The patch titled
Subject: proc: task_state: move the main seq_printf() outside of rcu_read_lock()
has been added to the -mm tree. Its filename is
proc-task_state-move-the-main-seq_printf-outside-of-rcu_read_lock.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/proc-task_state-move-the-main-seq_printf-outside-of-rcu_read_lock.patch
echo and later at
echo http://ozlabs.org/~akpm/mmotm/broken-out/proc-task_state-move-the-main-seq_printf-outside-of-rcu_read_lock.patch
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------------------------------------------------------
From: Oleg Nesterov <oleg@xxxxxxxxxx>
Subject: proc: task_state: move the main seq_printf() outside of rcu_read_lock()
task_state() does seq_printf() under rcu_read_lock(), but this is only
needed for task_tgid_nr_ns() and task_numa_group_id(). We can calculate
tgid/ngid and drop rcu lock.
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Aaron Tomlin <atomlin@xxxxxxxxxx>
Cc: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Cc: "Eric W. Biederman" <ebiederm@xxxxxxxxxxxx>,
Cc: Sterling Alexander <stalexan@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Roland McGrath <roland@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/proc/array.c | 12 ++++++------
1 file changed, 6 insertions(+), 6 deletions(-)
diff -puN fs/proc/array.c~proc-task_state-move-the-main-seq_printf-outside-of-rcu_read_lock fs/proc/array.c
--- a/fs/proc/array.c~proc-task_state-move-the-main-seq_printf-outside-of-rcu_read_lock
+++ a/fs/proc/array.c
@@ -158,7 +158,7 @@ static inline void task_state(struct seq
struct group_info *group_info;
int g;
const struct cred *cred;
- pid_t ppid, tpid;
+ pid_t ppid, tpid, tgid, ngid;
unsigned int max_fds = 0;
rcu_read_lock();
@@ -170,12 +170,16 @@ static inline void task_state(struct seq
if (tracer)
tpid = task_pid_nr_ns(tracer, ns);
}
+
+ tgid = task_tgid_nr_ns(p, ns);
+ ngid = task_numa_group_id(p);
cred = get_task_cred(p);
task_lock(p);
if (p->files)
max_fds = files_fdtable(p->files)->max_fds;
task_unlock(p);
+ rcu_read_unlock();
seq_printf(m,
"State:\t%s\n"
@@ -188,10 +192,7 @@ static inline void task_state(struct seq
"Gid:\t%d\t%d\t%d\t%d\n"
"FDSize:\t%d\nGroups:\t",
get_task_state(p),
- task_tgid_nr_ns(p, ns),
- task_numa_group_id(p),
- pid_nr_ns(pid, ns),
- ppid, tpid,
+ tgid, ngid, pid_nr_ns(pid, ns), ppid, tpid,
from_kuid_munged(user_ns, cred->uid),
from_kuid_munged(user_ns, cred->euid),
from_kuid_munged(user_ns, cred->suid),
@@ -201,7 +202,6 @@ static inline void task_state(struct seq
from_kgid_munged(user_ns, cred->sgid),
from_kgid_munged(user_ns, cred->fsgid),
max_fds);
- rcu_read_unlock();
group_info = cred->group_info;
for (g = 0; g < group_info->ngroups; g++)
_
Patches currently in -mm which might be from oleg@xxxxxxxxxx are
mmfs-introduce-helpers-around-the-i_mmap_mutex.patch
mm-use-new-helper-functions-around-the-i_mmap_mutex.patch
mm-convert-i_mmap_mutex-to-rwsem.patch
mm-rmap-share-the-i_mmap_rwsem.patch
uprobes-share-the-i_mmap_rwsem.patch
mm-xip-share-the-i_mmap_rwsem.patch
mm-memory-failure-share-the-i_mmap_rwsem.patch
mm-nommu-share-the-i_mmap_rwsem.patch
mm-memoryc-share-the-i_mmap_rwsem.patch
proc-task_state-read-cred-group_info-outside-of-task_lock.patch
proc-task_state-deuglify-the-max_fds-calculation.patch
proc-task_state-move-the-main-seq_printf-outside-of-rcu_read_lock.patch
proc-task_state-ptrace_parent-doesnt-need-pid_alive-check.patch
sched_show_task-fix-unsafe-usage-of-real_parent.patch
exit-reparent-use-ptrace_entry-rather-than-sibling-for-exit_dead-tasks.patch
exit-reparent-cleanup-the-changing-of-parent.patch
exit-reparent-cleanup-the-usage-of-reparent_leader.patch
exit-ptrace-shift-reap-dead-code-from-exit_ptrace-to-forget_original_parent.patch
usermodehelper-dont-use-clone_vfork-for-____call_usermodehelper.patch
usermodehelper-kill-the-kmod_thread_locker-logic.patch
linux-next.patch
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