[patch 221/262] mm/damon: needn't hold kdamond_lock to print pid of kdamond

Andrew Morton
2021-11-05T20:46:30Z

From: Changbin Du <changbin.du@gmail.com>
Subject: mm/damon: needn't hold kdamond_lock to print pid of kdamond

Just get the pid by 'current->pid'. Meanwhile, to be symmetrical make
the 'starts' and 'finishes' logs both use debug level.

Link: https://lkml.kernel.org/r/20210927232432.17750-1-changbin.du@gmail.com
Signed-off-by: Changbin Du <changbin.du@gmail.com>
Reviewed-by: SeongJae Park <sj@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

mm/damon/core.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)

--- a/mm/damon/core.c~mm-damon-neednt-hold-kdamond_lock-to-print-pid-of-kdamond
+++ a/mm/damon/core.c
@@ -652,9 +652,7 @@ static int kdamond_fn(void *data)
unsigned int max_nr_accesses = 0;
unsigned long sz_limit = 0;

- mutex_lock(&ctx->kdamond_lock);
- pr_debug("kdamond (%d) starts\n", ctx->kdamond->pid);
- mutex_unlock(&ctx->kdamond_lock);
+ pr_debug("kdamond (%d) starts\n", current->pid);

if (ctx->primitive.init)
ctx->primitive.init(ctx);
@@ -705,7 +703,7 @@ static int kdamond_fn(void *data)
if (ctx->primitive.cleanup)
ctx->primitive.cleanup(ctx);

- pr_debug("kdamond (%d) finishes\n", ctx->kdamond->pid);
+ pr_debug("kdamond (%d) finishes\n", current->pid);
mutex_lock(&ctx->kdamond_lock);
ctx->kdamond = NULL;
mutex_unlock(&ctx->kdamond_lock);
_