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samples/damon/wsse: start and stop DAMON as the user requests

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Start running DAMON to monitor accesses of a process that the user
specified via 'target_pid' parameter, when 'y' is passed to 'enable'
parameter.  Stop running DAMON when 'n' is passed to 'enable' parameter. 
Estimating the working set size from DAMON's monitoring results and
reporting it to the user will be implemented by the following commit.

Link: https://lkml.kernel.org/r/20241210215030.85675-3-sj@kernel.org
Signed-off-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
SeongJae Park 2024-12-10 13:50:27 -08:00 committed by Andrew Morton
parent a307d7da1a
commit d452d76f63
1 changed files with 34 additions and 1 deletions
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35
samples/damon/wsse.c
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@ -27,15 +27,48 @@ static bool enable __read_mostly;
module_param_cb(enable, &enable_param_ops, &enable, 0600);
MODULE_PARM_DESC(enable, "Enable or disable DAMON_SAMPLE_WSSE");
static struct damon_ctx *ctx;
static struct pid *target_pidp;
static int damon_sample_wsse_start(void)
{
struct damon_target *target;
pr_info("start\n");
return 0;
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;
return damon_start(&ctx, 1, true);
}
static void damon_sample_wsse_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_wsse_enable_store(