From: Geert Uytterhoeven <geert@linux-m68k.org>
To: Peter Xu <peterx@redhat.com>
Cc: Michal Hocko <mhocko@suse.com>,
"linux-ia64@vger.kernel.org" <linux-ia64@vger.kernel.org>,
Linux-sh list <linux-sh@vger.kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Muchun Song <songmuchun@bytedance.com>,
"open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
Linux MM <linux-mm@kvack.org>,
James Houghton <jthoughton@google.com>,
sparclinux <sparclinux@vger.kernel.org>,
Will Deacon <will@kernel.org>,
Mina Almasry <almasrymina@google.com>,
linux-s390 <linux-s390@vger.kernel.org>,
Christian Borntraeger <borntraeger@linux.ibm.com>,
Anshuman Khandual <anshuman.khandual@arm.com>,
Baolin Wang <baolin.wang@linux.alibaba.com>,
Paul Walmsley <paul.walmsley@sifive.com>,
Naoya Horiguchi <naoya.horiguchi@linux.dev>,
Linux ARM <linux-arm-kernel@lists.infradead.org>,
Parisc List <linux-parisc@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.vnet.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
linuxppc-d ev <linuxppc-dev@lists.ozlabs.org>,
Mike Kravetz <mike.kravetz@oracle.com>
Subject: Re: [PATCH 1/4] hugetlb: skip to end of PT page mapping when pte not present
Date: Fri, 17 Jun 2022 17:26:31 +0200 [thread overview]
Message-ID: <CAMuHMdU-qdNMqwtpm+PMixKoicYHPokAQqWAh-Vw-sjZz_z7xA@mail.gmail.com> (raw)
In-Reply-To: <YqyMhmAjrQ4C+EyA@xz-m1.local>
Hi Peter,
On Fri, Jun 17, 2022 at 4:22 PM Peter Xu <peterx@redhat.com> wrote:
> On Thu, Jun 16, 2022 at 02:05:15PM -0700, Mike Kravetz wrote:
> > @@ -6877,6 +6896,39 @@ pte_t *huge_pte_offset(struct mm_struct *mm,
> > return (pte_t *)pmd;
> > }
> >
> > +/*
> > + * Return a mask that can be used to update an address to the last huge
> > + * page in a page table page mapping size. Used to skip non-present
> > + * page table entries when linearly scanning address ranges. Architectures
> > + * with unique huge page to page table relationships can define their own
> > + * version of this routine.
> > + */
> > +unsigned long hugetlb_mask_last_page(struct hstate *h)
> > +{
> > + unsigned long hp_size = huge_page_size(h);
> > +
> > + switch (hp_size) {
> > + case P4D_SIZE:
> > + return PGDIR_SIZE - P4D_SIZE;
> > + case PUD_SIZE:
> > + return P4D_SIZE - PUD_SIZE;
> > + case PMD_SIZE:
> > + return PUD_SIZE - PMD_SIZE;
> > + default:
>
> Should we add a WARN_ON_ONCE() if it should never trigger?
And with panic_on_warn, it'll panic only once ;-)
Gr{oetje,eeting}s,
Geert
--
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@linux-m68k.org
In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
-- Linus Torvalds
next prev parent reply other threads:[~2022-06-17 15:27 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-06-16 21:05 [PATCH 0/4] hugetlb: speed up linear address scanning Mike Kravetz
2022-06-16 21:05 ` [PATCH 1/4] hugetlb: skip to end of PT page mapping when pte not present Mike Kravetz
2022-06-17 8:13 ` Muchun Song
2022-06-17 11:26 ` kernel test robot
2022-06-17 21:09 ` Mike Kravetz
2022-06-17 14:15 ` Peter Xu
2022-06-17 15:26 ` Geert Uytterhoeven [this message]
2022-06-17 17:17 ` Mike Kravetz
2022-06-18 3:27 ` Baolin Wang
2022-06-17 17:06 ` kernel test robot
2022-06-16 21:05 ` [PATCH 2/4] arm64/hugetlb: Implement arm64 specific hugetlb_mask_last_page Mike Kravetz
2022-06-17 8:26 ` Muchun Song
2022-06-16 21:05 ` [PATCH 3/4] hugetlb: do not update address in huge_pmd_unshare Mike Kravetz
2022-06-16 21:05 ` [PATCH 4/4] hugetlb: Lazy page table copies in fork() Mike Kravetz
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