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Message-Id: <20230817080559.43200-7-byungchul@sk.com>
Date: Thu, 17 Aug 2023 17:05:59 +0900
From: Byungchul Park <byungchul@...com>
To: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc: kernel_team@...ynix.com, akpm@...ux-foundation.org,
ying.huang@...el.com, namit@...are.com, xhao@...ux.alibaba.com,
mgorman@...hsingularity.net, hughd@...gle.com, willy@...radead.org,
david@...hat.com, peterz@...radead.org, luto@...nel.org,
dave.hansen@...ux.intel.com
Subject: [RFC v2 6/6] mm, migrc: Implement internal allocator to minimize impact onto vm
(Not sure if this patch works meaningfully. Ignore if not.)
Signed-off-by: Byungchul Park <byungchul@...com>
---
mm/migrate.c | 23 +++++++++++++++++++++--
1 file changed, 21 insertions(+), 2 deletions(-)
diff --git a/mm/migrate.c b/mm/migrate.c
index c57536a0b2a6..6b5113d5a1e2 100644
--- a/mm/migrate.c
+++ b/mm/migrate.c
@@ -122,14 +122,33 @@ enum {
MIGRC_DST_PENDING,
};
+#define MAX_MIGRC_REQ_NR 4096
+static struct migrc_req migrc_req_pool_static[MAX_MIGRC_REQ_NR];
+static atomic_t migrc_req_pool_idx = ATOMIC_INIT(-1);
+static LLIST_HEAD(migrc_req_pool_llist);
+static DEFINE_SPINLOCK(migrc_req_pool_lock);
+
static struct migrc_req *alloc_migrc_req(void)
{
- return kmalloc(sizeof(struct migrc_req), GFP_KERNEL);
+ int idx = atomic_read(&migrc_req_pool_idx);
+ struct llist_node *n;
+
+ if (idx < MAX_MIGRC_REQ_NR - 1) {
+ idx = atomic_inc_return(&migrc_req_pool_idx);
+ if (idx < MAX_MIGRC_REQ_NR)
+ return migrc_req_pool_static + idx;
+ }
+
+ spin_lock(&migrc_req_pool_lock);
+ n = llist_del_first(&migrc_req_pool_llist);
+ spin_unlock(&migrc_req_pool_lock);
+
+ return n ? llist_entry(n, struct migrc_req, llnode) : NULL;
}
void free_migrc_req(struct migrc_req *req)
{
- kfree(req);
+ llist_add(&req->llnode, &migrc_req_pool_llist);
}
static bool migrc_is_full(int nid)
--
2.17.1
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