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* [PATCH v2 0/4] mm/gup, drm/i915: refactor gup_fast, convert to pin_user_pages()
@ 2020-05-22  5:19 ` John Hubbard
  0 siblings, 0 replies; 26+ messages in thread
From: John Hubbard @ 2020-05-22  5:19 UTC (permalink / raw)
  To: Andrew Morton
  Cc: Souptick Joarder, Matthew Wilcox, Jani Nikula, Joonas Lahtinen,
	Rodrigo Vivi, David Airlie, Daniel Vetter, Chris Wilson,
	Tvrtko Ursulin, Matthew Auld, intel-gfx, dri-devel, LKML,
	linux-mm, John Hubbard

The purpose of posting this series is to launch a test in the
intel-gfx-ci tree. (The patches have already been merged into Andrew's
linux-mm tree.)

This applies to today's linux.git (note the base-commit tag at the
bottom).

Changes since V1:

* Fixed a bug in the refactoring patch: added FOLL_FAST_ONLY to the
  list of gup_flags *not* to WARN() on. This lead to a failure in the
  first intel-gfx-ci test run [1].

[1] https://lore.kernel.org/r/159008745422.32320.5724805750977048669@build.alporthouse.com

Original cover letter:

This needs to go through Andrew's -mm tree, due to adding a new gup.c
routine. However, I would really love to have some testing from the
drm/i915 folks, because I haven't been able to run-time test that part
of it.

Otherwise, though, the series has passed my basic run time testing:
some LTP tests, some xfs and etx4 non-destructive xfstests, and an
assortment of other smaller ones: vm selftests, io_uring_register, a
few more. But that's only on one particular machine. Also, cross-compile
tests for half a dozen arches all pass.

Details:

In order to convert the drm/i915 driver from get_user_pages() to
pin_user_pages(), a FOLL_PIN equivalent of __get_user_pages_fast() was
required. That led to refactoring __get_user_pages_fast(), with the
following goals:

1) As above: provide a pin_user_pages*() routine for drm/i915 to call,
   in place of __get_user_pages_fast(),

2) Get rid of the gup.c duplicate code for walking page tables with
   interrupts disabled. This duplicate code is a minor maintenance
   problem anyway.

3) Make it easy for an upcoming patch from Souptick, which aims to
   convert __get_user_pages_fast() to use a gup_flags argument, instead
   of a bool writeable arg.  Also, if this series looks good, we can
   ask Souptick to change the name as well, to whatever the consensus
   is. My initial recommendation is: get_user_pages_fast_only(), to
   match the new pin_user_pages_only().

John Hubbard (4):
  mm/gup: move __get_user_pages_fast() down a few lines in gup.c
  mm/gup: refactor and de-duplicate gup_fast() code
  mm/gup: introduce pin_user_pages_fast_only()
  drm/i915: convert get_user_pages() --> pin_user_pages()

 drivers/gpu/drm/i915/gem/i915_gem_userptr.c |  22 +--
 include/linux/mm.h                          |   3 +
 mm/gup.c                                    | 153 ++++++++++++--------
 3 files changed, 109 insertions(+), 69 deletions(-)


base-commit: 051143e1602d90ea71887d92363edd539d411de5
-- 
2.26.2


^ permalink raw reply	[flat|nested] 26+ messages in thread
* [PATCH 0/4] mm/gup, drm/i915: refactor gup_fast, convert to pin_user_pages()
@ 2020-05-19  0:21 John Hubbard
  2020-05-19  3:52 ` [Intel-gfx] ✗ Fi.CI.IGT: failure for " Patchwork
  0 siblings, 1 reply; 26+ messages in thread
From: John Hubbard @ 2020-05-19  0:21 UTC (permalink / raw)
  To: Andrew Morton
  Cc: Souptick Joarder, Matthew Wilcox, Jani Nikula, Joonas Lahtinen,
	Rodrigo Vivi, David Airlie, Daniel Vetter, Chris Wilson,
	Tvrtko Ursulin, Matthew Auld, intel-gfx, dri-devel, LKML,
	linux-mm, John Hubbard

This needs to go through Andrew's -mm tree, due to adding a new gup.c
routine. However, I would really love to have some testing from the
drm/i915 folks, because I haven't been able to run-time test that part
of it.

