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[2003:d8:2f1a:3700:2982:b5f7:a04e:4cb4]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-4532e13d014sm53347475e9.24.2025.06.13.06.43.45 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Fri, 13 Jun 2025 06:43:47 -0700 (PDT) Message-ID: <67e225d5-f512-4e90-9211-6cd04b22558f@redhat.com> Date: Fri, 13 Jun 2025 15:43:44 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC PATCH 2/4] mm/damon/paddr: Add DAMOS_INTERLEAVE action To: Bijan Tabatabai , damon@lists.linux.com, linux-mm@kvack.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org Cc: sj@kernel.org, akpm@linux-foundation.org, corbet@lwn.net, ziy@nvidia.com, matthew.brost@intel.com, joshua.hahnjy@gmail.com, rakie.kim@sk.com, byungchul@sk.com, gourry@gourry.net, ying.huang@linux.alibaba.com, apopple@nvidia.com, bijantabatab@micron.com, venkataravis@micron.com, emirakhur@micron.com, ajayjoshi@micron.com, vtavarespetr@micron.com References: <20250612181330.31236-1-bijan311@gmail.com> <20250612181330.31236-3-bijan311@gmail.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 1EFAAA0008 X-Rspamd-Server: rspam03 X-Rspam-User: X-Stat-Signature: ddhy13xku1zispdpmpe6p9odyok3gzpi X-HE-Tag: 1749822230-578179 X-HE-Meta: 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 azbkjPFS 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 12.06.25 20:13, Bijan Tabatabai wrote: > From: Bijan Tabatabai > > This patch adds the DAMOS_INTERLEAVE action. > It interleaves pages inside of a given region according to the weights > in the iw_table. To reuse existing interleaving code, the target nid for > a folio is determined by calling policy_nodemask, therefore only folios > belonging to processes using the MPOL_WEIGHTED_INTERLEAVE policy will > have their pages migrated. > > Below is an example of its usage where pages are initially interleaved at > a 1:1 ratio and then changed to be interleaved at a 2:1 ratio. The > alloc_data program simply allocates 1GB of data then sleeps. > $ cd /sys/kernel/mm/damon/admin/kdamonds/0 > $ sudo cat ./contexts/0/schemes/0/action > interleave > $ echo 1 | sudo tee /sys/kernel/mm/mempolicy/weighted_interleave/node0 > $ echo 1 | sudo tee /sys/kernel/mm/mempolicy/weighted_interleave/node1 > $ numactl -w 0,1 ~/alloc_data 1G & > $ numastat -c -p alloc_data > > Per-node process memory usage (in MBs) for PID 18473 (alloc_data) > Node 0 Node 1 Total > ------ ------ ----- > Huge 0 0 0 > Heap 0 0 0 > Stack 0 0 0 > Private 514 514 1027 > ------- ------ ------ ----- > Total 514 514 1028 > $ echo 2 | sudo tee /sys/kernel/mm/mempolicy/weighted_interleave/node0 > $ numastat -c -p alloc_data > > Per-node process memory usage (in MBs) for PID 18473 (alloc_data) > Node 0 Node 1 Total > ------ ------ ----- > Huge 0 0 0 > Heap 0 0 0 > Stack 0 0 0 > Private 684 343 1027 > ------- ------ ------ ----- > Total 684 343 1027 > > Signed-off-by: Bijan Tabatabai > --- > Documentation/mm/damon/design.rst | 2 + > include/linux/damon.h | 2 + > mm/damon/paddr.c | 112 ++++++++++++++++++++++++++++++ > mm/damon/sysfs-schemes.c | 1 + > 4 files changed, 117 insertions(+) > > diff --git a/Documentation/mm/damon/design.rst b/Documentation/mm/damon/design.rst > index ddc50db3afa4..c50d2105cea0 100644 > --- a/Documentation/mm/damon/design.rst > +++ b/Documentation/mm/damon/design.rst > @@ -455,6 +455,8 @@ that supports each action are as below. > Supported by ``paddr`` operations set. > - ``migrate_cold``: Migrate the regions prioritizing colder regions. > Supported by ``paddr`` operations set. > + - ``interleave``: Interleave the regions according to the weighted interleave weights. > + Supported by ``paddr`` operations set. > - ``stat``: Do nothing but count the statistics. > Supported by all operations sets. > > diff --git a/include/linux/damon.h b/include/linux/damon.h > index a4011726cb3b..81d26a203337 100644 > --- a/include/linux/damon.h > +++ b/include/linux/damon.h > @@ -117,6 +117,7 @@ struct damon_target { > * @DAMOS_LRU_DEPRIO: Deprioritize the region on its LRU lists. > * @DAMOS_MIGRATE_HOT: Migrate the regions prioritizing warmer regions. > * @DAMOS_MIGRATE_COLD: Migrate the regions prioritizing colder regions. > + * @DAMOS_INTERLEAVE: Interleave the regions by the weighted interleave ratio > * @DAMOS_STAT: Do nothing but count the stat. > * @NR_DAMOS_ACTIONS: Total number of DAMOS actions > * > @@ -136,6 +137,7 @@ enum damos_action { > DAMOS_LRU_DEPRIO, > DAMOS_MIGRATE_HOT, > DAMOS_MIGRATE_COLD, > + DAMOS_INTERLEAVE, > DAMOS_STAT, /* Do nothing but only record the stat */ > NR_DAMOS_ACTIONS, > }; > diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c > index 4102a8c5f992..e989464635cd 100644 > --- a/mm/damon/paddr.c > +++ b/mm/damon/paddr.c > @@ -535,6 +535,114 @@ static unsigned long damon_pa_migrate(struct damon_region *r, struct damos *s, > return applied * PAGE_SIZE; > } > > +#if defined(CONFIG_MEMCG) && defined(CONFIG_NUMA) > +struct damos_interleave_private { > + struct list_head *folio_migration_list; > + bool putback_lru; > +}; > + > +static bool damon_pa_interleave_rmap(struct folio *folio, struct vm_area_struct *vma, > + unsigned long addr, void *arg) > +{ > + struct mempolicy *pol; > + struct task_struct *task; > + pgoff_t ilx; > + int target_nid; > + struct damos_interleave_private *priv = arg; > + > + task = rcu_dereference(vma->vm_mm->owner); > + if (!task) > + return true; > + > + pol = get_task_policy(task); > + if (!pol) > + return true; Why is this not using get_vma_policy(), which will fallback to the task policy in case there is no per-vma policy> -- Cheers, David / dhildenb