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Fri, 20 Jun 2025 11:06:16 -0700 (PDT) From: Bijan Tabatabai To: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org Cc: sj@kernel.org, akpm@linux-foundation.org, david@redhat.com, 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 Subject: [RFC PATCH v2 1/2] mm/mempolicy: Expose get_il_weight() to MM Date: Fri, 20 Jun 2025 13:04:57 -0500 Message-ID: <20250620180458.5041-2-bijan311@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20250620180458.5041-1-bijan311@gmail.com> References: <20250620180458.5041-1-bijan311@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Bijan Tabatabai This patch exposes get_il_weight() in mm/internal.h. This patch is to allow other parts of the MM subsystem, such as DAMON, to make page placement decisions based on the global interleave weights. Signed-off-by: Bijan Tabatabai Reviewed-by: Gregory Price Reviewed-by: Huang Ying --- mm/internal.h | 6 ++++++ mm/mempolicy.c | 2 +- 2 files changed, 7 insertions(+), 1 deletion(-) diff --git a/mm/internal.h b/mm/internal.h index 3823fb356d3b..b718ebe7cad5 100644 --- a/mm/internal.h +++ b/mm/internal.h @@ -1169,6 +1169,7 @@ extern int node_reclaim_mode; =20 extern int node_reclaim(struct pglist_data *, gfp_t, unsigned int); extern int find_next_best_node(int node, nodemask_t *used_node_mask); +extern u8 get_il_weight(int node); #else #define node_reclaim_mode 0 =20 @@ -1181,6 +1182,11 @@ static inline int find_next_best_node(int node, node= mask_t *used_node_mask) { return NUMA_NO_NODE; } + +static inline u8 get_il_weight(int node) +{ + return 1; +} #endif =20 static inline bool node_reclaim_enabled(void) diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 1ff7b2174eb7..b1713430ee9c 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -165,7 +165,7 @@ static unsigned int *node_bw_table; */ static DEFINE_MUTEX(wi_state_lock); =20 -static u8 get_il_weight(int node) +u8 get_il_weight(int node) { struct weighted_interleave_state *state; u8 weight =3D 1; --=20 2.43.5