From: Eric Dumazet <edumazet@google.com>
To: Michal Hocko <mhocko@kernel.org>
Cc: linux-mm@kvack.org, LKML <linux-kernel@vger.kernel.org>
Subject: Re: __GFP_REPEAT usage in fq_alloc_node
Date: Fri, 6 Jan 2017 07:39:14 -0800 [thread overview]
Message-ID: <CANn89i+QZs0cSPK21qMe6LXw+AeAMZ_tKEDUEnCsJ_cd+q0t-g@mail.gmail.com> (raw)
In-Reply-To: <20170106152052.GS5556@dhcp22.suse.cz>
On Fri, Jan 6, 2017 at 7:20 AM, Michal Hocko <mhocko@kernel.org> wrote:
>
> Hi Eric,
> I am currently checking kmalloc with vmalloc fallback users and convert
> them to a new kvmalloc helper [1]. While I am adding a support for
> __GFP_REPEAT to kvmalloc [2] I was wondering what is the reason to use
> __GFP_REPEAT in fq_alloc_node in the first place. c3bd85495aef
> ("pkt_sched: fq: more robust memory allocation") doesn't mention
> anything. Could you clarify this please?
>
> Thanks!
I guess this question applies to all __GFP_REPEAT usages in net/ ?
At the time, tests on the hardware I had in my labs showed that
vmalloc() could deliver pages spread
all over the memory and that was a small penalty (once memory is
fragmented enough, not at boot time)
I guess this wont be anymore a concern if I can finish my pending work
about vmalloc() trying to get adjacent pages
https://lkml.org/lkml/2016/12/21/285
Thanks.
next prev parent reply other threads:[~2017-01-06 15:39 UTC|newest]
Thread overview: 19+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-01-06 15:20 __GFP_REPEAT usage in fq_alloc_node Michal Hocko
2017-01-06 15:39 ` Eric Dumazet [this message]
2017-01-06 16:07 ` Michal Hocko
2017-01-06 16:19 ` Michal Hocko
2017-01-07 3:33 ` [PATCH] net: use kvmalloc rather than open coded variant kbuild test robot
2017-01-07 9:19 ` Michal Hocko
2017-01-07 3:35 ` kbuild test robot
2017-01-09 10:22 ` __GFP_REPEAT usage in fq_alloc_node Michal Hocko
2017-01-09 16:00 ` Eric Dumazet
2017-01-09 17:45 ` Michal Hocko
2017-01-09 17:53 ` Eric Dumazet
2017-01-14 23:43 ` [PATCH] net_sched: use kvmalloc rather than opencoded variant kbuild test robot
2017-01-16 8:54 ` Michal Hocko
2017-01-06 16:31 ` __GFP_REPEAT usage in fq_alloc_node Vlastimil Babka
2017-01-06 16:48 ` Eric Dumazet
2017-01-06 16:50 ` Eric Dumazet
2017-01-06 16:55 ` Vlastimil Babka
2017-01-06 17:08 ` Eric Dumazet
2017-01-06 17:18 ` Vlastimil Babka
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