lkml.org 
[lkml]   [2012]   [Jan]   [31]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 01/10] cgroups: add res_counter_write_u64() API
Date
Extend the resource counter API with a mirror of res_counter_read_u64() to
make it handy to update a resource counter value from a cgroup subsystem
u64 value file.

[kirill@shutemov.name: Separate 32 bits and 64 bits versions]

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Acked-by: Paul Menage <paul@paulmenage.org>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Aditya Kali <adityakali@google.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Tim Hockin <thockin@hockin.org>
Cc: Tejun Heo <htejun@gmail.com>
Cc: Containers <containers@lists.linux-foundation.org>
Cc: Glauber Costa <glommer@gmail.com>
Cc: Cgroups <cgroups@vger.kernel.org>
Cc: Daniel J Walsh <dwalsh@redhat.com>
Cc: "Daniel P. Berrange" <berrange@redhat.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Max Kellermann <mk@cm4all.com>
Cc: Mandeep Singh Baines <msb@chromium.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Kirill A. Shutemov <kirill@shutemov.name>
---
include/linux/res_counter.h | 2 ++
kernel/res_counter.c | 31 +++++++++++++++++++++++++------
2 files changed, 27 insertions(+), 6 deletions(-)

diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index c9d625c..1b3fe05 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -82,6 +82,8 @@ int res_counter_memparse_write_strategy(const char *buf,
int res_counter_write(struct res_counter *counter, int member,
const char *buffer, write_strategy_fn write_strategy);

+void res_counter_write_u64(struct res_counter *counter, int member, u64 val);
+
/*
* the field descriptors. one for each member of res_counter
*/
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index 6d269cc..c46465c 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -167,12 +167,32 @@ int res_counter_memparse_write_strategy(const char *buf,
return 0;
}

+#if BITS_PER_LONG == 32
+void res_counter_write_u64(struct res_counter *counter, int member, u64 val)
+{
+ unsigned long long *target;
+ unsigned long flags;
+
+ spin_lock_irqsave(&counter->lock, flags);
+ target = res_counter_member(counter, member);
+ *target = val;
+ spin_unlock_irqrestore(&counter->lock, flags);
+}
+#else
+void res_counter_write_u64(struct res_counter *counter, int member, u64 val)
+{
+ unsigned long long *target;
+
+ target = res_counter_member(counter, member);
+ *target = val;
+}
+#endif
+
int res_counter_write(struct res_counter *counter, int member,
const char *buf, write_strategy_fn write_strategy)
{
char *end;
- unsigned long flags;
- unsigned long long tmp, *val;
+ unsigned long long tmp;

if (write_strategy) {
if (write_strategy(buf, &tmp))
@@ -182,9 +202,8 @@ int res_counter_write(struct res_counter *counter, int member,
if (*end != '\0')
return -EINVAL;
}
- spin_lock_irqsave(&counter->lock, flags);
- val = res_counter_member(counter, member);
- *val = tmp;
- spin_unlock_irqrestore(&counter->lock, flags);
+
+ res_counter_write_u64(counter, member, tmp);
+
return 0;
}
--
1.7.5.4


\
 
 \ /
  Last update: 2012-02-01 04:41    [W:0.353 / U:0.740 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site