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Message-ID: <20251016104717.2194909-1-yanquanmin1@huawei.com>
Date: Thu, 16 Oct 2025 18:47:17 +0800
From: Quanmin Yan <yanquanmin1@...wei.com>
To: <sj@...nel.org>
CC: <akpm@...ux-foundation.org>, <damon@...ts.linux.dev>,
<linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
<yanquanmin1@...wei.com>, <wangkefeng.wang@...wei.com>, <zuoze1@...wei.com>
Subject: [PATCH] mm/damon: add a min_sz_region parameter to damon_set_region_biggest_system_ram_default()
After adding addr_unit support for DAMON_LRU_SORT and DAMON_RECLAIM,
the related region setup now requires alignment based on min_sz_region.
Add min_sz_region to damon_set_region_biggest_system_ram_default()
and use it when calling damon_set_regions(), replacing the previously
hardcoded DAMON_MIN_REGION.
Fixes: 2e0fe9245d6b ("mm/damon/lru_sort: support addr_unit for DAMON_LRU_SORT")
Fixes: 7db551fcfb2a ("mm/damon/reclaim: support addr_unit for DAMON_RECLAIM")
Signed-off-by: Quanmin Yan <yanquanmin1@...wei.com>
---
include/linux/damon.h | 3 ++-
mm/damon/core.c | 6 ++++--
mm/damon/lru_sort.c | 3 ++-
mm/damon/reclaim.c | 3 ++-
mm/damon/stat.c | 3 ++-
5 files changed, 12 insertions(+), 6 deletions(-)
diff --git a/include/linux/damon.h b/include/linux/damon.h
index cae8c613c5fc..1ce75a20febf 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -947,7 +947,8 @@ int damon_call(struct damon_ctx *ctx, struct damon_call_control *control);
int damos_walk(struct damon_ctx *ctx, struct damos_walk_control *control);
int damon_set_region_biggest_system_ram_default(struct damon_target *t,
- unsigned long *start, unsigned long *end);
+ unsigned long *start, unsigned long *end,
+ unsigned long min_sz_region);
#endif /* CONFIG_DAMON */
diff --git a/mm/damon/core.c b/mm/damon/core.c
index 93848b4c6944..e29f08b8a114 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -2767,6 +2767,7 @@ static bool damon_find_biggest_system_ram(unsigned long *start,
* @t: The monitoring target to set the region.
* @start: The pointer to the start address of the region.
* @end: The pointer to the end address of the region.
+ * @min_sz_region: Minimum region size.
*
* This function sets the region of @t as requested by @start and @end. If the
* values of @start and @end are zero, however, this function finds the biggest
@@ -2777,7 +2778,8 @@ static bool damon_find_biggest_system_ram(unsigned long *start,
* Return: 0 on success, negative error code otherwise.
*/
int damon_set_region_biggest_system_ram_default(struct damon_target *t,
- unsigned long *start, unsigned long *end)
+ unsigned long *start, unsigned long *end,
+ unsigned long min_sz_region)
{
struct damon_addr_range addr_range;
@@ -2790,7 +2792,7 @@ int damon_set_region_biggest_system_ram_default(struct damon_target *t,
addr_range.start = *start;
addr_range.end = *end;
- return damon_set_regions(t, &addr_range, 1, DAMON_MIN_REGION);
+ return damon_set_regions(t, &addr_range, 1, min_sz_region);
}
/*
diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c
index 42b9a656f9de..49b4bc294f4e 100644
--- a/mm/damon/lru_sort.c
+++ b/mm/damon/lru_sort.c
@@ -242,7 +242,8 @@ static int damon_lru_sort_apply_parameters(void)
err = damon_set_region_biggest_system_ram_default(param_target,
&monitor_region_start,
- &monitor_region_end);
+ &monitor_region_end,
+ param_ctx->min_sz_region);
if (err)
goto out;
err = damon_commit_ctx(ctx, param_ctx);
diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
index 7ba3d0f9a19a..36a582e09eae 100644
--- a/mm/damon/reclaim.c
+++ b/mm/damon/reclaim.c
@@ -250,7 +250,8 @@ static int damon_reclaim_apply_parameters(void)
err = damon_set_region_biggest_system_ram_default(param_target,
&monitor_region_start,
- &monitor_region_end);
+ &monitor_region_end,
+ param_ctx->min_sz_region);
if (err)
goto out;
err = damon_commit_ctx(ctx, param_ctx);
diff --git a/mm/damon/stat.c b/mm/damon/stat.c
index d8010968bbed..6c4503d2aee3 100644
--- a/mm/damon/stat.c
+++ b/mm/damon/stat.c
@@ -187,7 +187,8 @@ static struct damon_ctx *damon_stat_build_ctx(void)
if (!target)
goto free_out;
damon_add_target(ctx, target);
- if (damon_set_region_biggest_system_ram_default(target, &start, &end))
+ if (damon_set_region_biggest_system_ram_default(target, &start, &end,
+ ctx->min_sz_region))
goto free_out;
return ctx;
free_out:
--
2.43.0
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