linux-stable.git/mm/damon, branch linux-6.3.y

mm/damon/core: fix divide error in damon_nr_accesses_to_accesses_bp()

2023-06-21T14:02:08+00:00

commit 5ff6e2fff88ef9bf110c5e85a48e7b557bfc64c1 upstream.

If 'aggr_interval' is smaller than 'sample_interval', max_nr_accesses in
damon_nr_accesses_to_accesses_bp() becomes zero which leads to divide
error, let's validate the values of them in damon_set_attrs() to fix it,
which similar to others attrs check.

Link: https://lkml.kernel.org/r/20230527032101.167788-1-wangkefeng.wang@huawei.com
Fixes: 2f5bef5a590b ("mm/damon/core: update monitoring results for new monitoring attributes")
Reported-by: syzbot+841a46899768ec7bec67@syzkaller.appspotmail.com
Closes: https://syzkaller.appspot.com/bug?extid=841a46899768ec7bec67
Link: https://lore.kernel.org/damon/00000000000055fc4e05fc975bc2@google.com/
Reviewed-by: SeongJae Park 
Signed-off-by: Kefeng Wang 
Cc: 
Signed-off-by: Andrew Morton 
Signed-off-by: Greg Kroah-Hartman

mm/damon/paddr: fix folio_nr_pages() after folio_put() in damon_pa_mark_accessed_or_deactivate()

2023-03-08T01:04:55+00:00

damon_pa_mark_accessed_or_deactivate() is accessing a folio via
folio_nr_pages() after folio_put() for the folio has invoked.  Fix it.

Link: https://lkml.kernel.org/r/20230304193949.296391-3-sj@kernel.org
Fixes: f70da5ee8fe1 ("mm/damon: convert damon_pa_mark_accessed_or_deactivate() to use folios")
Signed-off-by: SeongJae Park 
Reviewed-by: Kefeng Wang 
Reviewed-by: Matthew Wilcox (Oracle) 
Cc: Vishal Moola (Oracle) 
Signed-off-by: Andrew Morton

mm/damon/paddr: fix folio_size() call after folio_put() in damon_pa_young()

2023-03-08T01:04:55+00:00

Patch series "mm/damon/paddr: Fix folio-use-after-put bugs".

There are two folio accesses after folio_put() in mm/damon/paddr.c file. 
Fix those.


This patch (of 2):

damon_pa_young() is accessing a folio via folio_size() after folio_put()
for the folio has invoked.  Fix it.

Link: https://lkml.kernel.org/r/20230304193949.296391-1-sj@kernel.org
Link: https://lkml.kernel.org/r/20230304193949.296391-2-sj@kernel.org
Fixes: 397b0c3a584b ("mm/damon/paddr: remove folio_sz field from damon_pa_access_chk_result")
Signed-off-by: SeongJae Park 
Reviewed-by: Kefeng Wang 
Reviewed-by: Matthew Wilcox (Oracle) 
Cc: Vishal Moola (Oracle) 
Cc: 	[6.2.x]
Signed-off-by: Andrew Morton

mm/damon/paddr: fix missing folio_put()

2023-02-28T01:00:14+00:00

damon_get_folio() would always increase folio _refcount and
folio_isolate_lru() would increase folio _refcount if the folio's lru flag
is set.

If an unevictable folio isolated successfully, there will be two more
_refcount.  The one from folio_isolate_lru() will be decreased in
folio_puback_lru(), but the other one from damon_get_folio() will be left
behind.  This causes a pin page.

Whatever the case, the _refcount from damon_get_folio() should be
decreased.

Link: https://lkml.kernel.org/r/20230222064223.6735-1-andrew.yang@mediatek.com
Fixes: 57223ac29584 ("mm/damon/paddr: support the pageout scheme")
Signed-off-by: andrew.yang 
Reviewed-by: SeongJae Park 
Cc: 	[5.16.x]
Signed-off-by: Andrew Morton

mm: change to return bool for folio_isolate_lru()

2023-02-20T20:46:17+00:00

Patch series "Change the return value for page isolation functions", v3.

Now the page isolation functions did not return a boolean to indicate
success or not, instead it will return a negative error when failed
to isolate a page. So below code used in most places seem a boolean
success/failure thing, which can confuse people whether the isolation
is successful.

if (folio_isolate_lru(folio))
        continue;

Moreover the page isolation functions only return 0 or -EBUSY, and
most users did not care about the negative error except for few users,
thus we can convert all page isolation functions to return a boolean
value, which can remove the confusion to make code more clear.

No functional changes intended in this patch series.


This patch (of 4):

Now the folio_isolate_lru() did not return a boolean value to indicate
isolation success or not, however below code checking the return value can
make people think that it was a boolean success/failure thing, which makes
people easy to make mistakes (see the fix patch[1]).

if (folio_isolate_lru(folio))
	continue;

Thus it's better to check the negative error value expilictly returned by
folio_isolate_lru(), which makes code more clear per Linus's
suggestion[2].  Moreover Matthew suggested we can convert the isolation
functions to return a boolean[3], since most users did not care about the
negative error value, and can also remove the confusing of checking return
value.

