linux-kernel - [RFC PATCH 2/5] fs/proc: Introduce /proc/all/statm

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Message-Id: <20200810145852.9330-3-elubarsky.linux@gmail.com>
Date:   Tue, 11 Aug 2020 00:58:49 +1000
From:   Eugene Lubarsky <elubarsky.linux@...il.com>
To:     linux-api@...r.kernel.org, linux-fsdevel@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, adobriyan@...il.com,
        avagin@...il.com, dsahern@...il.com
Subject: [RFC PATCH 2/5] fs/proc: Introduce /proc/all/statm

Returns statm lines for all visible processes with prepended PIDs.

Signed-off-by: Eugene Lubarsky <elubarsky.linux@...il.com>
---
 fs/proc/base.c | 14 ++++++++++++++
 1 file changed, 14 insertions(+)

diff --git a/fs/proc/base.c b/fs/proc/base.c
index e0f60a1528b7..8396a38ba7d2 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -3884,6 +3884,18 @@ static int proc_all_stat(struct seq_file *m, void *v)
 	return proc_tgid_stat(m, iter->ns, iter->tgid_iter.task->thread_pid, iter->tgid_iter.task);
 }
 
+static int proc_all_statm(struct seq_file *m, void *v)
+{
+	struct all_iter *iter = (struct all_iter *) v;
+	struct pid_namespace *ns = iter->ns;
+	struct task_struct *task = iter->tgid_iter.task;
+	struct pid *pid = task->thread_pid;
+
+	seq_put_decimal_ull(m, "", pid_nr_ns(pid, ns));
+	seq_puts(m, " ");
+	return proc_pid_statm(m, ns, pid, task);
+}
+
 
 #define PROC_ALL_OPS(NAME) static const struct seq_operations proc_all_##NAME##_ops = { \
 	.start	= proc_all_start, \
@@ -3893,6 +3905,7 @@ static int proc_all_stat(struct seq_file *m, void *v)
 }
 
 PROC_ALL_OPS(stat);
+PROC_ALL_OPS(statm);
 
 #define PROC_ALL_CREATE(NAME) \
 	do { \
@@ -3908,4 +3921,5 @@ void __init proc_all_init(void)
 		return;
 
 	PROC_ALL_CREATE(stat);
+	PROC_ALL_CREATE(statm);
 }
-- 
2.25.1