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Date: Fri, 8 Dec 2017 16:28:46 -0800 (PST)
From: Don Lewis <truckman@FreeBSD.org>
Subject: Re: OOM problem?
To: Larry McVoy <lm@mcvoy.com>
cc: Konstantin Belousov <kostikbel@gmail.com>, freebsd-hackers@freebsd.org
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References: <20171208011430.GA16016@mcvoy.com>
 <20171208101543.GC2272@kib.kiev.ua> <20171208150121.GH16028@mcvoy.com>
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On  8 Dec, Larry McVoy wrote:
> On Fri, Dec 08, 2017 at 12:15:43PM +0200, Konstantin Belousov wrote:

>> A process waiting for a page in the fault handler must receive the page
>> to get out of the handler, even if the system is in OOM.  
> 
> I may be confusing you because this is not the normal page fault on a file
> code path (at least I think it is not).  The process is indeed faulting
> in pages but they are pages that were allocated via whatever malloc calls
> these days (in SunOS it mmapped /dev/zero, before that it was sbrk(2),
> I dunno what FreeBSD does, I couldn't find malloc in src/lib, I see that
> it's jemalloc but /usr/src/lib/libc/stdlib/jemalloc has no files?)

/usr/src/contrib/jemalloc