpm@linux-foundation.org, torvalds@linux-foundation.org,
	tgraf@suug.ch, herbert@gondor.apana.org.au,
	manfred@colorfullife.com, mhocko@kernel.org,
	guillaume.knispel@supersonicimagine.com,
	linux-api@vger.kernel.org, linux-kernel@vger.kernel.org,
	Davidlohr Bueso <dbueso@suse.de>
Subject: Re: [PATCH 1/4] lib/rhashtable: simplify bucket_table_alloc()
Date: Thu, 21 Jun 2018 23:36:13 -0700	[thread overview]
Message-ID: <20180622063613.kcnkrfpyszphnf46@linux-r8p5> (raw)
In-Reply-To: <87sh5fbbma.fsf@notabene.neil.brown.name>

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On Fri, 22 Jun 2018, NeilBrown wrote:

>On Thu, Jun 21 2018, Davidlohr Bueso wrote:
>
>> As of ce91f6ee5 (mm: kvmalloc does not fallback to vmalloc for incompatible gfp flag),
>> we can simplify the caller and trust kvzalloc() to just do the right thing.
>
>Hi,
> it isn't clear to me that this is true.
> With this change we lose __GFP_NOWARN and __GFP_NORETRY.
> I doubt the NORETRY is particularly important as this is if it
> isn't GFP_KERNEL, then it is GFP_ATOMIC which doesn't retry anyway.
> However I cannot see why this patch won't result in warnings when the
> kzalloc() fails.
> What am I missing?

You're right, it might be too agressive to get rid of the GFP_NOWARN for
the callers that do GFP_ATOMIC.

I'll send a new version of this patch along with a better changelog.

Thanks,
Davidlohr

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  reply	other threads:[~2018-06-22  6:36 UTC|newest]

Thread overview: 14+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2018-06-21 21:28 [PATCH -next v3 0/4] rhashtable: guarantee initial allocation Davidlohr Bueso
2018-06-21 21:28 ` [PATCH 1/4] lib/rhashtable: simplify bucket_table_alloc() Davidlohr Bueso
2018-06-21 21:33   ` Randy Dunlap
2018-06-22  6:04   ` NeilBrown
2018-06-22  6:04     ` NeilBrown
2018-06-22  6:36     ` Davidlohr Bueso [this message]
2018-06-22 18:15   ` [PATCH v2 " Davidlohr Bueso
2018-06-22 18:16     ` Davidlohr Bueso
2018-06-22 18:35     ` Davidlohr Bueso
2018-06-25  9:13     ` Michal Hocko
2018-06-21 21:28 ` [PATCH 2/4] lib/rhashtable: guarantee initial hashtable allocation Davidlohr Bueso
2018-06-22  6:54   ` Herbert Xu
2018-06-21 21:28 ` [PATCH 3/4] ipc: get rid of ids->tables_initialized hack Davidlohr Bueso
2018-06-21 21:28 ` [PATCH 4/4] ipc: simplify ipc initialization Davidlohr Bueso

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