From: Leonardo Bras <leonardo@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org
Cc: Leonardo Bras <leonardo@linux.ibm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Arnd Bergmann <arnd@arndb.de>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Andrew Morton <akpm@linux-foundation.org>,
Dan Williams <dan.j.williams@intel.com>,
Nicholas Piggin <npiggin@gmail.com>,
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ganesh Goudar <ganeshgr@linux.ibm.com>,
Allison Randal <allison@lohutok.net>,
Mike Rapoport <rppt@linux.ibm.com>,
YueHaibing <yuehaibing@huawei.com>,
Ira Weiny <ira.weiny@intel.com>, Jason Gunthorpe <jgg@ziepe.ca>,
John Hubbard <jhubbard@nvidia.com>,
Keith Busch <keith.busch@intel.com>
Subject: [PATCH v3 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks
Date: Tue, 24 Sep 2019 18:24:21 -0300 [thread overview]
Message-ID: <20190924212427.7734-5-leonardo@linux.ibm.com> (raw)
In-Reply-To: <20190924212427.7734-1-leonardo@linux.ibm.com>
Applies the counting-based method for monitoring lockless pgtable walks on
addr_to_pfn().
Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
---
arch/powerpc/kernel/mce_power.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c
index a814d2dfb5b0..0f2f87da4cd1 100644
--- a/arch/powerpc/kernel/mce_power.c
+++ b/arch/powerpc/kernel/mce_power.c
@@ -27,6 +27,7 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
{
pte_t *ptep;
unsigned long flags;
+ unsigned long pfn;
struct mm_struct *mm;
if (user_mode(regs))
@@ -34,15 +35,21 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
else
mm = &init_mm;
+ start_lockless_pgtbl_walk(mm);
local_irq_save(flags);
if (mm == current->mm)
ptep = find_current_mm_pte(mm->pgd, addr, NULL, NULL);
else
ptep = find_init_mm_pte(addr, NULL);
- local_irq_restore(flags);
+
if (!ptep || pte_special(*ptep))
- return ULONG_MAX;
- return pte_pfn(*ptep);
+ pfn = ULONG_MAX;
+ else
+ pfn = pte_pfn(*ptep);
+
+ local_irq_restore(flags);
+ end_lockless_pgtbl_walk(mm);
+ return pfn;
}
/* flush SLBs and reload */
--
2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Leonardo Bras <leonardo@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org
Cc: Leonardo Bras <leonardo@linux.ibm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Arnd Bergmann <arnd@arndb.de>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Andrew Morton <akpm@linux-foundation.org>,
Dan Williams <dan.j.williams@intel.com>,
Nicholas Piggin <npiggin@gmail.com>,
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ganesh Goudar <ganeshgr@linux.ibm.com>,
Allison Randal <allison@lohutok.net>,
Mike Rapoport <rppt@linux.ibm.com>,
YueHaibing <yuehaibing@huawei.com>,
Ira Weiny <ira.weiny@intel.com>, Jason Gunthorpe <jgg@ziep>
Subject: [PATCH v3 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks
Date: Tue, 24 Sep 2019 18:24:21 -0300 [thread overview]
Message-ID: <20190924212427.7734-5-leonardo@linux.ibm.com> (raw)
In-Reply-To: <20190924212427.7734-1-leonardo@linux.ibm.com>
Applies the counting-based method for monitoring lockless pgtable walks on
addr_to_pfn().
Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
---
arch/powerpc/kernel/mce_power.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c
index a814d2dfb5b0..0f2f87da4cd1 100644
--- a/arch/powerpc/kernel/mce_power.c
+++ b/arch/powerpc/kernel/mce_power.c
@@ -27,6 +27,7 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
{
pte_t *ptep;
unsigned long flags;
+ unsigned long pfn;
struct mm_struct *mm;
if (user_mode(regs))
@@ -34,15 +35,21 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
else
mm = &init_mm;
+ start_lockless_pgtbl_walk(mm);
local_irq_save(flags);
if (mm == current->mm)
ptep = find_current_mm_pte(mm->pgd, addr, NULL, NULL);
else
ptep = find_init_mm_pte(addr, NULL);
- local_irq_restore(flags);
+
if (!ptep || pte_special(*ptep))
- return ULONG_MAX;
- return pte_pfn(*ptep);
+ pfn = ULONG_MAX;
+ else
+ pfn = pte_pfn(*ptep);
+
+ local_irq_restore(flags);
+ end_lockless_pgtbl_walk(mm);
+ return pfn;
}
/* flush SLBs and reload */
--
2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Leonardo Bras <leonardo@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org
Cc: Keith Busch <keith.busch@intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Arnd Bergmann <arnd@arndb.de>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Ganesh Goudar <ganeshgr@linux.ibm.com>,
YueHaibing <yuehaibing@huawei.com>,
Nicholas Piggin <npiggin@gmail.com>,
Mike Rapoport <rppt@linux.ibm.com>,
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>,
Jason Gunthorpe <jgg@ziepe.ca>, Paul Mackerras <paulus@samba.org>,
John Hubbard <jhubbard@nvidia.com>,
Leonardo Bras <leonardo@linux.ibm.com>,
Andrew Morton <akpm@linux-foundation.org>,
Ira Weiny <ira.weiny@intel.com>,
Dan Williams <dan.j.williams@intel.com>,
Allison Randal <allison@lohutok.net>
Subject: [PATCH v3 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks
Date: Tue, 24 Sep 2019 18:24:21 -0300 [thread overview]
Message-ID: <20190924212427.7734-5-leonardo@linux.ibm.com> (raw)
In-Reply-To: <20190924212427.7734-1-leonardo@linux.ibm.com>
Applies the counting-based method for monitoring lockless pgtable walks on
addr_to_pfn().
Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
---
arch/powerpc/kernel/mce_power.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c
index a814d2dfb5b0..0f2f87da4cd1 100644
--- a/arch/powerpc/kernel/mce_power.c
+++ b/arch/powerpc/kernel/mce_power.c
@@ -27,6 +27,7 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
{
pte_t *ptep;
unsigned long flags;
+ unsigned long pfn;
struct mm_struct *mm;
if (user_mode(regs))
@@ -34,15 +35,21 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
else
mm = &init_mm;
+ start_lockless_pgtbl_walk(mm);
local_irq_save(flags);
if (mm == current->mm)
ptep = find_current_mm_pte(mm->pgd, addr, NULL, NULL);
else
ptep = find_init_mm_pte(addr, NULL);
- local_irq_restore(flags);
+
if (!ptep || pte_special(*ptep))
- return ULONG_MAX;
- return pte_pfn(*ptep);
+ pfn = ULONG_MAX;
+ else
+ pfn = pte_pfn(*ptep);
+
+ local_irq_restore(flags);
+ end_lockless_pgtbl_walk(mm);
+ return pfn;
}
/* flush SLBs and reload */
--
2.20.1
WARNING: multiple messages have this Message-ID (diff)
From: Leonardo Bras <leonardo@linux.ibm.com>
To: linuxppc-dev@lists.ozlabs.org, linux-kernel@vger.kernel.org,
kvm-ppc@vger.kernel.org, linux-arch@vger.kernel.org,
linux-mm@kvack.org
Cc: Leonardo Bras <leonardo@linux.ibm.com>,
Benjamin Herrenschmidt <benh@kernel.crashing.org>,
Paul Mackerras <paulus@samba.org>,
Michael Ellerman <mpe@ellerman.id.au>,
Arnd Bergmann <arnd@arndb.de>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.ibm.com>,
Christophe Leroy <christophe.leroy@c-s.fr>,
Andrew Morton <akpm@linux-foundation.org>,
Dan Williams <dan.j.williams@intel.com>,
Nicholas Piggin <npiggin@gmail.com>,
Mahesh Salgaonkar <mahesh@linux.vnet.ibm.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ganesh Goudar <ganeshgr@linux.ibm.com>,
Allison Randal <allison@lohutok.net>,
Mike Rapoport <rppt@linux.ibm.com>,
YueHaibing <yuehaibing@huawei.com>,
Ira Weiny <ira.weiny@intel.com>, Jason Gunthorpe <jgg@ziepe.ca>,
John Hubbard <jhubbard@nvidia.com>,
Keith Busch <keith.busch@intel.com>
Subject: [PATCH v3 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks
Date: Tue, 24 Sep 2019 21:24:21 +0000 [thread overview]
Message-ID: <20190924212427.7734-5-leonardo@linux.ibm.com> (raw)
In-Reply-To: <20190924212427.7734-1-leonardo@linux.ibm.com>
Applies the counting-based method for monitoring lockless pgtable walks on
addr_to_pfn().
