From: Ira Weiny <ira.weiny@intel.com>
To: John Hubbard <jhubbard@nvidia.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Jason Gunthorpe <jgg@ziepe.ca>,
Dan Williams <dan.j.williams@intel.com>,
Matthew Wilcox <willy@infradead.org>, Jan Kara <jack@suse.cz>,
Theodore Ts'o <tytso@mit.edu>, Michal Hocko <mhocko@suse.com>,
Dave Chinner <david@fromorbit.com>,
linux-xfs@vger.kernel.org, linux-rdma@vger.kernel.org,
linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org,
linux-nvdimm@lists.01.org, linux-ext4@vger.kernel.org,
linux-mm@kvack.org
Subject: Re: [RFC PATCH v2 11/19] mm/gup: Pass follow_page_context further down the call stack
Date: Mon, 12 Aug 2019 12:01:58 -0700 [thread overview]
Message-ID: <20190812190158.GA20634@iweiny-DESK2.sc.intel.com> (raw)
In-Reply-To: <57000521-cc09-9c33-9fa4-1fae5a3972c2@nvidia.com>
On Fri, Aug 09, 2019 at 05:18:31PM -0700, John Hubbard wrote:
> On 8/9/19 3:58 PM, ira.weiny@intel.com wrote:
> > From: Ira Weiny <ira.weiny@intel.com>
> >
> > In preparation for passing more information (vaddr_pin) into
> > follow_page_pte(), follow_devmap_pud(), and follow_devmap_pmd().
> >
> > Signed-off-by: Ira Weiny <ira.weiny@intel.com>
[snip]
> > @@ -786,7 +782,8 @@ static int check_vma_flags(struct vm_area_struct *vma, unsigned long gup_flags)
> > static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
> > unsigned long start, unsigned long nr_pages,
> > unsigned int gup_flags, struct page **pages,
> > - struct vm_area_struct **vmas, int *nonblocking)
> > + struct vm_area_struct **vmas, int *nonblocking,
> > + struct vaddr_pin *vaddr_pin)
>
> I didn't expect to see more vaddr_pin arg passing, based on the commit
> description. Did you want this as part of patch 9 or 10 instead? If not,
> then let's mention it in the commit description.
Yea that does seem out of place now that I look at it. I'll add to the commit
message because this is really getting vaddr_pin into the context _and_ passing
it down the stack. With all the rebasing I may have squashed something I did
not mean to. But I think this patch is ok because it is not to complicated to
see what is going on.
Thanks,
Ira
>
> > {
> > long ret = 0, i = 0;
> > struct vm_area_struct *vma = NULL;
> > @@ -797,6 +794,8 @@ static long __get_user_pages(struct task_struct *tsk, struct mm_struct *mm,
> >
> > VM_BUG_ON(!!pages != !!(gup_flags & FOLL_GET));
> >
> > + ctx.vaddr_pin = vaddr_pin;
> > +
> > /*
> > * If FOLL_FORCE is set then do not force a full fault as the hinting
> > * fault information is unrelated to the reference behaviour of a task
> > @@ -1025,7 +1024,7 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
> > lock_dropped = false;
> > for (;;) {
> > ret = __get_user_pages(tsk, mm, start, nr_pages, flags, pages,
> > - vmas, locked);
> > + vmas, locked, vaddr_pin);
> > if (!locked)
> > /* VM_FAULT_RETRY couldn't trigger, bypass */
> > return ret;
> > @@ -1068,7 +1067,7 @@ static __always_inline long __get_user_pages_locked(struct task_struct *tsk,
> > lock_dropped = true;
> > down_read(&mm->mmap_sem);
> > ret = __get_user_pages(tsk, mm, start, 1, flags | FOLL_TRIED,
> > - pages, NULL, NULL);
> > + pages, NULL, NULL, vaddr_pin);
> > if (ret != 1) {
> > BUG_ON(ret > 1);
> > if (!pages_done)
> > @@ -1226,7 +1225,7 @@ long populate_vma_page_range(struct vm_area_struct *vma,
> > * not result in a stack expansion that recurses back here.
