Date: Sat, 13 Oct 2018 14:52:47 +0100 From: RW <rwmaillists@googlemail.com> To: freebsd-questions@freebsd.org Subject: Re: swap to a sparse file Message-ID: <20181013145247.0a4b7f05@gumby.homeunix.com> In-Reply-To: <20181013081118.9e8632405e555c3bf2f9a722@sohara.org> References: <20181011014705.GA17798@admin.sibptus.ru> <20181011085114.bfcdb701b3644728a71eaa38@sohara.org> <20181012193633.7dc32f86@gumby.homeunix.com> <20181013081118.9e8632405e555c3bf2f9a722@sohara.org>
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On Sat, 13 Oct 2018 08:11:18 +0100 Steve O'Hara-Smith wrote: > On Fri, 12 Oct 2018 19:36:33 +0100 > RW via freebsd-questions <freebsd-questions@freebsd.org> wrote: > > > On Thu, 11 Oct 2018 08:51:14 +0100 > > Steve O'Hara-Smith wrote: > > > > > On Thu, 11 Oct 2018 08:47:05 +0700 > > > Victor Sudakov <vas@mpeks.tomsk.su> wrote: > > > > > > > Is there any good reason I can't just "truncate -s2G /swap0" and > > > > make the swap a sparse file? > > > > > > Just one - if the space isn't there when the system needs > > > it there will be a panic. > > > > Is that really the only reason? I've not paid much attention, but > > the warnings I've heard about this have made it sound a lot worse. > > There's not much worse the system can do than panic, other > than deadlock which might happen if memory needs to be allocated in > order to add blocks to the file. IIRC swap on a zvol can deadlock > that way. Yes, but filling up a drive is relatively avoidable - particularly if there's space reserved for root.
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