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From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Paul Menage <menage@google.com>, Li Zefan <lizf@cn.fujitsu.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Thomas Gleixner <tglx@linutronix.de>
Cc: containers@lists.linux-foundation.org,
	jacob.jun.pan@linux.intel.com,
	Arjan van de Ven <arjan@linux.intel.com>,
	linux-kernel@vger.kernel.org, Matt Helsley <matthltc@us.ibm.com>,
	linux-api@vger.kernel.org,
	"Kirill A. Shutemov" <kirill@shutemov.name>
Subject: [PATCH, v9 2/3] hrtimer: implement PR_GET_EFFECTIVE_TIMERSLACK
Date: Mon, 14 Mar 2011 16:05:23 +0200	[thread overview]
Message-ID: <1300111524-5666-3-git-send-email-kirill@shutemov.name> (raw)
In-Reply-To: <1300111524-5666-1-git-send-email-kirill@shutemov.name>

PR_GET_EFFECTIVE_TIMERSLACK allows process to know its effective timer
slack value.

Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
---
 include/linux/prctl.h |    6 ++++++
 kernel/sys.c          |    3 +++
 2 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/include/linux/prctl.h b/include/linux/prctl.h
index a3baeb2..3199458 100644
--- a/include/linux/prctl.h
+++ b/include/linux/prctl.h
@@ -102,4 +102,10 @@
 
 #define PR_MCE_KILL_GET 34
 
+/*
+ * Get effective timerslack value for the process.
+ * It can be higher than PR_GET_TIMERSLACK.
+ */
+#define PR_GET_EFFECTIVE_TIMERSLACK 35
+
 #endif /* _LINUX_PRCTL_H */
diff --git a/kernel/sys.c b/kernel/sys.c
index 18da702..b2ec8bf 100644
--- a/kernel/sys.c
+++ b/kernel/sys.c
@@ -1693,6 +1693,9 @@ SYSCALL_DEFINE5(prctl, int, option, unsigned long, arg2, unsigned long, arg3,
 		case PR_GET_TIMERSLACK:
 			error = current->timer_slack_ns;
 			break;
+		case PR_GET_EFFECTIVE_TIMERSLACK:
+			error = task_get_effective_timer_slack(current);
+			break;
 		case PR_SET_TIMERSLACK:
 			if (arg2 <= 0)
 				current->timer_slack_ns =
-- 
1.7.4.1


  parent reply	other threads:[~2011-03-14 14:05 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2011-03-14 14:05 [PATCH, v9 0/3] Introduce timer slack controller Kirill A. Shutemov
2011-03-14 14:05 ` [PATCH, v9 1/3] hrtimer: introduce effective timer slack Kirill A. Shutemov
2011-03-14 14:05 ` Kirill A. Shutemov [this message]
2011-03-14 14:05 ` [PATCH, v9 3/3] cgroups: introduce timer slack controller Kirill A. Shutemov
2011-03-14 23:46   ` Andrew Morton
2011-03-15  9:11     ` Kirill A. Shutemov
2011-03-16 11:35     ` jacob pan

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