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From: Roger Pau Monne <roger.pau@citrix.com>
To: <xen-devel@lists.xenproject.org>
Cc: Stefano Stabellini <sstabellini@kernel.org>,
	Julien Grall <julien@xen.org>, Wei Liu <wl@xen.org>,
	Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>,
	George Dunlap <George.Dunlap@eu.citrix.com>,
	Andrew Cooper <andrew.cooper3@citrix.com>,
	Ian Jackson <ian.jackson@eu.citrix.com>,
	Jan Beulich <jbeulich@suse.com>,
	Roger Pau Monne <roger.pau@citrix.com>
Subject: [Xen-devel] [PATCH 0/2] smp: convert cpu_add_remove_lock int a rw lock
Date: Thu, 13 Feb 2020 12:32:35 +0100	[thread overview]
Message-ID: <20200213113237.58795-1-roger.pau@citrix.com> (raw)

Hello,

The main aim of this series is to reduce the pressure around
cpu_add_remove_lock by converting it into a rw lock. Most users of the
lock want to take it in read mode, as they only care about the maps not
changing.

Patch #2 makes the writers take the lock in blocking mode, this is
mainly done to reduce the failure of the CPU plug/unplug operations,
since the lock is more contended now and trylock can easily fail if
there are readers.

Thanks, Roger.

Roger Pau Monne (2):
  smp: convert the cpu maps lock into a rw lock
  smp: convert cpu_hotplug_begin into a blocking lock acquisition

 xen/arch/x86/smpboot.c |  3 +--
 xen/common/cpu.c       | 29 ++++++++++++++++++-----------
 xen/include/xen/cpu.h  | 13 +++----------
 3 files changed, 22 insertions(+), 23 deletions(-)

-- 
2.25.0


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             reply	other threads:[~2020-02-13 11:33 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-02-13 11:32 Roger Pau Monne [this message]
2020-02-13 11:32 ` [Xen-devel] [PATCH 1/2] smp: convert the cpu maps lock into a rw lock Roger Pau Monne
2020-02-19 12:08   ` Julien Grall
2020-02-19 12:56   ` Jan Beulich
2020-02-19 13:19     ` Roger Pau Monné
2020-02-19 13:42       ` Jan Beulich
2020-02-19 14:38         ` Roger Pau Monné
2020-02-20  8:13   ` Jan Beulich
2020-02-20  8:27     ` Jürgen Groß
2020-02-20  8:36       ` Jan Beulich
2020-02-20  8:57         ` Julien Grall
2020-02-20  9:20           ` Roger Pau Monné
2020-02-13 11:32 ` [Xen-devel] [PATCH 2/2] smp: convert cpu_hotplug_begin into a blocking lock acquisition Roger Pau Monne
2020-02-19 12:59   ` Jan Beulich
2020-02-19 13:22     ` Roger Pau Monné
2020-02-19 13:44       ` Jan Beulich
2020-02-19 14:45         ` Roger Pau Monné
2020-02-19 14:57           ` Jan Beulich
2020-02-19 15:07             ` Andrew Cooper
2020-02-19 16:06               ` Jan Beulich
2020-02-19 16:26                 ` Roger Pau Monné
2020-02-19 17:06                   ` Jan Beulich
2020-02-19 16:54                 ` Andrew Cooper
2020-02-19 16:08               ` Roger Pau Monné
2020-02-19 17:03                 ` Jan Beulich
2020-02-20  8:16                   ` Jan Beulich
2020-02-21 10:23                     ` Roger Pau Monné
2020-02-21 13:06                       ` Jan Beulich
2020-02-19 14:58         ` Andrew Cooper
2020-02-19 12:22 ` [Xen-devel] [PATCH 0/2] smp: convert cpu_add_remove_lock int a rw lock Andrew Cooper

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