So this patch converts the folio_isolate_lru() to return a boolean value,
which means return 'true' to indicate the folio isolation is successful,
and 'false' means a failure to isolation.  Meanwhile changing all users'
logic of checking the isolation state.

No functional changes intended.

[1] https://lore.kernel.org/all/20230131063206.28820-1-Kuan-Ying.Lee@mediatek.com/T/#u
[2] https://lore.kernel.org/all/CAHk-=wiBrY+O-4=2mrbVyxR+hOqfdJ=Do6xoucfJ9_5az01L4Q@mail.gmail.com/
[3] https://lore.kernel.org/all/Y+sTFqwMNAjDvxw3@casper.infradead.org/

Link: https://lkml.kernel.org/r/cover.1676424378.git.baolin.wang@linux.alibaba.com
Link: https://lkml.kernel.org/r/8a4e3679ed4196168efadf7ea36c038f2f7d5aa9.1676424378.git.baolin.wang@linux.alibaba.com
Signed-off-by: Baolin Wang 
Reviewed-by: SeongJae Park 
Acked-by: David Hildenbrand 
Reviewed-by: Matthew Wilcox (Oracle) 
Acked-by: Linus Torvalds 
Cc: Johannes Weiner 
Cc: Miaohe Lin 
Cc: Michal Hocko 
Cc: Mike Kravetz 
Cc: Muchun Song 
Cc: Naoya Horiguchi 
Cc: Oscar Salvador 
Cc: Roman Gushchin 
Cc: Shakeel Butt 

Signed-off-by: Andrew Morton

mm/damon/dbgfs: print DAMON debugfs interface deprecation message

2023-02-13T23:54:33+00:00

DAMON debugfs interface has announced to be deprecated after >v5.15 LTS
kernel is released.  And, v6.1.y has announced to be an LTS[1].

Though the announcement was there for a while, some people might not
noticed that so far.  Also, some users could depend on it and have
problems at  movng to the alternative (DAMON sysfs interface).

For such cases, warn DAMON debugfs interface deprecation with contacts
to ask helps when any DAMON debugfs interface file is opened.

[1] https://git.kernel.org/pub/scm/docs/kernel/website.git/commit/?id=332e9121320bc7461b2d3a79665caf153e51732c

[sj@kernel.org: split DAMON debugfs file open warning message, per Randy]
  Link: https://lkml.kernel.org/r/20230209192009.7885-4-sj@kernel.org
  Link: https://lkml.kernel.org/r/20230210044838.63723-4-sj@kernel.org
Link: https://lkml.kernel.org/r/20230209192009.7885-4-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: Jonathan Corbet 
Signed-off-by: Andrew Morton

mm/damon/Kconfig: add DAMON debugfs interface deprecation notice

2023-02-13T23:54:32+00:00

DAMON debugfs interface has announced to be deprecated after >v5.15 LTS
kernel is released.  And, v6.1.y has announced to be an LTS[1].

Though the announcement was there for a while, some people might not
noticed that so far.  Also, some users could depend on it and have
problems at  movng to the alternative (DAMON sysfs interface).

For such cases, note DAMON debugfs interface as deprecated, and contacts
to ask helps on the Kconfig.

[1] https://git.kernel.org/pub/scm/docs/kernel/website.git/commit/?id=332e9121320bc7461b2d3a79665caf153e51732c

Link: https://lkml.kernel.org/r/20230209192009.7885-3-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: Jonathan Corbet 
Signed-off-by: Andrew Morton

mm/damon/sysfs: make kobj_type structures constant

2023-02-10T00:51:45+00:00

Since commit ee6d3dd4ed48 ("driver core: make kobj_type constant.") the
driver core allows the usage of const struct kobj_type.

Take advantage of this to constify the structure definitions to prevent
modification at runtime.

Link: https://lkml.kernel.org/r/20230207-kobj_type-damon-v1-1-9d4fea6a465b@weissschuh.net
Signed-off-by: Thomas Weißschuh 
Reviewed-by: SeongJae Park 
Signed-off-by: Andrew Morton

mm/damon/vaddr-test.h: stop using vma_mas_store() for maple tree store

2023-02-10T00:51:35+00:00

Prepare for the removal of the vma_mas_store() function by open coding the
maple tree store in this test code.  Set the range of the maple state and
call the store function directly.

Link: https://lkml.kernel.org/r/20230120162650.984577-31-Liam.Howlett@oracle.com
Signed-off-by: Liam R. Howlett 
Reported-by: kernel test robot 
Reviewed-by: SeongJae Park 
Signed-off-by: Andrew Morton

mm/damon/core-test: add a test for damon_update_monitoring_results()

2023-02-03T06:33:26+00:00

Add a simple unit test for damon_update_monitoring_results() function.

Link: https://lkml.kernel.org/r/20230119013831.1911-4-sj@kernel.org
Signed-off-by: SeongJae Park 
Cc: Brendan Higgins 
Signed-off-by: Andrew Morton