Re: [patch 1/6] procfs: Introduce sequential fdinfo engine

From: Cyrill Gorcunov
Date: Thu Oct 31 2013 - 06:58:00 EST

On Thu, Oct 31, 2013 at 01:32:13PM +0300, Alexey Dobriyan wrote:
> On Wed, Oct 30, 2013 at 10:59 PM, Cyrill Gorcunov <gorcunov@xxxxxxxxxx> wrote:
> > At moment the fdinfo operations (ie the output from /proc/$pid/fdinfo/$fd)
> > are generating output in one pass, which makes useless memory pressue
> > if the reader/user provides a buffer with a small size.
> cat(1) uses 64 KB buffer.
> The output doesn't exceed one page anyway.

Yes, good point. I probably need to update changelog (forgot that i'm using
single_open here). What if we meet a file with that big number of epoll
or say notifies assigned that the fdinfo won't fit a page? I didn't meet
such scenario yet, but I think it's possible?
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