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Message-Id: <6ffe3c7e6a5dcba2e565d5eca16604ce3ade7bfa.1481317367.git.tim.c.chen@linux.intel.com>
Date: Fri, 9 Dec 2016 13:09:21 -0800
From: Tim Chen <tim.c.chen@...ux.intel.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Tim Chen <tim.c.chen@...ux.intel.com>,
Ying Huang <ying.huang@...el.com>, dave.hansen@...el.com,
ak@...ux.intel.com, aaron.lu@...el.com, linux-mm@...ck.org,
linux-kernel@...r.kernel.org, Hugh Dickins <hughd@...gle.com>,
Shaohua Li <shli@...nel.org>, Minchan Kim <minchan@...nel.org>,
Rik van Riel <riel@...hat.com>,
Andrea Arcangeli <aarcange@...hat.com>,
"Kirill A . Shutemov" <kirill.shutemov@...ux.intel.com>,
Vladimir Davydov <vdavydov.dev@...il.com>,
Johannes Weiner <hannes@...xchg.org>,
Michal Hocko <mhocko@...nel.org>,
Hillf Danton <hillf.zj@...baba-inc.com>,
Christian Borntraeger <borntraeger@...ibm.com>,
Jonathan Corbet <corbet@....net>
Subject: [PATCH v4 8/9] mm/swap: Enable swap slots cache usage
Initialize swap slots cache and enable it on swap on.
Drain all swap slots on swap off.
Signed-off-by: Tim Chen <tim.c.chen@...ux.intel.com>
---
mm/swapfile.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 3a6cad1..2440cec 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -2184,6 +2184,8 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
spin_unlock(&p->lock);
spin_unlock(&swap_lock);
+ disable_swap_slots_cache_lock();
+
set_current_oom_origin();
err = try_to_unuse(p->type, false, 0); /* force unuse all pages */
clear_current_oom_origin();
@@ -2191,9 +2193,12 @@ SYSCALL_DEFINE1(swapoff, const char __user *, specialfile)
if (err) {
/* re-insert swap space back into swap_list */
reinsert_swap_info(p);
+ reenable_swap_slots_cache_unlock();
goto out_dput;
}
+ reenable_swap_slots_cache_unlock();
+
flush_work(&p->discard_work);
destroy_swap_extents(p);
@@ -2871,6 +2876,8 @@ SYSCALL_DEFINE2(swapon, const char __user *, specialfile, int, swap_flags)
putname(name);
if (inode && S_ISREG(inode->i_mode))
inode_unlock(inode);
+ if (!error)
+ enable_swap_slots_cache();
return error;
}
--
2.5.5
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