[dm-devel] [PATCH] md/dm-ioctl.c: optimize memory allocation in copy_params
Alasdair G Kergon
agk at redhat.com
Tue Jul 22 02:04:58 UTC 2014
On Tue, Jul 22, 2014 at 02:23:52AM +0100, Alasdair G Kergon wrote:
> Unanswered. Let's ask the same question in a different way:
A quick search for 'vold' returns:
and the code there requests a fixed 64K allocation to hold the names of
So unlike libdevmapper-based applications where a smaller allocation is
used at first and only extended if needed, Android just assumes that
64KB is enough for everyone.
So is your claim that:
1. This 64KB allocation for the brief duration of the ioctl to store the
names of active device-mapper volumes leads to memory problems?
[Mustn't the system *already* be in a bad state if this pushes it over
2. The systems on which this memory shortage occurs have so many volumes
(with long names?) that a smaller allocation would not suffice?
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