From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx141.postini.com [74.125.245.141]) by kanga.kvack.org (Postfix) with SMTP id 2F3FD6B006E for ; Sun, 10 Jun 2012 06:50:07 -0400 (EDT) Received: by mail-bk0-f41.google.com with SMTP id jm19so3841575bkc.14 for ; Sun, 10 Jun 2012 03:50:06 -0700 (PDT) From: Sasha Levin Subject: [PATCH v3 03/10] mm: frontswap: split out __frontswap_curr_pages Date: Sun, 10 Jun 2012 12:51:01 +0200 Message-Id: <1339325468-30614-4-git-send-email-levinsasha928@gmail.com> In-Reply-To: <1339325468-30614-1-git-send-email-levinsasha928@gmail.com> References: <1339325468-30614-1-git-send-email-levinsasha928@gmail.com> Sender: owner-linux-mm@kvack.org List-ID: To: dan.magenheimer@oracle.com, konrad.wilk@oracle.com Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Sasha Levin Code was duplicated in two functions, clean it up. Also, assert that the deduplicated code runs under the swap spinlock. Signed-off-by: Sasha Levin --- mm/frontswap.c | 28 +++++++++++++++++----------- 1 files changed, 17 insertions(+), 11 deletions(-) diff --git a/mm/frontswap.c b/mm/frontswap.c index 7ec53d5..5faf840 100644 --- a/mm/frontswap.c +++ b/mm/frontswap.c @@ -216,6 +216,20 @@ void __frontswap_invalidate_area(unsigned type) } EXPORT_SYMBOL(__frontswap_invalidate_area); +static unsigned long __frontswap_curr_pages(void) +{ + int type; + unsigned long totalpages = 0; + struct swap_info_struct *si = NULL; + + assert_spin_locked(&swap_lock); + for (type = swap_list.head; type >= 0; type = si->next) { + si = swap_info[type]; + totalpages += atomic_read(&si->frontswap_pages); + } + return totalpages; +} + /* * Frontswap, like a true swap device, may unnecessarily retain pages * under certain circumstances; "shrink" frontswap is essentially a @@ -240,11 +254,7 @@ void frontswap_shrink(unsigned long target_pages) */ spin_lock(&swap_lock); locked = true; - total_pages = 0; - for (type = swap_list.head; type >= 0; type = si->next) { - si = swap_info[type]; - total_pages += atomic_read(&si->frontswap_pages); - } + total_pages = __frontswap_curr_pages(); if (total_pages <= target_pages) goto out; total_pages_to_unuse = total_pages - target_pages; @@ -282,16 +292,12 @@ EXPORT_SYMBOL(frontswap_shrink); */ unsigned long frontswap_curr_pages(void) { - int type; unsigned long totalpages = 0; - struct swap_info_struct *si = NULL; spin_lock(&swap_lock); - for (type = swap_list.head; type >= 0; type = si->next) { - si = swap_info[type]; - totalpages += atomic_read(&si->frontswap_pages); - } + totalpages = __frontswap_curr_pages(); spin_unlock(&swap_lock); + return totalpages; } EXPORT_SYMBOL(frontswap_curr_pages); -- 1.7.8.6 -- 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