lists.openwall.net   lists  /  announce  owl-users  owl-dev  john-users  john-dev  passwdqc-users  yescrypt  popa3d-users  /  oss-security  kernel-hardening  musl  sabotage  tlsify  passwords  /  crypt-dev  xvendor  /  Bugtraq  Full-Disclosure  linux-kernel  linux-netdev  linux-ext4  linux-hardening  linux-cve-announce  PHC 
Open Source and information security mailing list archives
 
Hash Suite for Android: free password hash cracker in your pocket
[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]
Message-Id: <1435157880-22925-2-git-send-email-riel@redhat.com>
Date:	Wed, 24 Jun 2015 10:57:50 -0400
From:	riel@...hat.com
To:	linux-kernel@...r.kernel.org
Cc:	fweisbec@...hat.com, peterz@...radead.org, mingo@...nel.org,
	tglx@...utronix.de, luto@...capital.net
Subject: [RFC PATCH 01/11] nohz,time: make account_process_tick work on the task's CPU

From: Rik van Riel <riel@...hat.com>

Teach account_process_tick to work on the CPU of the task
specified in the function argument. This allows us to do
remote tick based sampling of a nohz_full cpu from a
housekeeping CPU.

Signed-off-by: Rik van Riel <riel@...hat.com>
---
 kernel/sched/cputime.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 8394b1ee600c..97077c282626 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -463,8 +463,14 @@ void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime
 void account_process_tick(struct task_struct *p, int user_tick)
 {
 	cputime_t one_jiffy_scaled = cputime_to_scaled(cputime_one_jiffy);
-	struct rq *rq = this_rq();
+	int cpu = task_cpu(p);
+	struct rq *rq = cpu_rq(cpu);
 
+	/*
+	 * Tests current CPU, not "cpu", to see whether account_process_tick()
+	 * should do work on this invocation, or whether time keeping for
+	 * this CPU is done in some other way.
+	 */
 	if (vtime_accounting_enabled())
 		return;
 
-- 
2.1.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

Powered by blists - more mailing lists

Powered by Openwall GNU/*/Linux Powered by OpenVZ