* [PATCH 1/2] mm: make dev_pagemap_mapping_shift() externally visible
[not found] <20181109203921.178363-1-brho@google.com>
@ 2018-11-09 20:39 ` Barret Rhoden
2018-11-13 9:28 ` David Hildenbrand
[not found] ` <20181114215155.259978-1-brho@google.com>
1 sibling, 1 reply; 5+ messages in thread
From: Barret Rhoden @ 2018-11-09 20:39 UTC (permalink / raw)
To: Dan Williams, Dave Jiang, Ross Zwisler, Vishal Verma,
Paolo Bonzini, Radim Krčmář,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Naoya Horiguchi
Cc: linux-nvdimm, linux-kernel, H. Peter Anvin, x86, kvm, yu.c.zhang,
yi.z.zhang, linux-mm
KVM has a use case for determining the size of a dax mapping. The KVM
code has easy access to the address and the mm; hence the change in
parameters.
Signed-off-by: Barret Rhoden <brho@google.com>
---
include/linux/mm.h | 3 +++
mm/memory-failure.c | 38 +++-----------------------------------
mm/util.c | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 40 insertions(+), 35 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5411de93a363..51215d695753 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -935,6 +935,9 @@ static inline bool is_pci_p2pdma_page(const struct page *page)
}
#endif /* CONFIG_DEV_PAGEMAP_OPS */
+unsigned long dev_pagemap_mapping_shift(unsigned long address,
+ struct mm_struct *mm);
+
static inline void get_page(struct page *page)
{
page = compound_head(page);
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 0cd3de3550f0..c3f2c6a8607e 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -265,40 +265,6 @@ void shake_page(struct page *p, int access)
}
EXPORT_SYMBOL_GPL(shake_page);
-static unsigned long dev_pagemap_mapping_shift(struct page *page,
- struct vm_area_struct *vma)
-{
- unsigned long address = vma_address(page, vma);
- pgd_t *pgd;
- p4d_t *p4d;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
-
- pgd = pgd_offset(vma->vm_mm, address);
- if (!pgd_present(*pgd))
- return 0;
- p4d = p4d_offset(pgd, address);
- if (!p4d_present(*p4d))
- return 0;
- pud = pud_offset(p4d, address);
- if (!pud_present(*pud))
- return 0;
- if (pud_devmap(*pud))
- return PUD_SHIFT;
- pmd = pmd_offset(pud, address);
- if (!pmd_present(*pmd))
- return 0;
- if (pmd_devmap(*pmd))
- return PMD_SHIFT;
- pte = pte_offset_map(pmd, address);
- if (!pte_present(*pte))
- return 0;
- if (pte_devmap(*pte))
- return PAGE_SHIFT;
- return 0;
-}
-
/*
* Failure handling: if we can't find or can't kill a process there's
* not much we can do. We just print a message and ignore otherwise.
@@ -329,7 +295,9 @@ static void add_to_kill(struct task_struct *tsk, struct page *p,
tk->addr = page_address_in_vma(p, vma);
tk->addr_valid = 1;
if (is_zone_device_page(p))
- tk->size_shift = dev_pagemap_mapping_shift(p, vma);
+ tk->size_shift =
+ dev_pagemap_mapping_shift(vma_address(page, vma),
+ vma->vm_mm);
else
tk->size_shift = compound_order(compound_head(p)) + PAGE_SHIFT;
diff --git a/mm/util.c b/mm/util.c
index 8bf08b5b5760..61bc9bab931d 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -780,3 +780,37 @@ int get_cmdline(struct task_struct *task, char *buffer, int buflen)
out:
return res;
}
+
+unsigned long dev_pagemap_mapping_shift(unsigned long address,
+ struct mm_struct *mm)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ pgd = pgd_offset(mm, address);
+ if (!pgd_present(*pgd))
+ return 0;
+ p4d = p4d_offset(pgd, address);
+ if (!p4d_present(*p4d))
+ return 0;
+ pud = pud_offset(p4d, address);
+ if (!pud_present(*pud))
+ return 0;
+ if (pud_devmap(*pud))
+ return PUD_SHIFT;
+ pmd = pmd_offset(pud, address);
+ if (!pmd_present(*pmd))
+ return 0;
+ if (pmd_devmap(*pmd))
+ return PMD_SHIFT;
+ pte = pte_offset_map(pmd, address);
+ if (!pte_present(*pte))
+ return 0;
+ if (pte_devmap(*pte))
+ return PAGE_SHIFT;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dev_pagemap_mapping_shift);
--
2.19.1.930.g4563a0d9d0-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH 1/2] mm: make dev_pagemap_mapping_shift() externally visible
2018-11-09 20:39 ` [PATCH 1/2] mm: make dev_pagemap_mapping_shift() externally visible Barret Rhoden
@ 2018-11-13 9:28 ` David Hildenbrand
0 siblings, 0 replies; 5+ messages in thread
From: David Hildenbrand @ 2018-11-13 9:28 UTC (permalink / raw)
To: Barret Rhoden, Dan Williams, Dave Jiang, Ross Zwisler,
Vishal Verma, Paolo Bonzini, Radim Krčmář,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Naoya Horiguchi
Cc: linux-nvdimm, linux-kernel, H. Peter Anvin, x86, kvm, yu.c.zhang,
yi.z.zhang, linux-mm
On 09.11.18 21:39, Barret Rhoden wrote:
> KVM has a use case for determining the size of a dax mapping. The KVM
> code has easy access to the address and the mm; hence the change in
> parameters.
