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

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Message-ID: <1495528968.2174.2.camel@suse.com>
Date:   Tue, 23 May 2017 10:42:48 +0200
From:   Oliver Neukum <oneukum@...e.com>
To:     David Miller <davem@...emloft.net>, jim_baxter@...tor.com
Cc:     bjorn@...k.no, linux-usb@...r.kernel.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [RFC V1 1/1] net: cdc_ncm: Reduce memory use when kernel memory
 low

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)

	Regards
		Oliver