> > */
> > return __get_user_pages(current, mm, start, nr_pages, gup_flags,
> > - NULL, NULL, nonblocking);
> > + NULL, NULL, nonblocking, NULL);
> > }
> >
> > /*
> > @@ -1311,7 +1310,7 @@ struct page *get_dump_page(unsigned long addr)
> >
> > if (__get_user_pages(current, current->mm, addr, 1,
> > FOLL_FORCE | FOLL_DUMP | FOLL_GET, &page, &vma,
> > - NULL) < 1)
> > + NULL, NULL) < 1)
> > return NULL;
> > flush_cache_page(vma, addr, page_to_pfn(page));
> > return page;
> > diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> > index bc1a07a55be1..7e09f2f17ed8 100644
> > --- a/mm/huge_memory.c
> > +++ b/mm/huge_memory.c
> > @@ -916,8 +916,9 @@ static void touch_pmd(struct vm_area_struct *vma, unsigned long addr,
> > }
> >
> > struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
> > - pmd_t *pmd, int flags, struct dev_pagemap **pgmap)
> > + pmd_t *pmd, int flags, struct follow_page_context *ctx)
> > {
> > + struct dev_pagemap **pgmap = &ctx->pgmap;
> > unsigned long pfn = pmd_pfn(*pmd);
> > struct mm_struct *mm = vma->vm_mm;
> > struct page *page;
> > @@ -1068,8 +1069,9 @@ static void touch_pud(struct vm_area_struct *vma, unsigned long addr,
> > }
> >
> > struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
> > - pud_t *pud, int flags, struct dev_pagemap **pgmap)
> > + pud_t *pud, int flags, struct follow_page_context *ctx)
> > {
> > + struct dev_pagemap **pgmap = &ctx->pgmap;
> > unsigned long pfn = pud_pfn(*pud);
> > struct mm_struct *mm = vma->vm_mm;
> > struct page *page;
> > diff --git a/mm/internal.h b/mm/internal.h
> > index 0d5f720c75ab..46ada5279856 100644
> > --- a/mm/internal.h
> > +++ b/mm/internal.h
> > @@ -12,6 +12,34 @@
> > #include <linux/pagemap.h>
> > #include <linux/tracepoint-defs.h>
> >
> > +struct follow_page_context {
> > + struct dev_pagemap *pgmap;
> > + unsigned int page_mask;
> > + struct vaddr_pin *vaddr_pin;
> > +};
> > +
> > +#ifdef CONFIG_TRANSPARENT_HUGEPAGE
> > +struct page *follow_devmap_pmd(struct vm_area_struct *vma, unsigned long addr,
> > + pmd_t *pmd, int flags, struct follow_page_context *ctx);
> > +struct page *follow_devmap_pud(struct vm_area_struct *vma, unsigned long addr,
> > + pud_t *pud, int flags, struct follow_page_context *ctx);
> > +#else
> > +static inline struct page *follow_devmap_pmd(struct vm_area_struct *vma,
> > + unsigned long addr, pmd_t *pmd, int flags,
> > + struct follow_page_context *ctx)
> > +{
> > + return NULL;
> > +}
> > +
> > +static inline struct page *follow_devmap_pud(struct vm_area_struct *vma,
> > + unsigned long addr, pud_t *pud, int flags,
> > + struct follow_page_context *ctx)
> > +{
> > + return NULL;
> > +}
> > +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */
