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

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Message-ID: <063D6719AE5E284EB5DD2968C1650D6DB010AAC6@AcuExch.aculab.com>
Date:   Wed, 28 Sep 2016 16:30:16 +0000
From:   David Laight <David.Laight@...LAB.COM>
To:     'Vlastimil Babka' <vbabka@...e.cz>,
        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)

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 ??

	David