From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Date: Wed, 27 Jan 2021 23:15:05 +0100 From: Pavel Machek Subject: Re: [PATCH v4 1/2] drivers/misc: sysgenid: add system generation id driver Message-ID: <20210127221505.GB24799@amd> References: <1610453760-13812-1-git-send-email-acatan@amazon.com> <1610453760-13812-2-git-send-email-acatan@amazon.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="qlTNgmc+xy1dBmNv" Content-Disposition: inline In-Reply-To: <1610453760-13812-2-git-send-email-acatan@amazon.com> List-ID: To: Adrian Catangiu Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, qemu-devel@nongnu.org, kvm@vger.kernel.org, linux-s390@vger.kernel.org, gregkh@linuxfoundation.org, graf@amazon.com, arnd@arndb.de, ebiederm@xmission.com, rppt@kernel.org, 0x7f454c46@gmail.com, borntraeger@de.ibm.com, Jason@zx2c4.com, jannh@google.com, w@1wt.eu, colmmacc@amazon.com, luto@kernel.org, tytso@mit.edu, ebiggers@kernel.org, dwmw@amazon.co.uk, bonzini@gnu.org, sblbir@amazon.com, raduweis@amazon.com, corbet@lwn.net, mst@redhat.com, mhocko@kernel.org, rafael@kernel.org, mpe@ellerman.id.au, areber@redhat.com, ovzxemul@gmail.com, avagin@gmail.com, ptikhomirov@virtuozzo.com, gil@azul.com, asmehra@redhat.com, dgunigun@redhat.com, vijaysun@ca.ibm.com, oridgar@gmail.com, ghammer@redhat.com --qlTNgmc+xy1dBmNv Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Hi! > - Solution >=20 > The System Generation ID is a simple concept meant to alleviate the > issue by providing a monotonically increasing u32 counter that changes > each time the VM or container is restored from a snapshot. I'd make it u64. But as people explained, this has race problems that may be impossible to solve? Best regards, Pavel =09 --=20 http://www.livejournal.com/~pavelmachek --qlTNgmc+xy1dBmNv Content-Type: application/pgp-signature; name="signature.asc" Content-Description: Digital signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1 iEYEARECAAYFAmAR5ekACgkQMOfwapXb+vIeRACdFFlEw9Qzjgj/nAuNJzxFeb2z 28wAoKXL22jBt2ohyVp9BgmFr64wldNZ =T3KQ -----END PGP SIGNATURE----- --qlTNgmc+xy1dBmNv--