Date: Wed, 16 May 2018 22:19:43 -0400 From: "Jonathan T. Looney" <jtl@freebsd.org> To: Matt Macy <mmacy@freebsd.org> Cc: src-committers <src-committers@freebsd.org>, svn-src-all@freebsd.org, svn-src-head@freebsd.org Subject: Re: svn commit: r333690 - in head/sys: dev/hwpmc kern sys Message-ID: <CADrOrmu03Ntm0=y_ZOdS6M=gP0M_ZRc0vrMgBW69hxQVq6sAKA@mail.gmail.com> In-Reply-To: <201805162229.w4GMTKJj070790@repo.freebsd.org> References: <201805162229.w4GMTKJj070790@repo.freebsd.org>
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On Wed, May 16, 2018 at 6:29 PM, Matt Macy <mmacy@freebsd.org> wrote: > > Author: mmacy > Date: Wed May 16 22:29:20 2018 > New Revision: 333690 > URL: https://svnweb.freebsd.org/changeset/base/333690 > > Log: > hwpmc: Implement per-thread counters for PMC sampling > > This implements per-thread counters for PMC sampling. The thread > descriptors are stored in a list attached to the process descriptor. > These thread descriptors can store any per-thread information necessary > for current or future features. For the moment, they just store the counters > for sampling. > > The thread descriptors are created when the process descriptor is created. > Additionally, thread descriptors are created or freed when threads > are started or stopped. Because the thread exit function is called in a > critical section, we can't directly free the thread descriptors. Hence, > they are freed to a cache, which is also used as a source of allocations > when needed for new threads. > > Approved by: sbruno > Obtained from: jtl > Sponsored by: Juniper Networks, Limelight Networks > Differential Revision: https://reviews.freebsd.org/D15335 Thanks! Jonathan
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