>
> Signed-off-by: Barret Rhoden <brho@google.com>
> ---
> include/linux/mm.h | 3 +++
> mm/memory-failure.c | 38 +++-----------------------------------
> mm/util.c | 34 ++++++++++++++++++++++++++++++++++
> 3 files changed, 40 insertions(+), 35 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 5411de93a363..51215d695753 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -935,6 +935,9 @@ static inline bool is_pci_p2pdma_page(const struct page *page)
> }
> #endif /* CONFIG_DEV_PAGEMAP_OPS */
>
> +unsigned long dev_pagemap_mapping_shift(unsigned long address,
> + struct mm_struct *mm);
> +
> static inline void get_page(struct page *page)
> {
> page = compound_head(page);
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 0cd3de3550f0..c3f2c6a8607e 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -265,40 +265,6 @@ void shake_page(struct page *p, int access)
> }
> EXPORT_SYMBOL_GPL(shake_page);
>
> -static unsigned long dev_pagemap_mapping_shift(struct page *page,
> - struct vm_area_struct *vma)
> -{
> - unsigned long address = vma_address(page, vma);
> - pgd_t *pgd;
> - p4d_t *p4d;
> - pud_t *pud;
> - pmd_t *pmd;
> - pte_t *pte;
> -
> - pgd = pgd_offset(vma->vm_mm, address);
> - if (!pgd_present(*pgd))
> - return 0;
> - p4d = p4d_offset(pgd, address);
> - if (!p4d_present(*p4d))
> - return 0;
> - pud = pud_offset(p4d, address);
> - if (!pud_present(*pud))
> - return 0;
> - if (pud_devmap(*pud))
> - return PUD_SHIFT;
> - pmd = pmd_offset(pud, address);
> - if (!pmd_present(*pmd))
> - return 0;
> - if (pmd_devmap(*pmd))
> - return PMD_SHIFT;
> - pte = pte_offset_map(pmd, address);
> - if (!pte_present(*pte))
> - return 0;
> - if (pte_devmap(*pte))
> - return PAGE_SHIFT;
> - return 0;
> -}
> -
> /*
> * Failure handling: if we can't find or can't kill a process there's
> * not much we can do. We just print a message and ignore otherwise.
