lkml.org 
[lkml]   [2014]   [Dec]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 08/12] cpuset: use {cpu|node}mask pr_cont and seq output functions
Date
Convert the existing user of cpu{mask|list}_scnprintf() and
node{mask|list}_scnprintf() which use them just to printk or
seq_printf() the resulting buffer to use the following functions
instead respectively.

* For printk: cpu{mask|list}_pr_cont() and node{mask|list}_pr_cont().

* For seq_file: seq_cpumask[_list]() and seq_nodemask[_list]().

Because these conversions usually break up a single output function
call into multiple, the reduction is LOC isn't too big but it removes
unnecessary complexity and/or arbitrary limit on the length printed.

* kernel/cpuset.c::cpuset_print_task_mems_allowed() used a static
buffer which is protected by a dedicated spinlock. Replaced with
plain pr_conts.

This patch is dependent on the previous patch ("bitmap, cpumask,
nodemask: implement pr_cont variants of formatting functions") which
is planned to go through -mm. It'd be the easiest to route this
together. If this should go through the subsystem tree, please wait
till the forementioned patch is merged to mainline.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Li Zefan <lizefan@huawei.com>
---
kernel/cpuset.c | 13 +++----------
1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index fdf1759..6a7f466 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -2614,8 +2614,6 @@ int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
return nodes_intersects(tsk1->mems_allowed, tsk2->mems_allowed);
}

-#define CPUSET_NODELIST_LEN (256)
-
/**
* cpuset_print_task_mems_allowed - prints task's cpuset and mems_allowed
* @tsk: pointer to task_struct of some task.
@@ -2625,23 +2623,18 @@ int cpuset_mems_allowed_intersects(const struct task_struct *tsk1,
*/
void cpuset_print_task_mems_allowed(struct task_struct *tsk)
{
- /* Statically allocated to prevent using excess stack. */
- static char cpuset_nodelist[CPUSET_NODELIST_LEN];
- static DEFINE_SPINLOCK(cpuset_buffer_lock);
struct cgroup *cgrp;

- spin_lock(&cpuset_buffer_lock);
rcu_read_lock();

cgrp = task_cs(tsk)->css.cgroup;
- nodelist_scnprintf(cpuset_nodelist, CPUSET_NODELIST_LEN,
- tsk->mems_allowed);
pr_info("%s cpuset=", tsk->comm);
pr_cont_cgroup_name(cgrp);
- pr_cont(" mems_allowed=%s\n", cpuset_nodelist);
+ pr_cont(" mems_allowed=");
+ nodelist_pr_cont(tsk->mems_allowed);
+ pr_cont("\n");

rcu_read_unlock();
- spin_unlock(&cpuset_buffer_lock);
}

/*
--
2.1.0


\
 
 \ /
  Last update: 2014-12-10 17:21    [W:0.186 / U:0.144 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site