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Message-Id: <20241113162624.48973-5-sj@kernel.org>
Date: Wed, 13 Nov 2024 08:26:23 -0800
From: SeongJae Park <sj@...nel.org>
To:
Cc: SeongJae Park <sj@...nel.org>,
damon@...ts.linux.dev,
linux-mm@...ck.org,
linux-kernel@...r.kernel.org,
kernel-team@...a.com
Subject: [RFC PATCH 4/5] samples/damon: introduce a skeleton of a smaple DAMON module for proactive reclamation
Add a skeleton for a sample DAMON module that can be used for
proactively reclaiming cold memory regions of a given process. The
skeleton is actually same to working set size estimation sample module,
but only the names of the file and symbols are changed.
Signed-off-by: SeongJae Park <sj@...nel.org>
---
samples/Makefile | 1 +
samples/damon/Kconfig | 13 +++++
samples/damon/Makefile | 1 +
samples/damon/prcl.c | 120 +++++++++++++++++++++++++++++++++++++++++
4 files changed, 135 insertions(+)
create mode 100644 samples/damon/prcl.c
diff --git a/samples/Makefile b/samples/Makefile
index 726bb5293486..5af6bb8afb07 100644
--- a/samples/Makefile
+++ b/samples/Makefile
@@ -40,3 +40,4 @@ obj-$(CONFIG_SAMPLE_CORESIGHT_SYSCFG) += coresight/
obj-$(CONFIG_SAMPLE_FPROBE) += fprobe/
obj-$(CONFIG_SAMPLES_RUST) += rust/
obj-$(CONFIG_SAMPLE_DAMON_WSSE) += damon/
+obj-$(CONFIG_SAMPLE_DAMON_PRCL) += damon/
diff --git a/samples/damon/Kconfig b/samples/damon/Kconfig
index b799e01345c8..63f6dcd71daa 100644
--- a/samples/damon/Kconfig
+++ b/samples/damon/Kconfig
@@ -14,4 +14,17 @@ config SAMPLE_DAMON_WSSE
If unsure, say N.
+config SAMPLE_DAMON_PRCL
+ bool "DAMON sameple module for access-aware proactive reclamation"
+ depends on DAMON && DAMON_VADDR
+ help
+ This builds DAMON sample module for access-aware proactive
+ reclamation.
+
+ The module receives a pid, monitor access to the virtual address
+ space of the process, find memory regions that not accessed, and
+ proactively reclaim the regions.
+
+ If unsure, say N.
+
endmenu
diff --git a/samples/damon/Makefile b/samples/damon/Makefile
index ccbe93d40130..7f155143f237 100644
--- a/samples/damon/Makefile
+++ b/samples/damon/Makefile
@@ -1,3 +1,4 @@
# SPDX-License-Identifier: GPL-2.0
obj-$(CONFIG_SAMPLE_DAMON_WSSE) += wsse.o
+obj-$(CONFIG_SAMPLE_DAMON_PRCL) += prcl.o
diff --git a/samples/damon/prcl.c b/samples/damon/prcl.c
new file mode 100644
index 000000000000..32ccdd91cf55
--- /dev/null
+++ b/samples/damon/prcl.c
@@ -0,0 +1,120 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * proactive reclamation: monitor access pattern of a given process, find
+ * regiosn that seems not accessed, and proactively page out the regions.
+ */
+
+#define pr_fmt(fmt) "damon_sample_prcl: " fmt
+
+#include <linux/damon.h>
+#include <linux/init.h>
+#include <linux/kernel.h>
+#include <linux/module.h>
+
+static int target_pid __read_mostly;
+module_param(target_pid, int, 0600);
+
+static int damon_sample_prcl_enable_store(
+ const char *val, const struct kernel_param *kp);
+
+static const struct kernel_param_ops enable_param_ops = {
+ .set = damon_sample_prcl_enable_store,
+ .get = param_get_bool,
+};
+
+static bool enable __read_mostly;
+module_param_cb(enable, &enable_param_ops, &enable, 0600);
+MODULE_PARM_DESC(enable, "Enable of disable DAMON_SAMPLE_WSSE");
+
+static struct damon_ctx *ctx;
+static struct pid *target_pidp;
+
+static int damon_sample_prcl_after_aggregate(struct damon_ctx *c)
+{
+ struct damon_target *t;
+
+ damon_for_each_target(t, c) {
+ struct damon_region *r;
+ unsigned long wss = 0;
+
+ damon_for_each_region(r, t) {
+ if (r->nr_accesses > 0)
+ wss += r->ar.end - r->ar.start;
+ }
+ pr_info("wss: %lu\n", wss);
+ }
+ return 0;
+}
+
+static int damon_sample_prcl_start(void)
+{
+ struct damon_target *target;
+
+ pr_info("start\n");
+
+ ctx = damon_new_ctx();
+ if (!ctx)
+ return -ENOMEM;
+ if (damon_select_ops(ctx, DAMON_OPS_VADDR)) {
+ damon_destroy_ctx(ctx);
+ return -EINVAL;
+ }
+
+ target = damon_new_target();
+ if (!target) {
+ damon_destroy_ctx(ctx);
+ return -ENOMEM;
+ }
+ damon_add_target(ctx, target);
+ target_pidp = find_get_pid(target_pid);
+ if (!target_pidp) {
+ damon_destroy_ctx(ctx);
+ return -EINVAL;
+ }
+ target->pid = target_pidp;
+
+ ctx->callback.after_aggregation = damon_sample_prcl_after_aggregate;
+
+ return damon_start(&ctx, 1, true);
+}
+
+static void damon_sample_prcl_stop(void)
+{
+ pr_info("stop\n");
+ if (ctx) {
+ damon_stop(&ctx, 1);
+ damon_destroy_ctx(ctx);
+ }
+ if (target_pidp)
+ put_pid(target_pidp);
+}
+
+static int damon_sample_prcl_enable_store(
+ const char *val, const struct kernel_param *kp)
+{
+ bool enabled = enable;
+ int err;
+
+ err = kstrtobool(val, &enable);
+ if (err)
+ return err;
+
+ if (enable == enabled)
+ return 0;
+
+ if (enable)
+ return damon_sample_prcl_start();
+ damon_sample_prcl_stop();
+ return 0;
+}
+
+static int __init damon_sample_prcl_init(void)
+{
+ return 0;
+}
+
+module_init(damon_sample_prcl_init);
+
+MODULE_LICENSE("GPL");
+MODULE_AUTHOR("SeongJae Park");
+MODULE_DESCRIPTION("DAMON sample module for proactive reclamation");
--
2.39.5
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