From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pg0-f71.google.com (mail-pg0-f71.google.com [74.125.83.71]) by kanga.kvack.org (Postfix) with ESMTP id 4A3866B0008 for ; Mon, 29 Jan 2018 03:29:52 -0500 (EST) Received: by mail-pg0-f71.google.com with SMTP id m3so4115313pgd.20 for ; Mon, 29 Jan 2018 00:29:52 -0800 (PST) Received: from NAM03-CO1-obe.outbound.protection.outlook.com (mail-co1nam03on0047.outbound.protection.outlook.com. [104.47.40.47]) by mx.google.com with ESMTPS id q27si11443829pfl.135.2018.01.29.00.29.50 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Mon, 29 Jan 2018 00:29:50 -0800 (PST) From: Roger He Subject: [PATCH] mm/swap: add function get_total_swap_pages to expose total_swap_pages Date: Mon, 29 Jan 2018 16:29:42 +0800 Message-ID: <1517214582-30880-1-git-send-email-Hongbo.He@amd.com> MIME-Version: 1.0 Content-Type: text/plain Sender: owner-linux-mm@kvack.org List-ID: To: dri-devel@lists.freedesktop.org Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Christian.Koenig@amd.com, Roger He ttm module needs it to determine its internal parameter setting. Signed-off-by: Roger He --- include/linux/swap.h | 6 ++++++ mm/swapfile.c | 15 +++++++++++++++ 2 files changed, 21 insertions(+) diff --git a/include/linux/swap.h b/include/linux/swap.h index c2b8128..708d66f 100644 --- a/include/linux/swap.h +++ b/include/linux/swap.h @@ -484,6 +484,7 @@ extern int try_to_free_swap(struct page *); struct backing_dev_info; extern int init_swap_address_space(unsigned int type, unsigned long nr_pages); extern void exit_swap_address_space(unsigned int type); +extern long get_total_swap_pages(void); #else /* CONFIG_SWAP */ @@ -516,6 +517,11 @@ static inline void show_swap_cache_info(void) { } +long get_total_swap_pages(void) +{ + return 0; +} + #define free_swap_and_cache(e) ({(is_migration_entry(e) || is_device_private_entry(e));}) #define swapcache_prepare(e) ({(is_migration_entry(e) || is_device_private_entry(e));}) diff --git a/mm/swapfile.c b/mm/swapfile.c index 3074b02..a0062eb 100644 --- a/mm/swapfile.c +++ b/mm/swapfile.c @@ -98,6 +98,21 @@ static atomic_t proc_poll_event = ATOMIC_INIT(0); atomic_t nr_rotate_swap = ATOMIC_INIT(0); +/* + * expose this value for others use + */ +long get_total_swap_pages(void) +{ + long ret; + + spin_lock(&swap_lock); + ret = total_swap_pages; + spin_unlock(&swap_lock); + + return ret; +} +EXPORT_SYMBOL_GPL(get_total_swap_pages); + static inline unsigned char swap_count(unsigned char ent) { return ent & ~SWAP_HAS_CACHE; /* may include SWAP_HAS_CONT flag */ -- 2.7.4 -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org