Date: Wed, 24 Jan 2018 08:43:16 +0100 From: Karsten Koenig <mail@kkoenig.net> To: freebsd-questions@freebsd.org Subject: Re: Question about 'anonymous' UMA zones Message-ID: <55907e70-edda-70d2-a1de-038190e3762b@kkoenig.net> In-Reply-To: <mailman.73.1516622403.82088.freebsd-questions@freebsd.org> References: <mailman.73.1516622403.82088.freebsd-questions@freebsd.org>
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Hello y'all, it seems I could answer this myself. The root cause is that I compiled my kernel with DEBUG_REDZONE for testing. I don't quite understand why this happens for the lower zones, yet, but I guess I just have to read the redzone code again. Best, Karsten On 22.01.2018 13:00, freebsd-questions-request@freebsd.org wrote: Hello y'all, I just played a little bit with the zone allocator of the FreeBSD kernel and observed the following: All 'anonymous' zones (is this the appropriate term?) with a size smaller than 512 Bytes have no slabs: # vmstat -z ITEM SIZE LIMIT USED FREE REQ FAIL SLEEP ... 16: 16, 0, 0, 0, 0, 0, 0 32: 32, 0, 0, 0, 0, 0, 0 64: 64, 0, 0, 0, 0, 0, 0 128: 128, 0, 0, 0, 0, 0, 0 256: 256, 0, 0, 0, 0, 0, 0 512: 512, 0, 7906, 70, 97681, 0, 0 ... I would like to know why this is the case; can someone explain this to me? What happens if I allocate e.g. a 256 Byte buffer? Best, Karsten
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