diff options
| author | Keith Busch <keith.busch@intel.com> | 2018-10-27 01:10:28 +0300 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2018-10-27 02:38:15 +0300 |
| commit | df06b37ffe5a442503b7095b77b0a970df515459 (patch) | |
| tree | 2fdb301eba4b4c2240595040496096b3a6489c79 /mm/nommu.c | |
| parent | 9fd61bc95130d4971568b89c9548b5e0a4e18e0e (diff) | |
| download | linux-df06b37ffe5a442503b7095b77b0a970df515459.tar.xz | |
mm/gup: cache dev_pagemap while pinning pages
Getting pages from ZONE_DEVICE memory needs to check the backing device's
live-ness, which is tracked in the device's dev_pagemap metadata. This
metadata is stored in a radix tree and looking it up adds measurable
software overhead.
This patch avoids repeating this relatively costly operation when
dev_pagemap is used by caching the last dev_pagemap while getting user
pages. The gup_benchmark kernel self test reports this reduces time to
get user pages to as low as 1/3 of the previous time.
Link: http://lkml.kernel.org/r/20181012173040.15669-1-keith.busch@intel.com
Signed-off-by: Keith Busch <keith.busch@intel.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
Acked-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Dave Hansen <dave.hansen@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/nommu.c')
| -rw-r--r-- | mm/nommu.c | 6 |
1 files changed, 2 insertions, 4 deletions
diff --git a/mm/nommu.c b/mm/nommu.c index e4aac33216ae..749276beb109 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1709,11 +1709,9 @@ SYSCALL_DEFINE5(mremap, unsigned long, addr, unsigned long, old_len, return ret; } -struct page *follow_page_mask(struct vm_area_struct *vma, - unsigned long address, unsigned int flags, - unsigned int *page_mask) +struct page *follow_page(struct vm_area_struct *vma, unsigned long address, + unsigned int foll_flags) { - *page_mask = 0; return NULL; } |