Date: Mon, 9 Jul 2018 10:32:47 +0300 From: Andriy Gapon <avg@FreeBSD.org> To: Pratyush Yadav <pratyush@freebsd.org>, freebsd-hackers@freebsd.org Subject: Re: Can contigmalloc(9) fail even when M_NOWAIT is *not* specified? Message-ID: <77cc8c09-41e1-cbdf-7c79-90af75ee3cd9@FreeBSD.org> In-Reply-To: <CA%2BX=3T%2BBbcfY1BFGze=scxXFNPkh7Pn-Qx1kKGURi00adHCquw@mail.gmail.com> References: <CA%2BX=3T%2BBbcfY1BFGze=scxXFNPkh7Pn-Qx1kKGURi00adHCquw@mail.gmail.com>
next in thread | previous in thread | raw e-mail | index | archive | help
On 09/07/2018 09:21, Pratyush Yadav wrote: > Hi, > > The contigmalloc(9) man page says: > >> The contigmalloc() function does not sleep waiting for memory resources >> to be freed up, but instead actively reclaims pages before giving up. >> However, unless M_NOWAIT is specified, it may select a page for reclama- >> tion that must first be written to backing storage, causing it to sleep. > > So if M_NOWAIT is *not* specified, can contigmalloc() "give up", and > return NULL? Yes. -- Andriy Gapon
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?77cc8c09-41e1-cbdf-7c79-90af75ee3cd9>