linux-kernel - Re: [PATCH] fs/select: add vmalloc fallback for select(2)

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Date:   Wed, 28 Sep 2016 22:04:50 +0200
From:   Vlastimil Babka <vbabka@...e.cz>
To:     David Laight <David.Laight@...LAB.COM>,
        Nicholas Piggin <npiggin@...il.com>
Cc:     Jason Baron <jbaron@...mai.com>,
        Hillf Danton <hillf.zj@...baba-inc.com>,
        'Alexander Viro' <viro@...iv.linux.org.uk>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        'Michal Hocko' <mhocko@...nel.org>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>,
        Eric Dumazet <eric.dumazet@...il.com>
Subject: Re: [PATCH] fs/select: add vmalloc fallback for select(2)

On 09/28/2016 06:30 PM, David Laight wrote:
> From: Vlastimil Babka
>> Sent: 27 September 2016 12:51
> ...
>> Process name suggests it's part of db2 database. It seems it has to implement
>> its own interface to select() syscall, because glibc itself seems to have a
>> FD_SETSIZE limit of 1024, which is probably why this wasn't an issue for all the
>> years...
> 
> ISTR the canonical way to increase the size being to set FD_SETSIZE
> to a larger value before including any of the headers.
> 
> Or doesn't that work with linux and glibc ??

Doesn't seem so.

> 
> 	David
>