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From: "Uladzislau Rezki (Sony)" <urezki@gmail.com>
To: LKML <linux-kernel@vger.kernel.org>, RCU <rcu@vger.kernel.org>,
	"Paul E . McKenney" <paulmck@kernel.org>,
	Michael Ellerman <mpe@ellerman.id.au>
Cc: Andrew Morton <akpm@linux-foundation.org>,
	Daniel Axtens <dja@axtens.net>,
	Frederic Weisbecker <frederic@kernel.org>,
	Neeraj Upadhyay <neeraju@codeaurora.org>,
	Joel Fernandes <joel@joelfernandes.org>,
	Peter Zijlstra <peterz@infradead.org>,
	Michal Hocko <mhocko@suse.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	"Theodore Y . Ts'o" <tytso@mit.edu>,
	Sebastian Andrzej Siewior <bigeasy@linutronix.de>,
	Uladzislau Rezki <urezki@gmail.com>,
	Oleksiy Avramchenko <oleksiy.avramchenko@sonymobile.com>
Subject: [PATCH 2/3] kvfree_rcu: Use __GFP_NOMEMALLOC for single-argument kvfree_rcu()
Date: Wed, 20 Jan 2021 17:21:47 +0100	[thread overview]
Message-ID: <20210120162148.1973-2-urezki@gmail.com> (raw)
In-Reply-To: <20210120162148.1973-1-urezki@gmail.com>

From: "Paul E. McKenney" <paulmck@kernel.org>

This commit applies the __GFP_NOMEMALLOC gfp flag to memory allocations
carried out by the single-argument variant of kvfree_rcu(), thus avoiding
this can-sleep code path from dipping into the emergency reserves.

Acked-by: Michal Hocko <mhocko@suse.com>
Suggested-by: Michal Hocko <mhocko@suse.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
---
 kernel/rcu/tree.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 2014fb22644d..454809514c91 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3491,7 +3491,7 @@ add_ptr_to_bulk_krc_lock(struct kfree_rcu_cpu **krcp,
 		if (!bnode && can_alloc) {
 			krc_this_cpu_unlock(*krcp, *flags);
 			bnode = (struct kvfree_rcu_bulk_data *)
-				__get_free_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOWARN);
+				__get_free_page(GFP_KERNEL | __GFP_RETRY_MAYFAIL | __GFP_NOMEMALLOC | __GFP_NOWARN);
 			*krcp = krc_this_cpu_lock(flags);
 		}
 
-- 
2.20.1


  reply	other threads:[~2021-01-20 16:27 UTC|newest]

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-20 16:21 [PATCH 1/3] kvfree_rcu: Allocate a page for a single argument Uladzislau Rezki (Sony)
2021-01-20 16:21 ` Uladzislau Rezki (Sony) [this message]
2021-01-28 18:06   ` [PATCH 2/3] kvfree_rcu: Use __GFP_NOMEMALLOC for single-argument kvfree_rcu() Uladzislau Rezki
2021-01-20 16:21 ` [PATCH 3/3] kvfree_rcu: use migrate_disable/enable() Uladzislau Rezki (Sony)
2021-01-20 19:45   ` Sebastian Andrzej Siewior
2021-01-20 21:42     ` Paul E. McKenney
2021-01-23  9:31   ` 回复: " Zhang, Qiang
2021-01-24 21:57     ` Uladzislau Rezki
2021-01-25  1:50       ` 回复: " Zhang, Qiang
2021-01-25  2:18         ` Zhang, Qiang
2021-01-25 13:49           ` Uladzislau Rezki
2021-01-26  9:33             ` 回复: " Zhang, Qiang
2021-01-26 13:43               ` Uladzislau Rezki
2021-01-20 18:40 ` [PATCH 1/3] kvfree_rcu: Allocate a page for a single argument Paul E. McKenney
2021-01-20 19:57 ` Sebastian Andrzej Siewior
2021-01-20 21:54   ` Paul E. McKenney
2021-01-21 13:35     ` Uladzislau Rezki
2021-01-21 15:07       ` Paul E. McKenney
2021-01-21 19:17         ` Uladzislau Rezki
2021-01-22 11:17     ` Sebastian Andrzej Siewior
2021-01-22 15:28       ` Paul E. McKenney
2021-01-21 12:38   ` Uladzislau Rezki
2021-01-22 11:34     ` Sebastian Andrzej Siewior
2021-01-22 14:21       ` Uladzislau Rezki
2021-01-25 13:22 ` Michal Hocko
2021-01-25 14:31   ` Uladzislau Rezki
2021-01-25 15:39     ` Michal Hocko
2021-01-25 16:25       ` Uladzislau Rezki
2021-01-28 15:11         ` Uladzislau Rezki
2021-01-28 15:17           ` Michal Hocko
2021-01-28 15:30             ` Uladzislau Rezki
2021-01-28 18:02               ` Uladzislau Rezki
     [not found]                 ` <YBPNvbJLg56XU8co@dhcp22.suse.cz>
2021-01-29 16:35                   ` Uladzislau Rezki
2021-02-01 11:47                     ` Michal Hocko
2021-02-01 14:44                       ` Uladzislau Rezki
2021-02-03 19:37                       ` Paul E. McKenney

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