From: Jing Xia <jing.xia.mail@gmail.com>
To: akpm@linux-foundation.org
Cc: npiggin@gmail.com, rppt@linux.ibm.com, allison@lohutok.net,
tglx@linutronix.de, linux-mm@kvack.org,
linux-kernel@vger.kernel.org, yuming.han@unisoc.com,
chunyang.zhang@unisoc.com, Jing Xia <jing.xia@unisoc.com>
Subject: [RFC] lib/show_mem.c: extend show_mem() to support showing drivers' memory consumption
Date: Fri, 17 Jan 2020 16:24:05 +0800 [thread overview]
Message-ID: <1579249445-27429-1-git-send-email-jing.xia.mail@gmail.com> (raw)
From: Jing Xia <jing.xia@unisoc.com>
In low memory situations, sometimes we need to check how much memory
a driver using.This patch add a notifer chain to show_mem.So a driver
can show their memory usage when show_mem_extend() is called.
Co-developed-by: Yuming Han <yuming.han@unisoc.com>
Signed-off-by: Yuming Han <yuming.han@unisoc.com>
Signed-off-by: Jing Xia <jing.xia@unisoc.com>
---
include/linux/mm.h | 9 +++++++++
lib/show_mem.c | 36 ++++++++++++++++++++++++++++++++++++
2 files changed, 45 insertions(+)
diff --git a/include/linux/mm.h b/include/linux/mm.h
index cfaa8fe..a37274a 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2201,6 +2201,15 @@ extern void memmap_init_zone(unsigned long, int, unsigned long, unsigned long,
#ifdef __HAVE_ARCH_RESERVED_KERNEL_PAGES
extern unsigned long arch_reserved_kernel_pages(void);
#endif
+enum show_mem_extend_type {
+ SHOW_MEM_EXTEND_BASIC,
+ SHOW_MEM_EXTEND_CLASSIC,
+ SHOW_MEM_EXTEND_ALL
+};
+extern int register_show_mem_notifier(struct notifier_block *nb);
+extern int unregister_show_mem_notifier(struct notifier_block *nb);
+extern void show_mem_extend(unsigned int flags, nodemask_t *nodemask,
+ enum show_mem_extend_type type);
extern __printf(3, 4)
void warn_alloc(gfp_t gfp_mask, nodemask_t *nodemask, const char *fmt, ...);
diff --git a/lib/show_mem.c b/lib/show_mem.c
index 1c26c14..6b013cb 100644
--- a/lib/show_mem.c
+++ b/lib/show_mem.c
@@ -7,6 +7,8 @@
#include <linux/mm.h>
#include <linux/cma.h>
+#include <linux/notifier.h>
+#include <linux/swap.h>
void show_mem(unsigned int filter, nodemask_t *nodemask)
{
@@ -42,3 +44,37 @@ void show_mem(unsigned int filter, nodemask_t *nodemask)
printk("%lu pages hwpoisoned\n", atomic_long_read(&num_poisoned_pages));
#endif
}
+
+static BLOCKING_NOTIFIER_HEAD(show_mem_notify_list);
+
+int register_show_mem_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_register(&show_mem_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(register_show_mem_notifier);
+
+int unregister_show_mem_notifier(struct notifier_block *nb)
+{
+ return blocking_notifier_chain_unregister(&show_mem_notify_list, nb);
+}
+EXPORT_SYMBOL_GPL(unregister_show_mem_notifier);
+
+void show_mem_extend(unsigned int filter, nodemask_t *nodemask,
+ enum show_mem_extend_type type)
+{
+ unsigned long used = 0;
+ struct sysinfo si;
+
+ pr_info("Mem-Info-Extend:\n");
+ show_mem(filter, NULL);
+ si_meminfo(&si);
+ pr_info("MemTotal: %8lu KB\n"
+ "Buffers: %8lu KB\n"
+ "SwapCached: %8lu KB\n",
+ (si.totalram) << (PAGE_SHIFT - 10),
+ (si.bufferram) << (PAGE_SHIFT - 10),
+ total_swapcache_pages() << (PAGE_SHIFT - 10));
+
+ blocking_notifier_call_chain(&show_mem_notify_list,
+ (unsigned long)type, &used);
+}
--
1.9.1
next reply other threads:[~2020-01-17 8:24 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-01-17 8:24 Jing Xia [this message]
2020-02-11 3:19 ` [RFC] lib/show_mem.c: extend show_mem() to support showing drivers' memory consumption Greg KH
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