linux-kernel - [RFC PATCH v5 3/8] mm: Display inflated memory to users

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Message-Id: <20221019095620.124909-4-alexander.atanasov@virtuozzo.com>
Date:   Wed, 19 Oct 2022 12:56:15 +0300
From:   Alexander Atanasov <alexander.atanasov@...tuozzo.com>
To:     Jonathan Corbet <corbet@....net>
Cc:     kernel@...nvz.org,
        Alexander Atanasov <alexander.atanasov@...tuozzo.com>,
        linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-doc@...r.kernel.org
Subject: [RFC PATCH v5 3/8] mm: Display inflated memory to users

Add InflatedTotal and InflatedFree to /proc/meminfo

Signed-off-by: Alexander Atanasov <alexander.atanasov@...tuozzo.com>
---
 Documentation/filesystems/proc.rst |  6 ++++++
 fs/proc/meminfo.c                  | 10 ++++++++++
 2 files changed, 16 insertions(+)

diff --git a/Documentation/filesystems/proc.rst b/Documentation/filesystems/proc.rst
index 898c99eae8e4..d88828a27383 100644
--- a/Documentation/filesystems/proc.rst
+++ b/Documentation/filesystems/proc.rst
@@ -992,6 +992,8 @@ Example output. You may not have all of these fields.
     VmallocUsed:       40444 kB
     VmallocChunk:          0 kB
     Percpu:            29312 kB
+    InflatedTotal:   2097152 kB
+    InflatedFree:          0 kB
     HardwareCorrupted:     0 kB
     AnonHugePages:   4149248 kB
     ShmemHugePages:        0 kB
@@ -1142,6 +1144,10 @@ VmallocChunk
 Percpu
               Memory allocated to the percpu allocator used to back percpu
               allocations. This stat excludes the cost of metadata.
+InflatedTotal and InflatedFree
+               Amount of memory that is inflated by the balloon driver.
+               Due to differences among the drivers inflated memory
+               is subtracted from TotalRam or from MemFree.
 HardwareCorrupted
               The amount of RAM/memory in KB, the kernel identifies as
               corrupted.
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 5101131e6047..d9e059b0b25d 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -16,6 +16,9 @@
 #ifdef CONFIG_CMA
 #include <linux/cma.h>
 #endif
+#ifdef CONFIG_MEMORY_BALLOON
+#include <linux/balloon.h>
+#endif
 #include <asm/page.h>
 #include "internal.h"
 
@@ -155,6 +158,13 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
 		    global_zone_page_state(NR_FREE_CMA_PAGES));
 #endif
 
+#ifdef CONFIG_MEMORY_BALLOON
+	seq_printf(m,  "InflatedTotal:  %8ld kB\n",
+		atomic_long_read(&mem_balloon_inflated_total_kb));
+	seq_printf(m,  "InflatedFree:   %8ld kB\n",
+		atomic_long_read(&mem_balloon_inflated_free_kb));
+#endif
+
 	hugetlb_report_meminfo(m);
 
 	arch_report_meminfo(m);
-- 
2.31.1