> > +
> > +
> > /*
> > * The set of flags that only affect watermark checking and reclaim
> > * behaviour. This is used by the MM to obey the caller constraints
> >
>
>
>
>
> thanks,
> --
> John Hubbard
> NVIDIA
next prev parent reply other threads:[~2019-08-12 19:02 UTC|newest]
Thread overview: 110+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-08-09 22:58 [RFC PATCH v2 00/19] RDMA/FS DAX truncate proposal V1,000,002 ;-) ira.weiny
2019-08-09 22:58 ` [RFC PATCH v2 01/19] fs/locks: Export F_LAYOUT lease to user space ira.weiny
2019-08-09 23:52 ` Dave Chinner
2019-08-12 17:36 ` Ira Weiny
2019-08-14 8:05 ` Dave Chinner
2019-08-14 11:21 ` Jeff Layton
2019-08-14 11:38 ` Dave Chinner
2019-08-09 22:58 ` [RFC PATCH v2 02/19] fs/locks: Add Exclusive flag to user Layout lease ira.weiny
2019-08-14 14:15 ` Jeff Layton
2019-08-14 21:56 ` Dave Chinner
2019-08-26 10:41 ` Jeff Layton
2019-08-29 23:34 ` Ira Weiny
2019-09-04 12:52 ` Jeff Layton
2019-09-04 23:12 ` John Hubbard
2019-08-09 22:58 ` [RFC PATCH v2 03/19] mm/gup: Pass flags down to __gup_device_huge* calls ira.weiny
2019-08-09 22:58 ` [RFC PATCH v2 04/19] mm/gup: Ensure F_LAYOUT lease is held prior to GUP'ing pages ira.weiny
2019-08-09 22:58 ` [RFC PATCH v2 05/19] fs/ext4: Teach ext4 to break layout leases ira.weiny
2019-08-09 22:58 ` [RFC PATCH v2 06/19] fs/ext4: Teach dax_layout_busy_page() to operate on a sub-range ira.weiny
2019-08-23 15:18 ` Vivek Goyal
2019-08-29 18:52 ` Ira Weiny
2019-08-09 22:58 ` [RFC PATCH v2 07/19] fs/xfs: Teach xfs to use new dax_layout_busy_page() ira.weiny
2019-08-09 23:30 ` Dave Chinner
2019-08-12 18:05 ` Ira Weiny
2019-08-14 8:04 ` Dave Chinner
2019-08-09 22:58 ` [RFC PATCH v2 08/19] fs/xfs: Fail truncate if page lease can't be broken ira.weiny
2019-08-09 23:22 ` Dave Chinner
2019-08-12 18:08 ` Ira Weiny
2019-08-09 22:58 ` [RFC PATCH v2 09/19] mm/gup: Introduce vaddr_pin structure ira.weiny
2019-08-10 0:06 ` John Hubbard
2019-08-09 22:58 ` [RFC PATCH v2 10/19] mm/gup: Pass a NULL vaddr_pin through GUP fast ira.weiny
2019-08-10 0:06 ` John Hubbard
2019-08-09 22:58 ` [RFC PATCH v2 11/19] mm/gup: Pass follow_page_context further down the call stack ira.weiny
2019-08-10 0:18 ` John Hubbard
2019-08-12 19:01 ` Ira Weiny [this message]
2019-08-09 22:58 ` [RFC PATCH v2 12/19] mm/gup: Prep put_user_pages() to take an vaddr_pin struct ira.weiny
2019-08-10 0:30 ` John Hubbard
2019-08-12 20:46 ` Ira Weiny
2019-08-09 22:58 ` [RFC PATCH v2 13/19] {mm,file}: Add file_pins objects ira.weiny
2019-08-09 22:58 ` [RFC PATCH v2 14/19] fs/locks: Associate file pins while performing GUP ira.weiny
2019-08-09 22:58 ` [RFC PATCH v2 15/19] mm/gup: Introduce vaddr_pin_pages() ira.weiny