> @@ -329,7 +295,9 @@ static void add_to_kill(struct task_struct *tsk, struct page *p,
> tk->addr = page_address_in_vma(p, vma);
> tk->addr_valid = 1;
> if (is_zone_device_page(p))
> - tk->size_shift = dev_pagemap_mapping_shift(p, vma);
> + tk->size_shift =
> + dev_pagemap_mapping_shift(vma_address(page, vma),
> + vma->vm_mm);
> else
> tk->size_shift = compound_order(compound_head(p)) + PAGE_SHIFT;
>
> diff --git a/mm/util.c b/mm/util.c
> index 8bf08b5b5760..61bc9bab931d 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -780,3 +780,37 @@ int get_cmdline(struct task_struct *task, char *buffer, int buflen)
> out:
> return res;
> }
> +
> +unsigned long dev_pagemap_mapping_shift(unsigned long address,
> + struct mm_struct *mm)
> +{
> + pgd_t *pgd;
> + p4d_t *p4d;
> + pud_t *pud;
> + pmd_t *pmd;
> + pte_t *pte;
> +
> + pgd = pgd_offset(mm, address);
> + if (!pgd_present(*pgd))
> + return 0;
> + p4d = p4d_offset(pgd, address);
> + if (!p4d_present(*p4d))
> + return 0;
> + pud = pud_offset(p4d, address);
> + if (!pud_present(*pud))
> + return 0;
> + if (pud_devmap(*pud))
> + return PUD_SHIFT;
> + pmd = pmd_offset(pud, address);
> + if (!pmd_present(*pmd))
> + return 0;
> + if (pmd_devmap(*pmd))
> + return PMD_SHIFT;
> + pte = pte_offset_map(pmd, address);
> + if (!pte_present(*pte))
> + return 0;
> + if (pte_devmap(*pte))
> + return PAGE_SHIFT;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(dev_pagemap_mapping_shift);
>
Looks good to me
Reviewed-by: David Hildenbrand <david@redhat.com>
--
Thanks,
David / dhildenb
^ permalink raw reply [flat|nested] 5+ messages in thread
* [PATCH v2 1/3] mm: make dev_pagemap_mapping_shift() externally visible
[not found] ` <20181114215155.259978-1-brho@google.com>
@ 2018-11-14 21:51 ` Barret Rhoden
2018-11-26 16:50 ` Paolo Bonzini
2018-11-26 18:32 ` Dan Williams
0 siblings, 2 replies; 5+ messages in thread
From: Barret Rhoden @ 2018-11-14 21:51 UTC (permalink / raw)
To: Dan Williams, Dave Jiang, Ross Zwisler, Vishal Verma,
Paolo Bonzini, Radim Krčmář,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Naoya Horiguchi
Cc: linux-nvdimm, linux-kernel, H. Peter Anvin, x86, kvm, yu.c.zhang,
yi.z.zhang, linux-mm, David Hildenbrand
KVM has a use case for determining the size of a dax mapping. The KVM
code has easy access to the address and the mm; hence the change in
parameters.
Signed-off-by: Barret Rhoden <brho@google.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
---
include/linux/mm.h | 3 +++
mm/memory-failure.c | 38 +++-----------------------------------
mm/util.c | 34 ++++++++++++++++++++++++++++++++++
3 files changed, 40 insertions(+), 35 deletions(-)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index 5411de93a363..51215d695753 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -935,6 +935,9 @@ static inline bool is_pci_p2pdma_page(const struct page *page)
}
#endif /* CONFIG_DEV_PAGEMAP_OPS */
+unsigned long dev_pagemap_mapping_shift(unsigned long address,
+ struct mm_struct *mm);
+
static inline void get_page(struct page *page)
{
page = compound_head(page);
diff --git a/mm/memory-failure.c b/mm/memory-failure.c
index 0cd3de3550f0..c3f2c6a8607e 100644
--- a/mm/memory-failure.c
+++ b/mm/memory-failure.c
@@ -265,40 +265,6 @@ void shake_page(struct page *p, int access)
}
EXPORT_SYMBOL_GPL(shake_page);
-static unsigned long dev_pagemap_mapping_shift(struct page *page,
- struct vm_area_struct *vma)
-{
- unsigned long address = vma_address(page, vma);
- pgd_t *pgd;
- p4d_t *p4d;
- pud_t *pud;
- pmd_t *pmd;
- pte_t *pte;
-
- pgd = pgd_offset(vma->vm_mm, address);
- if (!pgd_present(*pgd))
- return 0;
- p4d = p4d_offset(pgd, address);
- if (!p4d_present(*p4d))
- return 0;
- pud = pud_offset(p4d, address);
- if (!pud_present(*pud))
- return 0;
- if (pud_devmap(*pud))
- return PUD_SHIFT;
- pmd = pmd_offset(pud, address);
- if (!pmd_present(*pmd))
- return 0;
- if (pmd_devmap(*pmd))
- return PMD_SHIFT;
- pte = pte_offset_map(pmd, address);
- if (!pte_present(*pte))
- return 0;
- if (pte_devmap(*pte))
- return PAGE_SHIFT;
- return 0;
-}
-
/*
* Failure handling: if we can't find or can't kill a process there's
* not much we can do. We just print a message and ignore otherwise.
