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Commit 88b72b31 authored by Tejun Heo's avatar Tejun Heo
Browse files

proc: Consolidate task->comm formatting into proc_task_name() 



proc shows task->comm in three places - comm, stat, status - and each
is fetching and formatting task->comm slighly differently.  This patch
renames task_name() to proc_task_name(), makes it more generic, and
updates all three paths to use it.

This will enable expanding comm reporting for workqueue workers.

Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent 8bf89593

fs/proc/array.c

+15 −11
Original line number Diff line number Diff line
@@ -95,7 +95,7 @@ 
#include <asm/processor.h>

#include "internal.h"



static inline void task_name(struct seq_file *m, struct task_struct *p)

void proc_task_name(struct seq_file *m, struct task_struct *p, bool escape)

{

	char *buf;

	size_t size;
@@ -104,13 +104,17 @@ static inline void task_name(struct seq_file *m, struct task_struct *p) 


	get_task_comm(tcomm, p);



	seq_puts(m, "Name:\t");



	size = seq_get_buf(m, &buf);

	ret = string_escape_str(tcomm, buf, size, ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");

	seq_commit(m, ret < size ? ret : -1);

	if (escape) {

		ret = string_escape_str(tcomm, buf, size,

					ESCAPE_SPACE | ESCAPE_SPECIAL, "\n\\");

		if (ret >= size)

			ret = -1;

	} else {

		ret = strscpy(buf, tcomm, size);

	}



	seq_putc(m, '\n');

	seq_commit(m, ret);

}



/*
@@ -365,7 +369,10 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns, 
{

	struct mm_struct *mm = get_task_mm(task);



	task_name(m, task);

	seq_puts(m, "Name:\t");

	proc_task_name(m, task, true);

	seq_putc(m, '\n');



	task_state(m, ns, pid, task);



	if (mm) {
@@ -400,7 +407,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 
	u64 cutime, cstime, utime, stime;

	u64 cgtime, gtime;

	unsigned long rsslim = 0;

	char tcomm[sizeof(task->comm)];

	unsigned long flags;



	state = *get_task_state(task);
@@ -427,8 +433,6 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 
		}

	}



	get_task_comm(tcomm, task);



	sigemptyset(&sigign);

	sigemptyset(&sigcatch);

	cutime = cstime = utime = stime = 0;
@@ -495,7 +499,7 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns, 


	seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));

	seq_puts(m, " (");

	seq_puts(m, tcomm);

	proc_task_name(m, task, false);

	seq_puts(m, ") ");

	seq_putc(m, state);

	seq_put_decimal_ll(m, " ", ppid);

fs/proc/base.c

+2 −3
Original line number Diff line number Diff line
@@ -1565,9 +1565,8 @@ static int comm_show(struct seq_file *m, void *v) 
	if (!p)

		return -ESRCH;



	task_lock(p);

	seq_printf(m, "%s\n", p->comm);

	task_unlock(p);

	proc_task_name(m, p, false);

	seq_putc(m, '\n');



	put_task_struct(p);

fs/proc/internal.h

+2 −0
Original line number Diff line number Diff line
@@ -131,6 +131,8 @@ unsigned name_to_int(const struct qstr *qstr); 
 */

extern const struct file_operations proc_tid_children_operations;



extern void proc_task_name(struct seq_file *m, struct task_struct *p,

			   bool escape);

extern int proc_tid_stat(struct seq_file *, struct pid_namespace *,

			 struct pid *, struct task_struct *);

extern int proc_tgid_stat(struct seq_file *, struct pid_namespace *,