Date: Mon, 30 Dec 2013 22:21:58 -0500 From: Pedro Giffuni <pfg@FreeBSD.org> To: Mark Johnston <markj@freebsd.org> Cc: svn-src-head@freebsd.org, svn-src-all@freebsd.org, Gleb Smirnoff <glebius@FreeBSD.org>, Mike Ma <mikemandarine@gmail.com>, src-committers@freebsd.org Subject: Re: svn commit: r260091 - in head/sys/cddl: contrib/opensolaris/uts/common/dtrace contrib/opensolaris/uts/common/sys dev/dtrace Message-ID: <7A335B4A-D986-4E6E-8D8B-22E7E7991A75@FreeBSD.org> In-Reply-To: <20131231023952.GA11997@charmander.home> References: <201312301737.rBUHbW3I035088@svn.freebsd.org> <20131230204210.GD71033@FreeBSD.org> <20131231023952.GA11997@charmander.home>
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Il giorno 30/dic/2013, alle ore 21:40, Mark Johnston <markj@freebsd.org> ha scritto: > On Tue, Dec 31, 2013 at 12:42:10AM +0400, Gleb Smirnoff wrote: >> On Mon, Dec 30, 2013 at 05:37:32PM +0000, Mark Johnston wrote: >> M> Author: markj >> M> Date: Mon Dec 30 17:37:32 2013 >> M> New Revision: 260091 >> M> URL: http://svnweb.freebsd.org/changeset/base/260091 >> M> >> M> Log: >> M> Now that vmem(9) is available, use vmem arenas to allocate probe and >> M> aggregation IDs, as is done in the upstream illumos code. This still >> M> requires some FreeBSD-specific code, as our vmem API is not identical to the >> M> one in illumos. >> M> >> M> Submitted by: Mike Ma <mikemandarine@gmail.com> >> >> IMHO, alloc_unr() was lighter and thus better for allocating just IDs. > > That's true; I committed the change since it helps keep our code similar > to upstream and, as Pedro notes, it was a long-standing todo item on the > wiki. After doing some testing, it looks like vmem is a bit slower: > process startup is on the order of tenths of milliseconds longer with > this change, for executables containing one USDT probe (since such > probes are allocated during process startup). > > So probably the right thing to do is revert this change. It doesn't > actually reduce the upstream diff as much as I'd hoped, anyway. > Since it is our option to decide, perhaps just keep the vmem version as reference and #ifdef FreeBSD alloc_unr() ? I don’t think we need to keep most of those SUN defines anymore. Pedro. > Thanks, > -Mark
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