@@ -329,7 +295,9 @@ static void add_to_kill(struct task_struct *tsk, struct page *p,
tk->addr = page_address_in_vma(p, vma);
tk->addr_valid = 1;
if (is_zone_device_page(p))
- tk->size_shift = dev_pagemap_mapping_shift(p, vma);
+ tk->size_shift =
+ dev_pagemap_mapping_shift(vma_address(page, vma),
+ vma->vm_mm);
else
tk->size_shift = compound_order(compound_head(p)) + PAGE_SHIFT;
diff --git a/mm/util.c b/mm/util.c
index 8bf08b5b5760..61bc9bab931d 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -780,3 +780,37 @@ int get_cmdline(struct task_struct *task, char *buffer, int buflen)
out:
return res;
}
+
+unsigned long dev_pagemap_mapping_shift(unsigned long address,
+ struct mm_struct *mm)
+{
+ pgd_t *pgd;
+ p4d_t *p4d;
+ pud_t *pud;
+ pmd_t *pmd;
+ pte_t *pte;
+
+ pgd = pgd_offset(mm, address);
+ if (!pgd_present(*pgd))
+ return 0;
+ p4d = p4d_offset(pgd, address);
+ if (!p4d_present(*p4d))
+ return 0;
+ pud = pud_offset(p4d, address);
+ if (!pud_present(*pud))
+ return 0;
+ if (pud_devmap(*pud))
+ return PUD_SHIFT;
+ pmd = pmd_offset(pud, address);
+ if (!pmd_present(*pmd))
+ return 0;
+ if (pmd_devmap(*pmd))
+ return PMD_SHIFT;
+ pte = pte_offset_map(pmd, address);
+ if (!pte_present(*pte))
+ return 0;
+ if (pte_devmap(*pte))
+ return PAGE_SHIFT;
+ return 0;
+}
+EXPORT_SYMBOL_GPL(dev_pagemap_mapping_shift);
--
2.19.1.1215.g8438c0b245-goog
^ permalink raw reply related [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/3] mm: make dev_pagemap_mapping_shift() externally visible
2018-11-14 21:51 ` [PATCH v2 1/3] " Barret Rhoden
@ 2018-11-26 16:50 ` Paolo Bonzini
2018-11-26 18:32 ` Dan Williams
1 sibling, 0 replies; 5+ messages in thread
From: Paolo Bonzini @ 2018-11-26 16:50 UTC (permalink / raw)
To: Barret Rhoden, Dan Williams, Dave Jiang, Ross Zwisler,
Vishal Verma, Radim Krčmář,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Naoya Horiguchi
Cc: linux-nvdimm, linux-kernel, H. Peter Anvin, x86, kvm, yu.c.zhang,
yi.z.zhang, linux-mm, David Hildenbrand, Andrew Morton
On 14/11/18 22:51, Barret Rhoden wrote:
> KVM has a use case for determining the size of a dax mapping. The KVM
> code has easy access to the address and the mm; hence the change in
> parameters.
>
> Signed-off-by: Barret Rhoden <brho@google.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
> ---
> include/linux/mm.h | 3 +++
> mm/memory-failure.c | 38 +++-----------------------------------
> mm/util.c | 34 ++++++++++++++++++++++++++++++++++
> 3 files changed, 40 insertions(+), 35 deletions(-)
>
> diff --git a/include/linux/mm.h b/include/linux/mm.h
> index 5411de93a363..51215d695753 100644
> --- a/include/linux/mm.h
> +++ b/include/linux/mm.h
> @@ -935,6 +935,9 @@ static inline bool is_pci_p2pdma_page(const struct page *page)
> }
> #endif /* CONFIG_DEV_PAGEMAP_OPS */
>
> +unsigned long dev_pagemap_mapping_shift(unsigned long address,
> + struct mm_struct *mm);
> +
> static inline void get_page(struct page *page)
> {
> page = compound_head(page);
> diff --git a/mm/memory-failure.c b/mm/memory-failure.c
> index 0cd3de3550f0..c3f2c6a8607e 100644
> --- a/mm/memory-failure.c
> +++ b/mm/memory-failure.c
> @@ -265,40 +265,6 @@ void shake_page(struct page *p, int access)
> }
> EXPORT_SYMBOL_GPL(shake_page);
>
> -static unsigned long dev_pagemap_mapping_shift(struct page *page,
> - struct vm_area_struct *vma)
> -{
> - unsigned long address = vma_address(page, vma);
> - pgd_t *pgd;
> - p4d_t *p4d;
> - pud_t *pud;
> - pmd_t *pmd;
> - pte_t *pte;
> -
> - pgd = pgd_offset(vma->vm_mm, address);
> - if (!pgd_present(*pgd))
> - return 0;
> - p4d = p4d_offset(pgd, address);
> - if (!p4d_present(*p4d))
> - return 0;
> - pud = pud_offset(p4d, address);
> - if (!pud_present(*pud))
> - return 0;
> - if (pud_devmap(*pud))
> - return PUD_SHIFT;
> - pmd = pmd_offset(pud, address);
> - if (!pmd_present(*pmd))
> - return 0;
> - if (pmd_devmap(*pmd))
> - return PMD_SHIFT;
> - pte = pte_offset_map(pmd, address);
> - if (!pte_present(*pte))
> - return 0;
> - if (pte_devmap(*pte))
> - return PAGE_SHIFT;
> - return 0;
> -}
> -
> /*
> * Failure handling: if we can't find or can't kill a process there's
> * not much we can do. We just print a message and ignore otherwise.
