From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
To: benh@kernel.crashing.org, paulus@samba.org
Cc: linuxppc-dev@lists.ozlabs.org,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Subject: [PATCH -V10 05/15] powerpc: Update find_linux_pte_or_hugepte to handle transparent hugepages
Date: Wed, 5 Jun 2013 20:58:29 +0530 [thread overview]
Message-ID: <1370446119-8837-6-git-send-email-aneesh.kumar@linux.vnet.ibm.com> (raw)
In-Reply-To: <1370446119-8837-1-git-send-email-aneesh.kumar@linux.vnet.ibm.com>
From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>
Reviewed-by: David Gibson <dwg@au1.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
---
arch/powerpc/mm/hugetlbpage.c | 32 ++++++++++++++++++++++++++------
1 file changed, 26 insertions(+), 6 deletions(-)
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 2865077..4928204 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -936,30 +936,50 @@ pte_t *find_linux_pte_or_hugepte(pgd_t *pgdir, unsigned long ea, unsigned *shift
pg = pgdir + pgd_index(ea);
- if (pgd_huge(*pg)) {
+ /*
+ * we should first check for none. That takes care of a
+ * a parallel hugetlb or THP pagefault moving none entries
+ * to respective types.
+ */
+ if (pgd_none(*pg))
+ return NULL;
+ else if (pgd_huge(*pg)) {
ret_pte = (pte_t *) pg;
goto out;
} else if (is_hugepd(pg))
hpdp = (hugepd_t *)pg;
- else if (!pgd_none(*pg)) {
+ else {
pdshift = PUD_SHIFT;
pu = pud_offset(pg, ea);
- if (pud_huge(*pu)) {
+ if (pud_none(*pu))
+ return NULL;
+ else if (pud_huge(*pu)) {
ret_pte = (pte_t *) pu;
goto out;
} else if (is_hugepd(pu))
hpdp = (hugepd_t *)pu;
- else if (!pud_none(*pu)) {
+ else {
pdshift = PMD_SHIFT;
pm = pmd_offset(pu, ea);
+ /*
+ * A hugepage collapse is captured by pmd_none, because
+ * it mark the pmd none and do a hpte invalidate.
+ *
+ * A hugepage split is captured by pmd_trans_splitting
+ * because we mark the pmd trans splitting and do a
+ * hpte invalidate
+ *
+ */
+ if (pmd_none(*pm) || pmd_trans_splitting(*pm))
+ return NULL;
- if (pmd_huge(*pm)) {
+ if (pmd_huge(*pm) || pmd_large(*pm)) {
ret_pte = (pte_t *) pm;
goto out;
} else if (is_hugepd(pm))
hpdp = (hugepd_t *)pm;
- else if (!pmd_none(*pm))
+ else
return pte_offset_kernel(pm, ea);
}
}
--
1.8.1.2
next prev parent reply other threads:[~2013-06-05 15:28 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2013-06-05 15:28 [PATCH -V10 00/15] THP support for PPC64 Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 01/15] powerpc/mm: handle hugepage size correctly when invalidating hpte entries Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 02/15] powerpc/THP: Double the PMD table size for THP Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 03/15] powerpc/THP: Implement transparent hugepages for ppc64 Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 04/15] powerpc: move find_linux_pte_or_hugepte and gup_hugepte to common code Aneesh Kumar K.V
2013-06-05 15:28 ` Aneesh Kumar K.V [this message]
2013-06-05 15:28 ` [PATCH -V10 06/15] powerpc: Replace find_linux_pte with find_linux_pte_or_hugepte Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 07/15] powerpc: Update gup_pmd_range to handle transparent hugepages Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 08/15] powerpc/THP: Add code to handle HPTE faults for hugepages Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 09/15] powerpc: Make linux pagetable walk safe with THP enabled Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 10/15] powerpc: Prevent gcc to re-read the pagetables Aneesh Kumar K.V
2013-06-05 15:41 ` David Laight
2013-06-05 22:39 ` Benjamin Herrenschmidt
2013-06-05 15:28 ` [PATCH -V10 11/15] powerpc/THP: Enable THP on PPC64 Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 12/15] powerpc: Optimize hugepage invalidate Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 13/15] powerpc: disable assert_pte_locked for collapse_huge_page Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 14/15] powerpc: use smp_rmb when looking at deposisted pgtable to store hash index Aneesh Kumar K.V
2013-06-05 15:28 ` [PATCH -V10 15/15] powerpc: split hugepage when using subpage protection Aneesh Kumar K.V
2013-06-05 23:31 ` [PATCH -V10 00/15] THP support for PPC64 Benjamin Herrenschmidt
2013-06-06 0:13 ` Andrew Morton
2013-06-06 6:05 ` Aneesh Kumar K.V
2013-06-06 7:20 ` Andrew Morton
2013-06-16 2:00 ` Benjamin Herrenschmidt
2013-06-16 3:37 ` Benjamin Herrenschmidt
2013-06-16 4:06 ` Benjamin Herrenschmidt
2013-06-16 23:02 ` Benjamin Herrenschmidt
2013-06-18 18:46 ` Aneesh Kumar K.V
2013-06-18 22:03 ` Benjamin Herrenschmidt
2013-06-19 3:30 ` Aneesh Kumar K.V
2013-06-18 17:54 ` Aneesh Kumar K.V
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