[PATCH RFC v4 11/13] mm/vmscan: Move count_vm_event(DROP_SLAB) into drop_slab()

From: David Hildenbrand <david@redhat.com>
To: linux-kernel@vger.kernel.org
Cc: linux-mm@kvack.org, virtio-dev@lists.oasis-open.org,
	virtualization@lists.linux-foundation.org, kvm@vger.kernel.org,
	Michal Hocko <mhocko@kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	"Michael S . Tsirkin" <mst@redhat.com>,
	David Hildenbrand <david@redhat.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-fsdevel@vger.kernel.org
Subject: [PATCH RFC v4 11/13] mm/vmscan: Move count_vm_event(DROP_SLAB) into drop_slab()
Date: Thu, 12 Dec 2019 18:11:35 +0100	[thread overview]
Message-ID: <20191212171137.13872-12-david@redhat.com> (raw)
In-Reply-To: <20191212171137.13872-1-david@redhat.com>

Let's count within the function itself, so every invocation (of future
users) will be counted.

Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-fsdevel@vger.kernel.org
Signed-off-by: David Hildenbrand <david@redhat.com>
---
 fs/drop_caches.c | 4 +---
 mm/vmscan.c      | 1 +
 2 files changed, 2 insertions(+), 3 deletions(-)

diff --git a/fs/drop_caches.c b/fs/drop_caches.c
index d31b6c72b476..a042da782fcd 100644
--- a/fs/drop_caches.c
+++ b/fs/drop_caches.c
@@ -61,10 +61,8 @@ int drop_caches_sysctl_handler(struct ctl_table *table, int write,
 			iterate_supers(drop_pagecache_sb, NULL);
 			count_vm_event(DROP_PAGECACHE);
 		}
-		if (sysctl_drop_caches & 2) {
+		if (sysctl_drop_caches & 2)
 			drop_slab();
-			count_vm_event(DROP_SLAB);
-		}
 		if (!stfu) {
 			pr_info("%s (%d): drop_caches: %d\n",
 				current->comm, task_pid_nr(current),
diff --git a/mm/vmscan.c b/mm/vmscan.c
index 5a6445e86328..c3e53502a84a 100644
--- a/mm/vmscan.c
+++ b/mm/vmscan.c
@@ -726,6 +726,7 @@ void drop_slab(void)
 
 	for_each_online_node(nid)
 		drop_slab_node(nid);
+	count_vm_event(DROP_SLAB);
 }
 
 static inline int is_page_cache_freeable(struct page *page)
-- 
2.23.0


