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Author SHA1 Message Date
Christophe JAILLET
e6aff38b2e mm/damon: use kstrtobool() instead of strtobool() 
strtobool() is the same as kstrtobool().  However, the latter is more used
within the kernel.

In order to remove strtobool() and slightly simplify kstrtox.h, switch to
the other function name.

While at it, include the corresponding header file (<linux/kstrtox.h>)

Link: https://lkml.kernel.org/r/ed2b46489a513988688decb53850339cc228940c.1667336095.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-11-30 15:58:45 -08:00
SeongJae Park
7a034fbba3 mm/damon/lru_sort: enable and disable synchronously 
Writing a value to DAMON_RECLAIM's 'enabled' parameter turns on or off
DAMON in an ansychronous way.  This means the parameter cannot be used to
read the current status of DAMON_RECLAIM.  'kdamond_pid' parameter should
be used instead for the purpose.  The documentation is easy to be read as
it works in a synchronous way, so it is a little bit confusing.  It also
makes the user space tooling dirty.

There's no real reason to have the asynchronous behavior, though.  Simply
make the parameter works synchronously, rather than updating the document.

Link: https://lkml.kernel.org/r/20221025173650.90624-4-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Shuah Khan <shuah@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-11-30 15:01:27 -08:00
SeongJae Park
b0d3dbd1b9 mm/damon/{reclaim,lru_sort}: remove unnecessarily included headers 
Some headers that 'reclaim.c' and 'lru_sort.c' are including are
unnecessary now owing to previous cleanups and refactorings.  Remove
those.

Link: https://lkml.kernel.org/r/20221026225943.100429-13-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-11-30 15:01:26 -08:00
SeongJae Park
7ae2c17f53 mm/damon/modules: deduplicate init steps for DAMON context setup 
DAMON_RECLAIM and DAMON_LRU_SORT has duplicated code for DAMON context and
target initializations.  Deduplicate the part by implementing a function
for the initialization in 'modules-common.c' and using it.

Link: https://lkml.kernel.org/r/20221026225943.100429-12-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-11-30 15:01:26 -08:00
Kaixu Xia
233f0b31bd mm/damon: deduplicate damon_{reclaim,lru_sort}_apply_parameters() 
The bodies of damon_{reclaim,lru_sort}_apply_parameters() contain
duplicates.  This commit adds a common function
damon_set_region_biggest_system_ram_default() to remove the duplicates.

Link: https://lkml.kernel.org/r/6329f00d.a70a0220.9bb29.3678SMTPIN_ADDED_BROKEN@mx.google.com
Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Suggested-by: SeongJae Park <sj@kernel.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:31 -07:00
Kaixu Xia
cc713520bd mm/damon: return void from damon_set_schemes() 
There is no point in returning an int from damon_set_schemes().  It always
returns 0 which is meaningless for the caller, so change it to return void
directly.

Link: https://lkml.kernel.org/r/1663341635-12675-1-git-send-email-kaixuxia@tencent.com
Signed-off-by: Kaixu Xia <kaixuxia@tencent.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Muchun Song <songmuchun@bytedance.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:27 -07:00
Yang Yingliang
e47b082579 mm/damon/lru_sort: change damon_lru_sort_wmarks to static 
damon_lru_sort_wmarks is only used in lru_sort.c now, change it to static.

Link: https://lkml.kernel.org/r/20220915021024.4177940-2-yangyingliang@huawei.com
Fixes: 189aa3d58206 ("mm/damon/lru_sort: use watermarks parameters generator macro")
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:27 -07:00
Xin Hao
a07b8eafa4 mm/damon: simplify scheme create in lru_sort.c 
In damon_lru_sort_new_hot_scheme() and damon_lru_sort_new_cold_scheme(),
they have so much in common, so we can combine them into a single
function, and we just need to distinguish their differences.

[yangyingliang@huawei.com: change damon_lru_sort_stub_pattern to static]
  Link: https://lkml.kernel.org/r/20220917121228.1889699-1-yangyingliang@huawei.com
Link: https://lkml.kernel.org/r/20220915133041.71819-1-sj@kernel.org
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Yang Yingliang <yangyingliang@huawei.com>
Suggested-by: SeongJae Park <sj@kernel.org>
Reviewed-by: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:26 -07:00
SeongJae Park
a62518ab1d mm/damon/lru_sort: deduplicate hot/cold schemes generators 
damon_lru_sort_new_{hot,cold}_scheme() have quite a lot of duplicates. 
This commit factors out the duplicate to a separate function and use it
for reducing the duplicate.

Link: https://lkml.kernel.org/r/20220913174449.50645-23-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:13 -07:00
SeongJae Park
45b8212fc5 mm/damon/lru_sort: use quotas param generator 
This commit makes DAMON_LRU_SORT to generate the module parameters for
DAMOS watermarks using the generator macro to simplify the code and reduce
duplicates.

