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ff01aba6e4
Implement cleanup_target() callback for [f]vaddr, which calls put_pid() for each target that will be destroyed. Also remove redundant put_pid() calls in core, sysfs and sample modules, which were required to be done redundantly due to the lack of such self cleanup in vaddr. Link: https://lkml.kernel.org/r/20250712195016.151108-11-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
163 lines
3.2 KiB
C
163 lines
3.2 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* proactive reclamation: monitor access pattern of a given process, find
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* regions that seems not accessed, and proactively page out the regions.
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*/
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#define pr_fmt(fmt) "damon_sample_prcl: " fmt
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#include <linux/damon.h>
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#include <linux/init.h>
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#include <linux/kernel.h>
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#include <linux/module.h>
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#ifdef MODULE_PARAM_PREFIX
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#undef MODULE_PARAM_PREFIX
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#endif
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#define MODULE_PARAM_PREFIX "damon_sample_prcl."
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static int target_pid __read_mostly;
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module_param(target_pid, int, 0600);
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static int damon_sample_prcl_enable_store(
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const char *val, const struct kernel_param *kp);
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static const struct kernel_param_ops enabled_param_ops = {
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.set = damon_sample_prcl_enable_store,
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.get = param_get_bool,
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};
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static bool enabled __read_mostly;
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module_param_cb(enabled, &enabled_param_ops, &enabled, 0600);
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MODULE_PARM_DESC(enabled, "Enable or disable DAMON_SAMPLE_PRCL");
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static struct damon_ctx *ctx;
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static struct pid *target_pidp;
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static int damon_sample_prcl_repeat_call_fn(void *data)
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{
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struct damon_ctx *c = data;
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struct damon_target *t;
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damon_for_each_target(t, c) {
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struct damon_region *r;
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unsigned long wss = 0;
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damon_for_each_region(r, t) {
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if (r->nr_accesses > 0)
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wss += r->ar.end - r->ar.start;
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}
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pr_info("wss: %lu\n", wss);
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}
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return 0;
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}
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static struct damon_call_control repeat_call_control = {
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.fn = damon_sample_prcl_repeat_call_fn,
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.repeat = true,
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};
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static int damon_sample_prcl_start(void)
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{
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struct damon_target *target;
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struct damos *scheme;
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int err;
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pr_info("start\n");
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ctx = damon_new_ctx();
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if (!ctx)
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return -ENOMEM;
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if (damon_select_ops(ctx, DAMON_OPS_VADDR)) {
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damon_destroy_ctx(ctx);
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return -EINVAL;
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}
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target = damon_new_target();
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if (!target) {
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damon_destroy_ctx(ctx);
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return -ENOMEM;
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}
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damon_add_target(ctx, target);
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target_pidp = find_get_pid(target_pid);
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if (!target_pidp) {
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damon_destroy_ctx(ctx);
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return -EINVAL;
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}
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target->pid = target_pidp;
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scheme = damon_new_scheme(
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&(struct damos_access_pattern) {
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.min_sz_region = PAGE_SIZE,
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.max_sz_region = ULONG_MAX,
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.min_nr_accesses = 0,
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.max_nr_accesses = 0,
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.min_age_region = 50,
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.max_age_region = UINT_MAX},
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DAMOS_PAGEOUT,
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0,
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&(struct damos_quota){},
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&(struct damos_watermarks){},
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NUMA_NO_NODE);
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if (!scheme) {
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damon_destroy_ctx(ctx);
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return -ENOMEM;
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}
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damon_set_schemes(ctx, &scheme, 1);
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err = damon_start(&ctx, 1, true);
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if (err)
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return err;
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repeat_call_control.data = ctx;
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return damon_call(ctx, &repeat_call_control);
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}
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static void damon_sample_prcl_stop(void)
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{
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pr_info("stop\n");
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if (ctx) {
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damon_stop(&ctx, 1);
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damon_destroy_ctx(ctx);
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}
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}
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static bool init_called;
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static int damon_sample_prcl_enable_store(
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const char *val, const struct kernel_param *kp)
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{
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bool is_enabled = enabled;
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int err;
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err = kstrtobool(val, &enabled);
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if (err)
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return err;
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if (enabled == is_enabled)
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return 0;
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if (enabled) {
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err = damon_sample_prcl_start();
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if (err)
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enabled = false;
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return err;
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}
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damon_sample_prcl_stop();
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return 0;
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}
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static int __init damon_sample_prcl_init(void)
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{
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int err = 0;
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init_called = true;
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if (enabled) {
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err = damon_sample_prcl_start();
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if (err)
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enabled = false;
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}
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return 0;
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}
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module_init(damon_sample_prcl_init);
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