Otherwise, though, the series has passed my basic run time testing:
some LTP tests, some xfs and etx4 non-destructive xfstests, and an
assortment of other smaller ones: vm selftests, io_uring_register, a
few more. But that's only on one particular machine. Also, cross-compile
tests for half a dozen arches all pass.

Details:

In order to convert the drm/i915 driver from get_user_pages() to
pin_user_pages(), a FOLL_PIN equivalent of __get_user_pages_fast() was
required. That led to refactoring __get_user_pages_fast(), with the
following goals:

1) As above: provide a pin_user_pages*() routine for drm/i915 to call,
   in place of __get_user_pages_fast(),

2) Get rid of the gup.c duplicate code for walking page tables with
   interrupts disabled. This duplicate code is a minor maintenance
   problem anyway.

3) Make it easy for an upcoming patch from Souptick, which aims to
   convert __get_user_pages_fast() to use a gup_flags argument, instead
   of a bool writeable arg.  Also, if this series looks good, we can
   ask Souptick to change the name as well, to whatever the consensus
   is. My initial recommendation is: get_user_pages_fast_only(), to
   match the new pin_user_pages_only().

John Hubbard (4):
  mm/gup: move __get_user_pages_fast() down a few lines in gup.c
  mm/gup: refactor and de-duplicate gup_fast() code
  mm/gup: introduce pin_user_pages_fast_only()
  drm/i915: convert get_user_pages() --> pin_user_pages()

 drivers/gpu/drm/i915/gem/i915_gem_userptr.c |  22 +--
 include/linux/mm.h                          |   3 +
 mm/gup.c                                    | 150 ++++++++++++--------
 3 files changed, 107 insertions(+), 68 deletions(-)


base-commit: 642b151f45dd54809ea00ecd3976a56c1ec9b53d
-- 
2.26.2


^ permalink raw reply	[flat|nested] 26+ messages in thread

end of thread, other threads:[~2020-05-26 16:58 UTC | newest]

Thread overview: 26+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2020-05-22  5:19 [PATCH v2 0/4] mm/gup, drm/i915: refactor gup_fast, convert to pin_user_pages() John Hubbard
2020-05-22  5:19 ` [Intel-gfx] " John Hubbard
2020-05-22  5:19 ` John Hubbard
2020-05-22  5:19 ` [PATCH v2 1/4] mm/gup: move __get_user_pages_fast() down a few lines in gup.c John Hubbard
2020-05-22  5:19   ` [Intel-gfx] " John Hubbard
2020-05-22  5:19   ` John Hubbard
2020-05-22  5:19 ` [PATCH v2 2/4] mm/gup: refactor and de-duplicate gup_fast() code John Hubbard
2020-05-22  5:19   ` [Intel-gfx] " John Hubbard
2020-05-22  5:19   ` John Hubbard
2020-05-22  5:19 ` [PATCH v2 3/4] mm/gup: introduce pin_user_pages_fast_only() John Hubbard
2020-05-22  5:19   ` [Intel-gfx] " John Hubbard
2020-05-22  5:19   ` John Hubbard
2020-05-22  5:19 ` [PATCH v2 4/4] drm/i915: convert get_user_pages() --> pin_user_pages() John Hubbard
2020-05-22  5:19   ` [Intel-gfx] " John Hubbard
2020-05-22  5:19   ` John Hubbard
2020-05-23  9:41 ` [PATCH v2 0/4] mm/gup, drm/i915: refactor gup_fast, convert to pin_user_pages() Chris Wilson
2020-05-23  9:41   ` [Intel-gfx] " Chris Wilson
2020-05-23  9:41   ` Chris Wilson
2020-05-23 22:33   ` John Hubbard
2020-05-23 22:33     ` [Intel-gfx] " John Hubbard
2020-05-23 22:33     ` John Hubbard
2020-05-23 18:35 ` [Intel-gfx] ✗ Fi.CI.CHECKPATCH: warning for " Patchwork
2020-05-23 18:37 ` [Intel-gfx] ✗ Fi.CI.SPARSE: " Patchwork
2020-05-23 20:34 ` [Intel-gfx] ✓ Fi.CI.BAT: success " Patchwork
2020-05-23 21:35 ` [Intel-gfx] ✗ Fi.CI.IGT: failure " Patchwork
  -- strict thread matches above, loose matches on Subject: below --
2020-05-19  0:21 [PATCH 0/4] " John Hubbard
2020-05-19  3:52 ` [Intel-gfx] ✗ Fi.CI.IGT: failure for " Patchwork

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