From: Matthew Wilcox <willy@infradead.org>
To: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Vineet Gupta <vineetg76@gmail.com>,
linux-arch <linux-arch@vger.kernel.org>,
Arnd Bergmann <arnd@arndb.de>,
Peter Zijlstra <peterz@infradead.org>,
"Aneesh Kumar K . V" <aneesh.kumar@linux.ibm.com>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Nick Piggin <npiggin@gmail.com>, Linux-MM <linux-mm@kvack.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-snps-arc@lists.infradead.org, Will Deacon <will@kernel.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>
Subject: Re: [RFC] asm-generic/tlb: stub out pmd_free_tlb() if __PAGETABLE_PMD_FOLDED
Date: Mon, 14 Oct 2019 14:48:02 -0700 [thread overview]
Message-ID: <20191014214802.GA32665@bombadil.infradead.org> (raw)
In-Reply-To: <CAHk-=wgUxgA-s4ZvxpcKDFfyoEmvcDr9Ydgo5W4s2hvrLHhP+g@mail.gmail.com>
On Mon, Oct 14, 2019 at 01:38:34PM -0700, Linus Torvalds wrote:
> And now I've said pgd/pud/p4d/pmd so many times that I've confused
> myself and think I'm wrong again, and I think that historically -
> originally - we always had a pgd, and then the pmd didn't exist
> because it was folded into it. That makes sense from a x86 naming
> standpoint. Then x86 _did_ get a pmd, and then we added more levels in
> between, and other architectures did things differently.
Oh my goodness. Thank you for writing all this out and finally getting
to this point. I was reading the whole thing thinking "This is different
from what I remember" and then you got here. This explains so much about
how our MM does/doesn't work, and it's not just me that's confused ;-)
prev parent reply other threads:[~2019-10-14 21:48 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-09 22:26 [PATCH 0/3] eldie generated code for folded p4d/pud Vineet Gupta
2019-10-09 22:26 ` [PATCH 1/3] asm-generic/tlb: stub out pud_free_tlb() if __PAGETABLE_PUD_FOLDED Vineet Gupta
2019-10-09 22:26 ` [PATCH 2/3] asm-generic/tlb: stub out p4d_free_tlb() if __PAGETABLE_P4D_FOLDED Vineet Gupta
2019-10-09 22:26 ` [PATCH 3/3] asm-generic/mm: stub out p{4,d}d_clear_bad() if __PAGETABLE_P{4,u}D_FOLDED Vineet Gupta
2019-10-10 7:29 ` [PATCH 0/3] eldie generated code for folded p4d/pud Peter Zijlstra
2019-10-10 8:56 ` Kirill A. Shutemov
2019-10-10 20:05 ` Vineet Gupta
2019-10-11 12:19 ` Kirill A. Shutemov
2019-10-11 22:38 ` [RFC] asm-generic/tlb: stub out pmd_free_tlb() if __PAGETABLE_PMD_FOLDED Vineet Gupta
2019-10-14 17:41 ` Linus Torvalds
2019-10-14 18:02 ` Vineet Gupta
2019-10-14 18:25 ` Linus Torvalds
2019-10-14 19:08 ` Vineet Gupta
2019-10-14 20:38 ` Linus Torvalds
2019-10-14 21:48 ` Matthew Wilcox [this message]
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