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| author | Oleg Nesterov <oleg@redhat.com> | 2014-12-10 15:45:15 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2014-12-10 17:41:09 -0800 |
| commit | b0fafc11115938a3215723f37e8e9cc6a94b05b0 (patch) | |
| tree | d2bf204d75d4bbde98e9a3b83b812c3c8bceda20 | |
| parent | 0f4a0d53f20c76a70cb5b69b6aa237de2107e171 (diff) | |
| download | linux-b0fafc11115938a3215723f37e8e9cc6a94b05b0.tar.gz | |
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@redhat.com> Cc: Aaron Tomlin <atomlin@redhat.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: "Eric W. Biederman" <ebiederm@xmission.com>, Cc: Sterling Alexander <stalexan@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Roland McGrath <roland@hack.frob.com> Reviewed-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/proc/array.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/fs/proc/array.c b/fs/proc/array.c index 7c8d9aecb070..800e30f8f284 100644 --- a/fs/proc/array.c +++ b/fs/proc/array.c @@ -158,7 +158,7 @@ static inline void task_state(struct seq_file *m, struct pid_namespace *ns, 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_file *m, struct pid_namespace *ns, 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_file *m, struct pid_namespace *ns, "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_file *m, struct pid_namespace *ns, 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++) |