Signed-off-by: Leonardo Bras <leonardo@linux.ibm.com>
---
arch/powerpc/kernel/mce_power.c | 13 ++++++++++---
1 file changed, 10 insertions(+), 3 deletions(-)
diff --git a/arch/powerpc/kernel/mce_power.c b/arch/powerpc/kernel/mce_power.c
index a814d2dfb5b0..0f2f87da4cd1 100644
--- a/arch/powerpc/kernel/mce_power.c
+++ b/arch/powerpc/kernel/mce_power.c
@@ -27,6 +27,7 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
{
pte_t *ptep;
unsigned long flags;
+ unsigned long pfn;
struct mm_struct *mm;
if (user_mode(regs))
@@ -34,15 +35,21 @@ unsigned long addr_to_pfn(struct pt_regs *regs, unsigned long addr)
else
mm = &init_mm;
+ start_lockless_pgtbl_walk(mm);
local_irq_save(flags);
if (mm = current->mm)
ptep = find_current_mm_pte(mm->pgd, addr, NULL, NULL);
else
ptep = find_init_mm_pte(addr, NULL);
- local_irq_restore(flags);
+
if (!ptep || pte_special(*ptep))
- return ULONG_MAX;
- return pte_pfn(*ptep);
+ pfn = ULONG_MAX;
+ else
+ pfn = pte_pfn(*ptep);
+
+ local_irq_restore(flags);
+ end_lockless_pgtbl_walk(mm);
+ return pfn;
}
/* flush SLBs and reload */
--
2.20.1
next prev parent reply other threads:[~2019-09-24 21:25 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-09-24 21:24 [PATCH v3 00/11] Introduces new count-based method for monitoring lockless pagetable walks Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 01/11] powerpc/mm: Adds counting method to monitor lockless pgtable walks Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 02/11] asm-generic/pgtable: Adds dummy functions " Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 03/11] mm/gup: Applies counting method to monitor gup_pgd_range Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras [this message]
2019-09-24 21:24 ` [PATCH v3 04/11] powerpc/mce_power: Applies counting method to monitor lockless pgtbl walks Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 05/11] powerpc/perf: " Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 06/11] powerpc/mm/book3s64/hash: " Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 07/11] powerpc/kvm/e500: " Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 08/11] powerpc/kvm/book3s_hv: " Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 09/11] powerpc/kvm/book3s_64: " Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 10/11] powerpc/book3s_64: Enables counting method to monitor lockless pgtbl walk Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` [PATCH v3 11/11] powerpc/mm/book3s64/pgtable: Uses counting method to skip serializing Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 21:24 ` Leonardo Bras
2019-09-24 22:58 ` [PATCH v3 00/11] Introduces new count-based method for monitoring lockless pagetable walks John Hubbard
2019-09-24 22:58 ` John Hubbard
2019-09-24 22:58 ` John Hubbard
2019-09-27 14:46 Leonardo Bras
2019-09-27 14:46 ` Leonardo Bras
2019-09-27 14:46 ` Leonardo Bras
2019-09-27 23:25 ` Leonardo Bras
2019-09-27 23:25 ` Leonardo Bras
2019-09-27 23:25 ` Leonardo Bras
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