2019-08-10 0:09 ` John Hubbard
2019-08-12 21:00 ` Ira Weiny
2019-08-12 21:20 ` John Hubbard
2019-08-11 23:07 ` John Hubbard
2019-08-12 21:01 ` Ira Weiny
2019-08-12 12:28 ` Jason Gunthorpe
2019-08-12 21:48 ` Ira Weiny
2019-08-13 11:47 ` Jason Gunthorpe
2019-08-13 17:46 ` Ira Weiny
2019-08-13 17:56 ` John Hubbard
2019-08-09 22:58 ` [RFC PATCH v2 16/19] RDMA/uverbs: Add back pointer to system file object ira.weiny
2019-08-12 13:00 ` Jason Gunthorpe
2019-08-12 17:28 ` Ira Weiny
2019-08-12 17:56 ` Jason Gunthorpe
2019-08-12 21:15 ` Ira Weiny
2019-08-13 11:48 ` Jason Gunthorpe
2019-08-13 17:41 ` Ira Weiny
2019-08-13 18:00 ` Jason Gunthorpe
2019-08-13 20:38 ` Ira Weiny
2019-08-14 12:23 ` Jason Gunthorpe
2019-08-14 17:50 ` Ira Weiny
2019-08-14 18:15 ` Jason Gunthorpe
2019-09-04 22:25 ` Ira Weiny
2019-09-11 8:19 ` Jason Gunthorpe
2019-08-09 22:58 ` [RFC PATCH v2 17/19] RDMA/umem: Convert to vaddr_[pin|unpin]* operations ira.weiny
2019-08-09 22:58 ` [RFC PATCH v2 18/19] {mm,procfs}: Add display file_pins proc ira.weiny
2019-08-09 22:58 ` [RFC PATCH v2 19/19] mm/gup: Remove FOLL_LONGTERM DAX exclusion ira.weiny
2019-08-14 10:17 ` [RFC PATCH v2 00/19] RDMA/FS DAX truncate proposal V1,000,002 ;-) Jan Kara
2019-08-14 18:08 ` Ira Weiny
2019-08-15 13:05 ` Jan Kara
2019-08-16 19:05 ` Ira Weiny
2019-08-16 23:20 ` [RFC PATCH v2 00/19] RDMA/FS DAX truncate proposal V1,000,002 ; -) Ira Weiny
2019-08-19 6:36 ` Jan Kara
2019-08-17 2:26 ` [RFC PATCH v2 00/19] RDMA/FS DAX truncate proposal V1,000,002 ;-) Dave Chinner
2019-08-19 6:34 ` Jan Kara
2019-08-19 9:24 ` Dave Chinner
2019-08-19 12:38 ` Jason Gunthorpe
2019-08-19 21:53 ` Ira Weiny
2019-08-20 1:12 ` Dave Chinner
2019-08-20 11:55 ` Jason Gunthorpe
2019-08-21 18:02 ` Ira Weiny
2019-08-21 18:13 ` Jason Gunthorpe
2019-08-21 18:22 ` John Hubbard
2019-08-21 18:57 ` Ira Weiny
2019-08-21 19:06 ` Ira Weiny
2019-08-21 19:48 ` Jason Gunthorpe
2019-08-21 20:44 ` Ira Weiny
2019-08-21 23:49 ` Jason Gunthorpe
2019-08-23 3:23 ` Dave Chinner
2019-08-23 12:04 ` Jason Gunthorpe
2019-08-24 0:11 ` Dave Chinner
2019-08-24 5:08 ` Ira Weiny
2019-08-26 5:55 ` Dave Chinner
2019-08-29 2:02 ` Ira Weiny
2019-08-29 3:27 ` John Hubbard
2019-08-29 16:16 ` Ira Weiny
2019-09-02 22:26 ` Dave Chinner
2019-09-04 16:54 ` Ira Weiny
2019-08-25 19:39 ` Jason Gunthorpe
2019-08-24 4:49 ` Ira Weiny
2019-08-25 19:40 ` Jason Gunthorpe
2019-08-23 0:59 ` Dave Chinner
2019-08-23 17:15 ` Ira Weiny
2019-08-24 0:18 ` Dave Chinner
2019-08-20 0:05 ` John Hubbard
2019-08-20 1:20 ` Dave Chinner
2019-08-20 3:09 ` John Hubbard
2019-08-20 3:36 ` Dave Chinner
2019-08-21 18:43 ` John Hubbard
2019-08-21 19:09 ` Ira Weiny
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