Date: Tue, 24 Jan 2017 15:14:28 +0200 From: Konstantin Belousov <kostikbel@gmail.com> To: Alexander Motin <mav@FreeBSD.org> Cc: src-committers@freebsd.org, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r312694 - in head: sys/cam/ctl usr.sbin/ctladm Message-ID: <20170124131427.GK2349@kib.kiev.ua> In-Reply-To: <201701241213.v0OCDfpa096425@repo.freebsd.org> References: <201701241213.v0OCDfpa096425@repo.freebsd.org>
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On Tue, Jan 24, 2017 at 12:13:41PM +0000, Alexander Motin wrote: > Author: mav > Date: Tue Jan 24 12:13:41 2017 > New Revision: 312694 > URL: https://svnweb.freebsd.org/changeset/base/312694 > > Log: > Make CTL ramdisk backend a real RAM disk. > > If "capacity" LU option is set, ramdisk backend now implements featured > thin provisioned disk, storing data in malloc(9) allocated memory blocks > of pblocksize bytes (default PAGE_SIZE or 4KB). Additionally ~0.2% of LU > size is used for indirection tree (bigger pblocksize reduce the overhead). > Backend supports all unmap and anchor operations. If configured capacity > is overflowed, proper error conditions are reported. > > If "capacity" LU option is not set, the backend operates mostly the same > as before without allocating real storage: writes go to nowhere, reads > return zeroes, reporting that all LBAs are unmapped. > > This backend is still mostly oriented on testing and benchmarking (it is > still a volatile RAM disk), but now it should allow to run real FS tests, > not only simple dumb dd. This sounds too much like malloc-backed md(4).
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