linux-kernel - [PATCH 03/14] proc: expose per file RSS

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Message-Id: <20220624080444.7619-4-christian.koenig@amd.com>
Date:   Fri, 24 Jun 2022 10:04:33 +0200
From:   "Christian König" 
        <ckoenig.leichtzumerken@...il.com>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        dri-devel@...ts.freedesktop.org
Cc:     mhocko@...e.com,
        Christian König <christian.koenig@....com>
Subject: [PATCH 03/14] proc: expose per file RSS

Add the per file RSS to the memory management accounting.

This allows to see the per file RSS in tools like top as well.

Signed-off-by: Christian König <christian.koenig@....com>
---
 fs/proc/array.c      | 7 +++++--
 fs/proc/internal.h   | 3 ++-
 fs/proc/task_mmu.c   | 6 ++++--
 fs/proc/task_nommu.c | 3 ++-
 4 files changed, 13 insertions(+), 6 deletions(-)

diff --git a/fs/proc/array.c b/fs/proc/array.c
index eb815759842c..a3aabe4ac7c8 100644
--- a/fs/proc/array.c
+++ b/fs/proc/array.c
@@ -437,7 +437,7 @@ int proc_pid_status(struct seq_file *m, struct pid_namespace *ns,
 	task_state(m, ns, pid, task);
 
 	if (mm) {
-		task_mem(m, mm);
+		task_mem(m, mm, task->files);
 		task_core_dumping(m, task);
 		task_thp_status(m, mm);
 		mmput(mm);
@@ -589,7 +589,8 @@ static int do_task_stat(struct seq_file *m, struct pid_namespace *ns,
 	seq_put_decimal_ull(m, " ", 0);
 	seq_put_decimal_ull(m, " ", start_time);
 	seq_put_decimal_ull(m, " ", vsize);
-	seq_put_decimal_ull(m, " ", mm ? get_mm_rss(mm) : 0);
+	seq_put_decimal_ull(m, " ", (mm ? get_mm_rss(mm) : 0) +
+			    files_rss(task->files));
 	seq_put_decimal_ull(m, " ", rsslim);
 	seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->start_code : 1) : 0);
 	seq_put_decimal_ull(m, " ", mm ? (permitted ? mm->end_code : 1) : 0);
@@ -673,6 +674,8 @@ int proc_pid_statm(struct seq_file *m, struct pid_namespace *ns,
 		size = task_statm(mm, &shared, &text, &data, &resident);
 		mmput(mm);
 
+		shared += files_rss(task->files);
+
 		/*
 		 * For quick read, open code by putting numbers directly
 		 * expected format is
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 06a80f78433d..1b123893f7ae 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -305,7 +305,8 @@ extern unsigned long task_vsize(struct mm_struct *);
 extern unsigned long task_statm(struct mm_struct *,
 				unsigned long *, unsigned long *,
 				unsigned long *, unsigned long *);
-extern void task_mem(struct seq_file *, struct mm_struct *);
+extern void task_mem(struct seq_file *, struct mm_struct *,
+		     struct files_struct *);
 
 extern const struct dentry_operations proc_net_dentry_ops;
 static inline void pde_force_lookup(struct proc_dir_entry *pde)
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index 2d04e3470d4c..a4adc6fc13d3 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -20,6 +20,7 @@
 #include <linux/shmem_fs.h>
 #include <linux/uaccess.h>
 #include <linux/pkeys.h>
+#include <linux/fdtable.h>
 
 #include <asm/elf.h>
 #include <asm/tlb.h>
@@ -28,13 +29,14 @@
 
 #define SEQ_PUT_DEC(str, val) \
 		seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8)
-void task_mem(struct seq_file *m, struct mm_struct *mm)
+void task_mem(struct seq_file *m, struct mm_struct *mm,
+	      struct files_struct *files)
 {
 	unsigned long text, lib, swap, anon, file, shmem;
 	unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss;
 
 	anon = get_mm_counter(mm, MM_ANONPAGES);
-	file = get_mm_counter(mm, MM_FILEPAGES);
+	file = get_mm_counter(mm, MM_FILEPAGES) + files_rss(files);
 	shmem = get_mm_counter(mm, MM_SHMEMPAGES);
 
 	/*
diff --git a/fs/proc/task_nommu.c b/fs/proc/task_nommu.c
index a6d21fc0033c..5b6b9c5ed9ec 100644
--- a/fs/proc/task_nommu.c
+++ b/fs/proc/task_nommu.c
@@ -18,7 +18,8 @@
  * each process that owns it. Non-shared memory is counted
  * accurately.
  */
-void task_mem(struct seq_file *m, struct mm_struct *mm)
+void task_mem(struct seq_file *m, struct mm_struct *mm,
+	      struct files_struct *files)
 {
 	struct vm_area_struct *vma;
 	struct vm_region *region;
-- 
2.25.1