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Mon, 29 Jun 2020 18:38:20 +0000 (UTC) X-HE-Tag: steel70_0a123db26e71 X-Filterd-Recvd-Size: 4640 Received: from hqnvemgate26.nvidia.com (hqnvemgate26.nvidia.com [216.228.121.65]) by imf17.hostedemail.com (Postfix) with ESMTP for ; Mon, 29 Jun 2020 18:38:19 +0000 (UTC) Received: from hqpgpgate101.nvidia.com (Not Verified[216.228.121.13]) by hqnvemgate26.nvidia.com (using TLS: TLSv1.2, DES-CBC3-SHA) id ; Mon, 29 Jun 2020 11:38:06 -0700 Received: from hqmail.nvidia.com ([172.20.161.6]) by hqpgpgate101.nvidia.com (PGP Universal service); Mon, 29 Jun 2020 11:38:18 -0700 X-PGP-Universal: processed; by hqpgpgate101.nvidia.com on Mon, 29 Jun 2020 11:38:18 -0700 Received: from [10.2.167.170] (10.124.1.5) by HQMAIL107.nvidia.com (172.20.187.13) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Mon, 29 Jun 2020 18:38:17 +0000 From: Zi Yan To: Matthew Wilcox CC: , Andrew Morton Subject: Re: [PATCH 2/2] mm: Simplify PageDoubleMap with PF_SECOND policy Date: Mon, 29 Jun 2020 14:38:14 -0400 X-Mailer: MailMate (1.13.1r5690) Message-ID: In-Reply-To: <20200629151933.15671-3-willy@infradead.org> References: <20200629151933.15671-1-willy@infradead.org> <20200629151933.15671-3-willy@infradead.org> MIME-Version: 1.0 X-Originating-IP: [10.124.1.5] X-ClientProxiedBy: HQMAIL105.nvidia.com (172.20.187.12) To HQMAIL107.nvidia.com (172.20.187.13) Content-Type: multipart/signed; boundary="=_MailMate_427835FB-543A-47DF-986F-D3245B801990_="; micalg=pgp-sha512; protocol="application/pgp-signature" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=nvidia.com; s=n1; t=1593455886; bh=NW+VbNRYSGWdJsIDXeugH5S2v1vNkHYAuKrzo+G6Dso=; h=X-PGP-Universal:From:To:CC:Subject:Date:X-Mailer:Message-ID: In-Reply-To:References:MIME-Version:X-Originating-IP: X-ClientProxiedBy:Content-Type; b=kXwyeCUScKTI0WtS0iMCyD/DD2f7DqFgnv3588yYhYpkiOJr+9AYR/8Yl/Z5b7NfN D2piuYM41k6DgEHOs5cPNrfS0Xx0ZOrvghQ1UDgvhQVaoQBhjHAUbSa0mYzU3K4043 eU7HHIzWmPGpOCzFVVrJIwHKYApluNdjNITVqyJlTZd2c25jv0thCXBfr4oOGwHA0k qqlq3s5o+QBCpSi7Eg2Ej2KYSEUJN5dY6K2T9P4I9xFJ9Gyjkw3KVMztY7TU1g8k3g twmTnU9+7KTHA18W7hMKi0XVs1rTA9TOUnygcnyL/mMMTdQol9xkhR9X0iSnyF6W0w 5T47plY51kqRA== X-Rspamd-Queue-Id: AE82C1819E772 X-Spamd-Result: default: False [0.00 / 100.00] X-Rspamd-Server: rspam03 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: --=_MailMate_427835FB-543A-47DF-986F-D3245B801990_= Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable On 29 Jun 2020, at 11:19, Matthew Wilcox (Oracle) wrote: > Introduce the new page policy of PF_SECOND which lets us use the > normal pageflags generation machinery to create the various DoubleMap > manipulation functions. > > Signed-off-by: Matthew Wilcox (Oracle) > --- > include/linux/page-flags.h | 40 ++++++++++----------------------------= > 1 file changed, 10 insertions(+), 30 deletions(-) > > diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h > index b4e6051aa311..7182103583d2 100644 > --- a/include/linux/page-flags.h > +++ b/include/linux/page-flags.h > @@ -232,6 +232,9 @@ static inline void page_init_poison(struct page *pa= ge, size_t size) > * > * PF_NO_COMPOUND: > * the page flag is not relevant for compound pages. > + * > + * PF_SECOND: > + * the page flag is stored in the first tail page. Just wonder if PF_FIRST_TAIL_PAGE is more informative, although it has mo= re characters to type. :) =E2=80=94 Best Regards, Yan Zi --=_MailMate_427835FB-543A-47DF-986F-D3245B801990_= Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iQJDBAEBCgAtFiEEh7yFAW3gwjwQ4C9anbJR82th+ooFAl76NRYPHHppeUBudmlk aWEuY29tAAoJEJ2yUfNrYfqKgTQP/07tEqrkh0pijsgOxLRbvjBWJ3FcieEirKAF e/aviMoA5z0Y6ES+cZsZRiZQzpN6KYUznl4NYhupUExWunB2CiEGB+Cw2IEfa90A ySI6A5GOVfvvykW86apNJYC1AZd4rwA+rX3ZhDq+kiKgyM4IKO1s3ZhnDqktcXTZ lwL1ZNwUVKIuNDlebpklHhnfpDy3sjRl0pM0qdNDxTzzw/InDhxp2WOFtLRWbCQL i18hT5c1UmAdRuJCexSr2dKEliOeG/QksuN2afCXK03R9984qyMEpRA/7offZ9Lr kTNli+yAPzn0Ri68982UtLG6siaOQ45T6tFwMmRNSlU7iLWFNFOA5+7+p+Wllnnr 4RE5fmQzIZlrFPdLATf3K+LdTaTCJZCgyZeJJ6ONmwrkoAlGhMMlGnvL0qJKwJh6 A3AMGpuGczTc1JXZRwDLyA7LZrmOAk2c/oLwIW0hI44fXtI7CWtNLn16YGnWS1YD e+DUn9xpCC4Ewvw4fsLyFGGpXbus5VfN4YIhclDEovEYKfXx20wQD/7akXjVJDn0 ARKuYruq6u0fKSpD2RuyVa2DCnqAMMgtZ3es7/+r61Oi6xPMCsdYFS7T6MNiXR5J RdNcooYW+90MoL1qtFcFDJVXianobA7A5+bN4z/UisawmEPaqaPhGaSfC56slca1 VPAQmEx5 =1PmQ -----END PGP SIGNATURE----- --=_MailMate_427835FB-543A-47DF-986F-D3245B801990_=--