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From: Ram Pai <linuxram@us.ibm.com>
To: Paul Mackerras <paulus@ozlabs.org>
Cc: linuxppc-dev@lists.ozlabs.org,
	"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: Re: [PATCH 00/16] Remove hash page table slot tracking from linux PTE
Date: Sun, 29 Oct 2017 17:51:06 -0700	[thread overview]
Message-ID: <20171030005106.GD5587@ram.oc3035372033.ibm.com> (raw)
In-Reply-To: <20171029220417.GA3317@fergus.ozlabs.ibm.com>

On Mon, Oct 30, 2017 at 09:04:17AM +1100, Paul Mackerras wrote:
> On Sat, Oct 28, 2017 at 03:35:32PM -0700, Ram Pai wrote:
> > 
> > I like the idea of not tracking the slots at all. It is something the
> > guest should not be knowing or tracking.
> 
> Why do you say that?

'slot' is a internal mechanism used by the hash table to accelerate
mapping an address to a hash-page.  If the hash-table implementation
choose to use a different mechanism to accelerate the mapping, it can't
because that mechanism is baked into the logic of all the consumers.

RP

  reply	other threads:[~2017-10-30  0:51 UTC|newest]

Thread overview: 31+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2017-10-27  4:08 [PATCH 00/16] Remove hash page table slot tracking from linux PTE Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 01/16] powerpc/mm/hash: Remove the superfluous bitwise operation when find hpte group Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 02/16] powerpc/mm: Update native_hpte_find to return hash pte Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 03/16] powerpc/pseries: Update hpte find helper to take hash value Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 04/16] powerpc/mm: Add hash invalidate callback Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 05/16] powerpc/mm: use hash_invalidate for __kernel_map_pages() Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 06/16] powerpc/mm: Switch flush_hash_range to not use slot Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 07/16] powerpc/mm: Add hash updatepp callback Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 08/16] powerpc/mm/hash: Don't track hash pte slot number in linux page table Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 09/16] powerpc/mm: Add new firmware feature HASH API Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 10/16] powerpc/kvm/hash: Implement HASH_REMOVE hcall Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 11/16] powerpc/kvm/hash: Implement HASH_PROTECT hcall Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 12/16] powerpc/kvm/hash: Implement HASH_BULK_REMOVE hcall Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 13/16] powerpc/mm/pseries: Use HASH_PROTECT hcall in guest Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 14/16] powerpc/mm/pseries: Use HASH_REMOVE " Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 15/16] powerpc/mm/pseries: Move slot based bulk remove to helper Aneesh Kumar K.V
2017-10-27  4:08 ` [PATCH 16/16] powerpc/mm/pseries: Use HASH_BULK_REMOVE hcall in guest Aneesh Kumar K.V
2017-10-27  4:34 ` [PATCH 00/16] Remove hash page table slot tracking from linux PTE Paul Mackerras
2017-10-27  5:27   ` Aneesh Kumar K.V
2017-10-27  5:41     ` Paul Mackerras
2017-10-30  7:57       ` Aneesh Kumar K.V
2017-10-30 11:49       ` Aneesh Kumar K.V
2017-10-30 13:14         ` Aneesh Kumar K.V
2017-10-30 13:49           ` Aneesh Kumar K.V
2017-11-21  8:41       ` Aneesh Kumar K.V
2017-10-28 22:35     ` Ram Pai
2017-10-29 14:05       ` Aneesh Kumar K.V
2017-10-29 22:04       ` Paul Mackerras
2017-10-30  0:51         ` Ram Pai [this message]
2017-11-01  4:46           ` Michael Ellerman
2017-11-01 11:02           ` Paul Mackerras

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