Link: https://lkml.kernel.org/r/20220913174449.50645-22-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:13 -07:00
SeongJae Park
dd172fbf8f mm/damon/lru_sort: use stat generator 
This commit makes DAMON_LRU_SORT to generate the module parameters for
DAMOS statistics using the generator macro to simplify the code and reduce
duplicates.

Link: https://lkml.kernel.org/r/20220913174449.50645-18-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:12 -07:00
SeongJae Park
6517d2d977 mm/damon/lru_sort: use watermarks parameters generator macro 
This commit makes DAMON_LRU_SORT to generate the module parameters for
DAMOS watermarks using the generator macro to simplify the code and reduce
duplicates.

Link: https://lkml.kernel.org/r/20220913174449.50645-14-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:12 -07:00
SeongJae Park
95f7c05d73 mm/damon/lru_sort: use monitoring attributes parameters generaotr macro 
This commit makes DAMON_LRU_SORT to generate the module parameters for
DAMON monitoring attributes using the generator macro to simplify the code
and reduce duplicates.

Link: https://lkml.kernel.org/r/20220913174449.50645-11-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:11 -07:00
SeongJae Park
135e128f8e mm/damon/lru_sort: use 'struct damon_attrs' for storing parameters for it 
DAMON_LRU_SORT receives monitoring attributes by parameters one by one to
separate variables, and then combines those into 'struct damon_attrs'. 
This commit makes the module directly stores the parameter values to a
static 'struct damon_attrs' variable and use it to simplify the code.

Link: https://lkml.kernel.org/r/20220913174449.50645-9-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:11 -07:00
SeongJae Park
bead3b0008 mm/damon/core: reduce parameters for damon_set_attrs() 
Number of parameters for 'damon_set_attrs()' is six.  As it could be
confusing and verbose, this commit reduces the number by receiving single
pointer to a 'struct damon_attrs'.

Link: https://lkml.kernel.org/r/20220913174449.50645-7-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:10 -07:00
Xin Hao
3791bc7bf1 mm/damon: simplify scheme create in damon_lru_sort_apply_parameters 
In damon_lru_sort_apply_parameters(), we can use damon_set_schemes() to
replace the way of creating the first 'scheme' in original code, this
makes the code look cleaner.

Link: https://lkml.kernel.org/r/20220911005917.835-1-xhao@linux.alibaba.com
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:09 -07:00
Xin Hao
0d83b2d89d mm/damon: remove duplicate get_monitoring_region() definitions 
In lru_sort.c and reclaim.c, they are all defining get_monitoring_region()
function, there is no need to define it separately.

As 'get_monitoring_region()' is not a 'static' function anymore, we try to
use a prefix to distinguish with other functions, so there rename it to
'damon_find_biggest_system_ram'.

Link: https://lkml.kernel.org/r/20220909213606.136221-1-sj@kernel.org
Signed-off-by: Xin Hao <xhao@linux.alibaba.com>
Signed-off-by: SeongJae Park <sj@kernel.org>
Suggested-by: SeongJae Park <sj@kernel.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:08 -07:00
Yajun Deng
f5a79d7c0c mm/damon: introduce struct damos_access_pattern 
damon_new_scheme() has too many parameters, so introduce struct
damos_access_pattern to simplify it.

In additon, we can't use a bpf trace kprobe that has more than 5
parameters.

Link: https://lkml.kernel.org/r/20220908191443.129534-1-sj@kernel.org
Signed-off-by: Yajun Deng <yajun.deng@linux.dev>
Signed-off-by: SeongJae Park <sj@kernel.org>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-10-03 14:03:05 -07:00
SeongJae Park
ec1658f0f9 mm/damon/lru_sort: fix potential memory leak in damon_lru_sort_init() 
damon_lru_sort_init() returns an error when damon_select_ops() fails
without freeing 'ctx' which allocated before.  This commit fixes the
potential memory leak by freeing 'ctx' under the situation.

Link: https://lkml.kernel.org/r/20220714170458.49727-1-sj@kernel.org
Fixes: 40e983cca9 ("mm/damon: introduce DAMON-based LRU-lists Sorting")
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-07-17 17:14:27 -07:00
SeongJae Park
40e983cca9 mm/damon: introduce DAMON-based LRU-lists Sorting 
Users can do data access-aware LRU-lists sorting using 'LRU_PRIO' and
'LRU_DEPRIO' DAMOS actions.  However, finding best parameters including
the hotness/coldness thresholds, CPU quota, and watermarks could be
challenging for some users.  To make the scheme easy to be used without
complex tuning for common situations, this commit implements a static
kernel module called 'DAMON_LRU_SORT' using the 'LRU_PRIO' and
'LRU_DEPRIO' DAMOS actions.

It proactively sorts LRU-lists using DAMON with conservatively chosen
default values of the parameters.  That is, the module under its default
parameters will make no harm for common situations but provide some level
of efficiency improvements for systems having clear hot/cold access
pattern under a level of memory pressure while consuming only a limited
small portion of CPU time.

Link: https://lkml.kernel.org/r/20220613192301.8817-9-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Cc: Jonathan Corbet <corbet@lwn.net>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
 2022-07-03 18:08:43 -07:00