From: Jesper Dangaard Brouer <brouer@redhat.com>
To: Mel Gorman <mgorman@techsingularity.net>
Cc: Chuck Lever <chuck.lever@oracle.com>,
Mel Gorman <mgorman@suse.de>,
Linux NFS Mailing List <linux-nfs@vger.kernel.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
Jakub Kicinski <kuba@kernel.org>,
brouer@redhat.com
Subject: Re: alloc_pages_bulk()
Date: Mon, 15 Feb 2021 17:10:38 +0100 [thread overview]
Message-ID: <20210215171038.42f62438@carbon> (raw)
In-Reply-To: <20210215120056.GD3697@techsingularity.net>
On Mon, 15 Feb 2021 12:00:56 +0000
Mel Gorman <mgorman@techsingularity.net> wrote:
> On Thu, Feb 11, 2021 at 01:26:28PM +0100, Jesper Dangaard Brouer wrote:
[...]
>
> > I also suggest the API can return less pages than requested. Because I
> > want to to "exit"/return if it need to go into an expensive code path
> > (like buddy allocator or compaction). I'm assuming we have a flags to
> > give us this behavior (via gfp_flags or alloc_flags)?
> >
>
> The API returns the number of pages returned on a list so policies
> around how aggressive it should be allocating the requested number of
> pages could be adjusted without changing the API. Passing in policy
> requests via gfp_flags may be problematic as most (all?) bits are
> already used.
Well, I was just thinking that I would use GFP_ATOMIC instead of
GFP_KERNEL to "communicate" that I don't want this call to take too
long (like sleeping). I'm not requesting any fancy policy :-)
For page_pool use case we use (GFP_ATOMIC | __GFP_NOWARN) flags.
static inline struct page *page_pool_dev_alloc_pages(struct page_pool *pool)
{
gfp_t gfp = (GFP_ATOMIC | __GFP_NOWARN);
return page_pool_alloc_pages(pool, gfp);
}
--
Best regards,
Jesper Dangaard Brouer
MSc.CS, Principal Kernel Engineer at Red Hat
LinkedIn: http://www.linkedin.com/in/brouer
next prev parent reply other threads:[~2021-02-15 16:10 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <2A0C36E7-8CB0-486F-A8DB-463CA28C5C5D@oracle.com>
2021-02-08 17:50 ` Fwd: alloc_pages_bulk() Chuck Lever
2021-02-09 10:31 ` alloc_pages_bulk() Jesper Dangaard Brouer
2021-02-09 13:37 ` alloc_pages_bulk() Chuck Lever
2021-02-09 17:27 ` alloc_pages_bulk() Vlastimil Babka
2021-02-10 9:51 ` alloc_pages_bulk() Christoph Hellwig
2021-02-10 8:41 ` alloc_pages_bulk() Mel Gorman
2021-02-10 11:41 ` alloc_pages_bulk() Jesper Dangaard Brouer
2021-02-10 13:07 ` alloc_pages_bulk() Mel Gorman
2021-02-10 22:58 ` alloc_pages_bulk() Chuck Lever
2021-02-11 9:12 ` alloc_pages_bulk() Mel Gorman
2021-02-11 12:26 ` alloc_pages_bulk() Jesper Dangaard Brouer
2021-02-15 12:00 ` alloc_pages_bulk() Mel Gorman
2021-02-15 16:10 ` Jesper Dangaard Brouer [this message]
2021-02-22 9:42 ` alloc_pages_bulk() Mel Gorman
2021-02-22 11:42 ` alloc_pages_bulk() Jesper Dangaard Brouer
2021-02-22 14:08 ` alloc_pages_bulk() Mel Gorman
2021-02-11 16:20 ` alloc_pages_bulk() Chuck Lever
2021-02-15 12:06 ` alloc_pages_bulk() Mel Gorman
2021-02-15 16:00 ` alloc_pages_bulk() Chuck Lever
2021-02-22 20:44 ` alloc_pages_bulk() Jesper Dangaard Brouer
2021-02-09 22:01 ` Fwd: alloc_pages_bulk() Matthew Wilcox
2021-02-09 22:55 ` alloc_pages_bulk() Chuck Lever
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