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Message-Id: <20240512175447.75943-3-sj@kernel.org>
Date: Sun, 12 May 2024 10:54:44 -0700
From: SeongJae Park <sj@...nel.org>
To:
Cc: Hyeongtak Ji <hyeongtak.ji@...com>,
SeongJae Park <sj@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
damon@...ts.linux.dev,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
Honggyu Kim <honggyu.kim@...com>
Subject: [RFC PATCH v4 2/5] mm/damon/sysfs-schemes: add target_nid on sysfs-schemes
From: Hyeongtak Ji <hyeongtak.ji@...com>
This patch adds target_nid under
/sys/kernel/mm/damon/admin/kdamonds/<N>/contexts/<N>/schemes/<N>/
The 'target_nid' can be used as the destination node for DAMOS actions
such as DAMOS_MIGRATE_{HOT,COLD} in the follow up patches.
Signed-off-by: Hyeongtak Ji <hyeongtak.ji@...com>
Signed-off-by: Honggyu Kim <honggyu.kim@...com>
Signed-off-by: SeongJae Park <sj@...nel.org>
---
include/linux/damon.h | 11 ++++++++++-
mm/damon/core.c | 5 ++++-
mm/damon/dbgfs.c | 2 +-
mm/damon/lru_sort.c | 3 ++-
mm/damon/reclaim.c | 3 ++-
mm/damon/sysfs-schemes.c | 33 ++++++++++++++++++++++++++++++++-
6 files changed, 51 insertions(+), 6 deletions(-)
diff --git a/include/linux/damon.h b/include/linux/damon.h
index f7da65e1ac04..21d6b69a015c 100644
--- a/include/linux/damon.h
+++ b/include/linux/damon.h
@@ -374,6 +374,7 @@ struct damos_access_pattern {
* @apply_interval_us: The time between applying the @action.
* @quota: Control the aggressiveness of this scheme.
* @wmarks: Watermarks for automated (in)activation of this scheme.
+ * @target_nid: Destination node if @action is "migrate_{hot,cold}".
* @filters: Additional set of &struct damos_filter for &action.
* @stat: Statistics of this scheme.
* @list: List head for siblings.
@@ -389,6 +390,10 @@ struct damos_access_pattern {
* monitoring context are inactive, DAMON stops monitoring either, and just
* repeatedly checks the watermarks.
*
+ * @target_nid is used to set the migration target node for migrate_hot or
+ * migrate_cold actions, which means it's only meaningful when @action is either
+ * "migrate_hot" or "migrate_cold".
+ *
* Before applying the &action to a memory region, &struct damon_operations
* implementation could check pages of the region and skip &action to respect
* &filters
@@ -410,6 +415,9 @@ struct damos {
/* public: */
struct damos_quota quota;
struct damos_watermarks wmarks;
+ union {
+ int target_nid;
+ };
struct list_head filters;
struct damos_stat stat;
struct list_head list;
@@ -726,7 +734,8 @@ struct damos *damon_new_scheme(struct damos_access_pattern *pattern,
enum damos_action action,
unsigned long apply_interval_us,
struct damos_quota *quota,
- struct damos_watermarks *wmarks);
+ struct damos_watermarks *wmarks,
+ int target_nid);
void damon_add_scheme(struct damon_ctx *ctx, struct damos *s);
void damon_destroy_scheme(struct damos *s);
diff --git a/mm/damon/core.c b/mm/damon/core.c
index e1a0c2a11007..32c261aeff88 100644
--- a/mm/damon/core.c
+++ b/mm/damon/core.c
@@ -364,7 +364,8 @@ struct damos *damon_new_scheme(struct damos_access_pattern *pattern,
enum damos_action action,
unsigned long apply_interval_us,
struct damos_quota *quota,
- struct damos_watermarks *wmarks)
+ struct damos_watermarks *wmarks,
+ int target_nid)
{
struct damos *scheme;
@@ -391,6 +392,8 @@ struct damos *damon_new_scheme(struct damos_access_pattern *pattern,
scheme->wmarks = *wmarks;
scheme->wmarks.activated = true;
+ scheme->target_nid = target_nid;
+
return scheme;
}
diff --git a/mm/damon/dbgfs.c b/mm/damon/dbgfs.c
index 2461cfe2e968..51a6f1cac385 100644
--- a/mm/damon/dbgfs.c
+++ b/mm/damon/dbgfs.c
@@ -281,7 +281,7 @@ static struct damos **str_to_schemes(const char *str, ssize_t len,
pos += parsed;
scheme = damon_new_scheme(&pattern, action, 0, "a,
