Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory low

From	David Miller <davem@davemloft.net>
Newsgroups	linux.kernel
Subject	Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory low
Date	2017-05-23 17:30 +0200
Message-ID	<tKjV0-51B-7@gated-at.bofh.it> (permalink)
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From: Oliver Neukum <oneukum@suse.com>
Date: Tue, 23 May 2017 10:42:48 +0200

> Am Montag, den 22.05.2017, 11:54 -0400 schrieb David Miller:
>> 
>> Unfortunately without a real notifier of some sort (there isn't one, and
>> it isn't actually easy to come up with a clean way to do this which is
>> probably why it doesn't exist yet in the first place) I really cannot
>> recommend anything better.
>> 
>> That being said, probably for the time being we should just backoff each
>> and every request, always trying initially to do the higher order thing.
> 
> We could use a counter. After the first failure, do it once, after the
> second twice and so on. And reset the counter as a higher order
> allocation works. (just bound it somewhere)

So an exponential backoff, that might work.

Thread

[RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory low Jim Baxter <jim_baxter@mentor.com> - 2017-05-16 19:50 +0200
  Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory low Bjørn Mork <bjorn@mork.no> - 2017-05-16 20:30 +0200
    Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory  low Oliver Neukum <oneukum@suse.com> - 2017-05-17 09:50 +0200
      Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory  low "Baxter, Jim" <jim_baxter@mentor.com> - 2017-05-17 13:00 +0200
    Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel  memory low David Miller <davem@davemloft.net> - 2017-05-17 20:20 +0200
      Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory  low Oliver Neukum <oneukum@suse.com> - 2017-05-18 12:10 +0200
      Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory  low "Baxter, Jim" <jim_baxter@mentor.com> - 2017-05-22 17:50 +0200
        Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel  memory low David Miller <davem@davemloft.net> - 2017-05-22 18:00 +0200
          Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory  low Oliver Neukum <oneukum@suse.com> - 2017-05-23 10:50 +0200
            Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel  memory low David Miller <davem@davemloft.net> - 2017-05-23 17:30 +0200
              Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory  low "Baxter, Jim" <jim_baxter@mentor.com> - 2017-05-23 21:10 +0200
  RE: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory  low David Laight <David.Laight@ACULAB.COM> - 2017-05-19 13:20 +0200
    Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory low Bjørn Mork <bjorn@mork.no> - 2017-05-19 16:00 +0200
      RE: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory  low David Laight <David.Laight@ACULAB.COM> - 2017-05-19 16:50 +0200
        Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory  low Oliver Neukum <oneukum@suse.com> - 2017-05-22 15:30 +0200

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