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From: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	Joel Fernandes <joel@joelfernandes.org>
Cc: RCU <rcu@vger.kernel.org>,
	Andrew Morton <akpm@linux-foundation.org>,
	Uladzislau Rezki <urezki@gmail.com>,
	Steven Rostedt <rostedt@goodmis.org>,
	Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>,
	Boqun Feng <boqun.feng@gmail.com>
Subject: [PATCH 1/7] rcu/tree: simplify KFREE_BULK_MAX_ENTR macro
Date: Mon, 23 Mar 2020 12:36:15 +0100
Message-ID: <20200323113621.12048-2-urezki@gmail.com> (raw)
In-Reply-To: <20200323113621.12048-1-urezki@gmail.com>

We can simplify KFREE_BULK_MAX_ENTR macro and get rid of
magic numbers which were used to make the structure to be
exactly one page.

Suggested-by: Boqun Feng <boqun.feng@gmail.com>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
---
 kernel/rcu/tree.c | 15 ++++++++-------
 1 file changed, 8 insertions(+), 7 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index e7963270e7f6..49ba1ff50af5 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -2740,13 +2740,6 @@ EXPORT_SYMBOL_GPL(call_rcu);
 #define KFREE_DRAIN_JIFFIES (HZ / 50)
 #define KFREE_N_BATCHES 2
 
-/*
- * This macro defines how many entries the "records" array
- * will contain. It is based on the fact that the size of
- * kfree_rcu_bulk_data structure becomes exactly one page.
- */
-#define KFREE_BULK_MAX_ENTR ((PAGE_SIZE / sizeof(void *)) - 3)
-
 /**
  * struct kfree_rcu_bulk_data - single block to store kfree_rcu() pointers
  * @nr_records: Number of active pointers in the array
@@ -2760,6 +2753,14 @@ struct kfree_rcu_bulk_data {
 	struct kfree_rcu_bulk_data *next;
 };
 
+/*
+ * This macro defines how many entries the "records" array
+ * will contain. It is based on the fact that the size of
+ * kfree_rcu_bulk_data structure becomes exactly one page.
+ */
+#define KFREE_BULK_MAX_ENTR \
+	((PAGE_SIZE - sizeof(struct kfree_rcu_bulk_data)) / sizeof(void *))
+
 /**
  * struct kfree_rcu_cpu_work - single batch of kfree_rcu() requests
  * @rcu_work: Let queue_rcu_work() invoke workqueue handler after grace period
-- 
2.20.1


  reply index

Thread overview: 12+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-23 11:36 [PATCH 0/7] Headless support in the kvfree_rcu() Uladzislau Rezki (Sony)
2020-03-23 11:36 ` Uladzislau Rezki (Sony) [this message]
2020-03-23 11:36 ` [PATCH 2/7] rcu/tree: maintain separate array for vmalloc ptrs Uladzislau Rezki (Sony)
2020-03-23 11:36 ` [PATCH 3/7] rcu/tree: introduce expedited_drain flag Uladzislau Rezki (Sony)
2020-03-23 11:36 ` [PATCH 4/7] rcu/tree: support reclaim for head-less object Uladzislau Rezki (Sony)
2020-03-29 22:56   ` Joel Fernandes
2020-03-30 12:48     ` Uladzislau Rezki
2020-03-23 11:36 ` [PATCH 5/7] rcu/tiny: move kvfree_call_rcu() out of header Uladzislau Rezki (Sony)
2020-03-23 11:36 ` [PATCH 6/7] rcu/tiny: support reclaim for head-less object Uladzislau Rezki (Sony)
2020-03-30  0:56   ` Joel Fernandes
2020-03-30 14:42     ` Uladzislau Rezki
2020-03-23 11:36 ` [PATCH 7/7] rcu: support headless variant in the kvfree_rcu() Uladzislau Rezki (Sony)

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