Date: Thu, 10 Jan 2008 15:31:32 +0100 From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no> To: Peter Schuller <peter.schuller@infidyne.com> Cc: Andrew Reilly <andrew-freebsd@areilly.bpc-users.org>, Peter Jeremy <peterjeremy@optushome.com.au>, Poul-Henning Kamp <phk@phk.freebsd.dk>, freebsd-current@freebsd.org, Igor Mozolevsky <igor@hybrid-lab.co.uk>, Kostik Belousov <kostikbel@gmail.com> Subject: Re: sbrk(2) broken Message-ID: <86prw9hhvf.fsf@ds4.des.no> In-Reply-To: <863at6j8tr.fsf@ds4.des.no> ("Dag-Erling =?utf-8?Q?Sm=C3=B8rg?= =?utf-8?Q?rav=22's?= message of "Thu\, 10 Jan 2008 11\:04\:00 %2B0100") References: <15094.1199751424@critter.freebsd.dk> <200801080237.40379.peter.schuller@infidyne.com> <86tzlonozc.fsf@ds4.des.no> <200801091922.56670.peter.schuller@infidyne.com> <863at6j8tr.fsf@ds4.des.no>
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Dag-Erling Smørgrav <des@des.no> writes: > Peter Schuller <peter.schuller@infidyne.com> writes: > > However, in this context it will likely only help partially since you still > > need a full page to be free (and with a lot of programs many allocations will > > be significantly smaller than that, and I have to assume no real-life malloc > > will align all allocations to pages, or the overhead would be extreme). > Page-aligning every allocation would be supremely stupid, and jemalloc > does so only for allocations larger than a page. I misread your "no" as "any", so it seems we are in violent agreement. However, most allocators these days are zone or slab allocators (or similar in principle), and are pretty good at minimizing external fragmentation except for pathological cases, which are suprisingly rare in practice. DES -- Dag-Erling Smørgrav - des@des.no
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