Date: Sat, 20 Oct 2012 19:33:39 -0700 From: Marcel Moolenaar <marcel@xcllnt.net> To: Alan Cox <alc@rice.edu> Cc: Jason Evans <jasone@freebsd.org>, Poul-Henning Kamp <phk@phk.freebsd.dk>, Tim LaBerge <tlaberge@juniper.net>, "freebsd-arch@freebsd.org Arch" <freebsd-arch@freebsd.org> Subject: Re: Behavior of madvise(MADV_FREE) Message-ID: <FC99AD0B-88AA-4D96-BDA8-1B566297B62A@xcllnt.net> In-Reply-To: <508305A6.4090106@rice.edu> References: <9FEBC10C-C453-41BE-8829-34E830585E90@xcllnt.net> <4835.1350062021@critter.freebsd.dk> <E6A52D27-0D6A-4175-9ECA-ADE25BFF35C2@xcllnt.net> <F71ACE9D-297E-4565-BB8D-D95D46D90708@freebsd.org> <F67D539D-8BE3-4817-8466-C76DE43AE252@xcllnt.net> <5082F0F3.1070102@rice.edu> <92742.1350761696@critter.freebsd.dk> <508305A6.4090106@rice.edu>
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On Oct 20, 2012, at 1:12 PM, Alan Cox <alc@rice.edu> wrote: > On 10/20/2012 14:34, Poul-Henning Kamp wrote: >> -------- >> In message<5082F0F3.1070102@rice.edu>, Alan Cox writes: >>=20 >>> I'm sympathetic. Once upon a time, I was often called upon to = explain >>> to network administrators why their idle web cache didn't have = oodles of >>> "free" memory and how this wasn't a problem. >> You too ? :-) >>=20 >>> I think that you're being a bit too pessimistic here. If your use = case >>> really corresponds to "this memory is free and will not be reused = (or >>> reallocated for a very long time)" >> Which brings me to a question I have wondered: Why not simply >> munmap(2) it until you need it again ? >>=20 >=20 > My recollection is that Marcel said that the memory was acquired via = sbrk(2). Correct. --=20 Marcel Moolenaar marcel@xcllnt.net
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