> @@ -329,7 +295,9 @@ static void add_to_kill(struct task_struct *tsk, struct page *p,
> tk->addr = page_address_in_vma(p, vma);
> tk->addr_valid = 1;
> if (is_zone_device_page(p))
> - tk->size_shift = dev_pagemap_mapping_shift(p, vma);
> + tk->size_shift =
> + dev_pagemap_mapping_shift(vma_address(page, vma),
> + vma->vm_mm);
> else
> tk->size_shift = compound_order(compound_head(p)) + PAGE_SHIFT;
>
> diff --git a/mm/util.c b/mm/util.c
> index 8bf08b5b5760..61bc9bab931d 100644
> --- a/mm/util.c
> +++ b/mm/util.c
> @@ -780,3 +780,37 @@ int get_cmdline(struct task_struct *task, char *buffer, int buflen)
> out:
> return res;
> }
> +
> +unsigned long dev_pagemap_mapping_shift(unsigned long address,
> + struct mm_struct *mm)
> +{
> + pgd_t *pgd;
> + p4d_t *p4d;
> + pud_t *pud;
> + pmd_t *pmd;
> + pte_t *pte;
> +
> + pgd = pgd_offset(mm, address);
> + if (!pgd_present(*pgd))
> + return 0;
> + p4d = p4d_offset(pgd, address);
> + if (!p4d_present(*p4d))
> + return 0;
> + pud = pud_offset(p4d, address);
> + if (!pud_present(*pud))
> + return 0;
> + if (pud_devmap(*pud))
> + return PUD_SHIFT;
> + pmd = pmd_offset(pud, address);
> + if (!pmd_present(*pmd))
> + return 0;
> + if (pmd_devmap(*pmd))
> + return PMD_SHIFT;
> + pte = pte_offset_map(pmd, address);
> + if (!pte_present(*pte))
> + return 0;
> + if (pte_devmap(*pte))
> + return PAGE_SHIFT;
> + return 0;
> +}
> +EXPORT_SYMBOL_GPL(dev_pagemap_mapping_shift);
>
Andrew,
can you ack this patch?
Thanks,
Paolo
^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: [PATCH v2 1/3] mm: make dev_pagemap_mapping_shift() externally visible
2018-11-14 21:51 ` [PATCH v2 1/3] " Barret Rhoden
2018-11-26 16:50 ` Paolo Bonzini
@ 2018-11-26 18:32 ` Dan Williams
1 sibling, 0 replies; 5+ messages in thread
From: Dan Williams @ 2018-11-26 18:32 UTC (permalink / raw)
To: Barret Rhoden
Cc: Dave Jiang, zwisler, Vishal L Verma, Paolo Bonzini, rkrcmar,
Thomas Gleixner, Ingo Molnar, Borislav Petkov, Naoya Horiguchi,
linux-nvdimm, Linux Kernel Mailing List, H. Peter Anvin, X86 ML,
KVM list, Zhang, Yu C, Zhang, Yi Z, Linux MM, David Hildenbrand
On Wed, Nov 14, 2018 at 1:53 PM Barret Rhoden <brho@google.com> wrote:
>
> KVM has a use case for determining the size of a dax mapping. The KVM
> code has easy access to the address and the mm; hence the change in
> parameters.
>
> Signed-off-by: Barret Rhoden <brho@google.com>
> Reviewed-by: David Hildenbrand <david@redhat.com>
Acked-by: Dan Williams <dan.j.williams@intel.com>
^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2018-11-26 18:32 UTC | newest]
Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed)
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[not found] <20181109203921.178363-1-brho@google.com>
2018-11-09 20:39 ` [PATCH 1/2] mm: make dev_pagemap_mapping_shift() externally visible Barret Rhoden
2018-11-13 9:28 ` David Hildenbrand
[not found] ` <20181114215155.259978-1-brho@google.com>
2018-11-14 21:51 ` [PATCH v2 1/3] " Barret Rhoden
2018-11-26 16:50 ` Paolo Bonzini
2018-11-26 18:32 ` Dan Williams
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