From: Ram Pai <linuxram@us.ibm.com>
To: linuxppc-dev@lists.ozlabs.org
Cc: benh@kernel.crashing.org, paulus@samba.org, mpe@ellerman.id.au,
khandual@linux.vnet.ibm.com, aneesh.kumar@linux.vnet.ibm.com,
bsingharora@gmail.com, hbabu@us.ibm.com, linuxram@us.ibm.com,
mhocko@kernel.org
Subject: [PATCH 0/6] powerpc: Free up RPAGE_RSV bits in 64K PTE
Date: Fri, 21 Jul 2017 11:52:03 -0700 [thread overview]
Message-ID: <1500663129-10615-1-git-send-email-linuxram@us.ibm.com> (raw)
RPAGE_RSV0..4 pte bits are currently used for hpte slot
tracking. We need these bits for memory-protection
keys. Luckily these four bits are relatively easier
to move among all the other candidate bits.
For 64K linux-ptes backed by 4k hptes, these bits
are used for tracking the validity of the slot value
stored in the second-part-of-the-pte. We device a new
mechanism for tracking the validity without using
those bits. The mechanism is explained in the first
patch.
For 64K linux-pte backed by 64K hptes, we simply move
the slot tracking bits to the second-part-of-the-pte.
The above mechanism is also used to free the bits for
hugetlb linux-ptes.
Testing:
--------
has survived kernel compilation on multiple platforms
p8 powernv hash-mode, p9 powernv hash-mode, p7 powervm,
p8-powervm, p8-kvm-guest.
Has survived git-bisect on p8 power-nv with 64K page
and 4K page.
History:
-------
This patchset is a spin-off from the memkey patchset.
version v7:
(1) GIX bit reset change moved to the second
patch -- noticed by Aneesh.
(2) Separated this patches from memkey patchset
(3) merged a bunch of patches, that used the
helper function, into one.
version v6:
(1) No changes related to pte.
version v5:
(1) No changes related to pte.
version v4:
(1) No changes related to pte.
version v3:
(1) split the patches into smaller consumable
patches.
(2) A bug fix while invalidating a hpte slot
in __hash_page_4K()
-- noticed by Aneesh
version v2:
(1) fixed a bug in 4k hpte backed 64k pte
where page invalidation was not
done correctly, and initialization
of second-part-of-the-pte was not
done correctly if the pte was not
yet Hashed with a hpte.
-- Reported by Aneesh.
version v1: Initial version
Ram Pai (6):
powerpc: Free up four 64K PTE bits in 4K backed HPTE pages
powerpc: Free up four 64K PTE bits in 64K backed HPTE pages
powerpc: capture the PTE format changes in the dump pte report
powerpc: introduce pte_set_hash_slot() helper
powerpc: introduce pte_get_hash_gslot() helper
powerpc: use helper functions to get and set hash slots
arch/powerpc/include/asm/book3s/64/hash-4k.h | 20 ++++
arch/powerpc/include/asm/book3s/64/hash-64k.h | 60 ++++++++----
arch/powerpc/include/asm/book3s/64/hash.h | 7 +-
arch/powerpc/mm/dump_linuxpagetables.c | 3 +-
arch/powerpc/mm/hash64_4k.c | 14 +--
arch/powerpc/mm/hash64_64k.c | 124 +++++++++++++------------
arch/powerpc/mm/hash_utils_64.c | 35 +++++--
arch/powerpc/mm/hugetlbpage-hash64.c | 16 +--
8 files changed, 165 insertions(+), 114 deletions(-)
next reply other threads:[~2017-07-21 18:52 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-07-21 18:52 Ram Pai [this message]
2017-07-21 18:52 ` [PATCH 1/6] powerpc: Free up four 64K PTE bits in 4K backed HPTE pages Ram Pai
2017-07-26 10:35 ` Aneesh Kumar K.V
2017-07-26 16:06 ` Ram Pai
2017-07-27 1:59 ` Aneesh Kumar K.V
2017-07-27 8:00 ` Ram Pai
2017-07-21 18:52 ` [PATCH 2/6] powerpc: Free up four 64K PTE bits in 64K " Ram Pai
2017-07-21 18:52 ` [PATCH 3/6] powerpc: capture the PTE format changes in the dump pte report Ram Pai
2017-07-21 18:52 ` [PATCH 4/6] powerpc: introduce pte_set_hash_slot() helper Ram Pai
2017-07-21 18:52 ` [PATCH 5/6] powerpc: introduce pte_get_hash_gslot() helper Ram Pai
2017-07-21 18:52 ` [PATCH 6/6] powerpc: use helper functions to get and set hash slots Ram Pai
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