- &wmarks);
+ &wmarks, NUMA_NO_NODE);
if (!scheme)
goto fail;
diff --git a/mm/damon/lru_sort.c b/mm/damon/lru_sort.c
index 3de2916a65c3..3775f0f2743d 100644
--- a/mm/damon/lru_sort.c
+++ b/mm/damon/lru_sort.c
@@ -163,7 +163,8 @@ static struct damos *damon_lru_sort_new_scheme(
/* under the quota. */
"a,
/* (De)activate this according to the watermarks. */
- &damon_lru_sort_wmarks);
+ &damon_lru_sort_wmarks,
+ NUMA_NO_NODE);
}
/* Create a DAMON-based operation scheme for hot memory regions */
diff --git a/mm/damon/reclaim.c b/mm/damon/reclaim.c
index 9bd341d62b4c..a05ccb41749b 100644
--- a/mm/damon/reclaim.c
+++ b/mm/damon/reclaim.c
@@ -177,7 +177,8 @@ static struct damos *damon_reclaim_new_scheme(void)
/* under the quota. */
&damon_reclaim_quota,
/* (De)activate this according to the watermarks. */
- &damon_reclaim_wmarks);
+ &damon_reclaim_wmarks,
+ NUMA_NO_NODE);
}
static void damon_reclaim_copy_quota_status(struct damos_quota *dst,
diff --git a/mm/damon/sysfs-schemes.c b/mm/damon/sysfs-schemes.c
index bea5bc52846a..0632d28b67f8 100644
--- a/mm/damon/sysfs-schemes.c
+++ b/mm/damon/sysfs-schemes.c
@@ -6,6 +6,7 @@
*/
#include <linux/slab.h>
+#include <linux/numa.h>
#include "sysfs-common.h"
@@ -1445,6 +1446,7 @@ struct damon_sysfs_scheme {
struct damon_sysfs_scheme_filters *filters;
struct damon_sysfs_stats *stats;
struct damon_sysfs_scheme_regions *tried_regions;
+ int target_nid;
};
/* This should match with enum damos_action */
@@ -1470,6 +1472,7 @@ static struct damon_sysfs_scheme *damon_sysfs_scheme_alloc(
scheme->kobj = (struct kobject){};
scheme->action = action;
scheme->apply_interval_us = apply_interval_us;
+ scheme->target_nid = NUMA_NO_NODE;
return scheme;
}
@@ -1692,6 +1695,28 @@ static ssize_t apply_interval_us_store(struct kobject *kobj,
return err ? err : count;
}
+static ssize_t target_nid_show(struct kobject *kobj,
+ struct kobj_attribute *attr, char *buf)
+{
+ struct damon_sysfs_scheme *scheme = container_of(kobj,
+ struct damon_sysfs_scheme, kobj);
+
+ return sysfs_emit(buf, "%d\n", scheme->target_nid);
+}
+
+static ssize_t target_nid_store(struct kobject *kobj,
+ struct kobj_attribute *attr, const char *buf, size_t count)
+{
+ struct damon_sysfs_scheme *scheme = container_of(kobj,
+ struct damon_sysfs_scheme, kobj);
+ int err = 0;
+
+ /* TODO: error handling for target_nid range. */
+ err = kstrtoint(buf, 0, &scheme->target_nid);
+
+ return err ? err : count;
+}
+
static void damon_sysfs_scheme_release(struct kobject *kobj)
{
kfree(container_of(kobj, struct damon_sysfs_scheme, kobj));
@@ -1703,9 +1728,13 @@ static struct kobj_attribute damon_sysfs_scheme_action_attr =
static struct kobj_attribute damon_sysfs_scheme_apply_interval_us_attr =
__ATTR_RW_MODE(apply_interval_us, 0600);
+static struct kobj_attribute damon_sysfs_scheme_target_nid_attr =
+ __ATTR_RW_MODE(target_nid, 0600);
+
static struct attribute *damon_sysfs_scheme_attrs[] = {
&damon_sysfs_scheme_action_attr.attr,
&damon_sysfs_scheme_apply_interval_us_attr.attr,
+ &damon_sysfs_scheme_target_nid_attr.attr,
NULL,
};
ATTRIBUTE_GROUPS(damon_sysfs_scheme);
@@ -2031,7 +2060,8 @@ static struct damos *damon_sysfs_mk_scheme(
};
scheme = damon_new_scheme(&pattern, sysfs_scheme->action,
- sysfs_scheme->apply_interval_us, "a, &wmarks);
+ sysfs_scheme->apply_interval_us, "a, &wmarks,
+ sysfs_scheme->target_nid);
if (!scheme)
return NULL;
@@ -2068,6 +2098,7 @@ static void damon_sysfs_update_scheme(struct damos *scheme,
scheme->action = sysfs_scheme->action;
scheme->apply_interval_us = sysfs_scheme->apply_interval_us;
+ scheme->target_nid = sysfs_scheme->target_nid;
scheme->quota.ms = sysfs_quotas->ms;
scheme->quota.sz = sysfs_quotas->sz;
--
2.39.2
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