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1f70367f7b
damon_sample_wsse is assuming DAMON is ready to use in module_init time, and uses its own hack to see if it is the time. Use damon_initialized(), which is a way for seeing if DAMON is ready to be used that is more reliable and better to maintain instead of the hack. Link: https://lkml.kernel.org/r/20250916033511.116366-6-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
150 lines
2.9 KiB
C
150 lines
2.9 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* working set size estimation: monitor access pattern of given process and
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* print estimated working set size (total size of regions that showing some
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* access).
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*/
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#define pr_fmt(fmt) "damon_sample_wsse: " 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_wsse."
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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_wsse_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_wsse_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_WSSE");
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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_wsse_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_wsse_repeat_call_fn,
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.repeat = true,
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};
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static int damon_sample_wsse_start(void)
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{
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struct damon_target *target;
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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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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_wsse_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 int damon_sample_wsse_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 (!damon_initialized())
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return 0;
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if (enabled) {
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err = damon_sample_wsse_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_wsse_stop();
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return 0;
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}
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static int __init damon_sample_wsse_init(void)
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{
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int err = 0;
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if (!damon_initialized()) {
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err = -ENOMEM;
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if (enabled)
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enabled = false;
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}
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if (enabled) {
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err = damon_sample_wsse_start();
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if (err)
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enabled = false;
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}
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return err;
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}
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module_init(damon_sample_wsse_init);
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