Date: Fri, 13 May 2011 18:43:49 +0300 From: Kostik Belousov <kostikbel@gmail.com> To: Attilio Rao <attilio@freebsd.org> Cc: src-committers@freebsd.org, Artem Belevich <art@freebsd.org>, Oleksandr Tymoshenko <gonzo@freebsd.org>, Bruce Evans <brde@optusnet.com.au>, svn-src-projects@freebsd.org, Warner Losh <imp@freebsd.org> Subject: Re: svn commit: r221614 - projects/largeSMP/sys/powerpc/include Message-ID: <20110513154349.GV48734@deviant.kiev.zoral.com.ua> In-Reply-To: <BANLkTinv9=iu8yzJD_ji4D6_txs173Kkxw@mail.gmail.com> References: <BANLkTiktwEvRktZrGOqKKB2iSB99a3Jw=g@mail.gmail.com> <BANLkTik17r-XampEdO%2BsQ7aMOL_SDyhG=g@mail.gmail.com> <BANLkTinaWDcaiZiB3G5Szoaho1jVSeniMA@mail.gmail.com> <BANLkTimj3ohmvACmvcPa3yrdsUj=4D2V3Q@mail.gmail.com> <BANLkTikSgEXZz8vjj7kuyeWQE_oKqzB8ug@mail.gmail.com> <BANLkTinHGpL5tC3-5jOPUq6bJ2Ks7j_Dww@mail.gmail.com> <BANLkTi=DOD9p-YUMm33D5ZShTjS_Q1hEvg@mail.gmail.com> <BANLkTikj%2Bszgd%2BptzD6y%2BofPs%2B8bR7Z8ew@mail.gmail.com> <20110513221936.X1161@besplex.bde.org> <BANLkTinv9=iu8yzJD_ji4D6_txs173Kkxw@mail.gmail.com>
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--xncXys66qXuJqdVV Content-Type: text/plain; charset=us-ascii Content-Disposition: inline On Fri, May 13, 2011 at 03:50:47PM +0200, Attilio Rao wrote: > The per-cpu stuff also, is read only. The pm_active objects are > protected by VM locks. pm_active is not protected by any vm lock. It is set and cleared unlocked in the context switch code. But, the ctx switch only needs to set and clear a single bit at the time of switch, that makes the atomic operations sufficient for consistency. I had a WIP on the Intel PCID, were such protection was not enough, unfortunately. --xncXys66qXuJqdVV Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (FreeBSD) iEYEARECAAYFAk3NUbUACgkQC3+MBN1Mb4gbJwCeKyYAKhfcLfcXxsdJbJ3dcjKe 1WwAnj+xlqdJ/fkHNpf4GFjFqtEAiYa1 =PXrb -----END PGP SIGNATURE----- --xncXys66qXuJqdVV--
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