From: Huang Ying <ying.huang@intel.com>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
Huang Ying <ying.huang@intel.com>,
"Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Michal Hocko <mhocko@kernel.org>,
Johannes Weiner <hannes@cmpxchg.org>,
Shaohua Li <shli@kernel.org>, Hugh Dickins <hughd@google.com>,
Minchan Kim <minchan@kernel.org>, Rik van Riel <riel@redhat.com>,
Dave Hansen <dave.hansen@linux.intel.com>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Zi Yan <zi.yan@cs.rutgers.edu>,
Daniel Jordan <daniel.m.jordan@oracle.com>
Subject: [PATCH -V5 RESEND 02/21] swap: Add __swap_duplicate_locked()
Date: Wed, 12 Sep 2018 08:43:55 +0800 [thread overview]
Message-ID: <20180912004414.22583-3-ying.huang@intel.com> (raw)
In-Reply-To: <20180912004414.22583-1-ying.huang@intel.com>
The part of __swap_duplicate() with lock held is separated into a new
function __swap_duplicate_locked(). Because we will add more logic
about the PMD swap mapping into __swap_duplicate() and keep the most
PTE swap mapping related logic in __swap_duplicate_locked().
Just mechanical code refactoring, there is no any functional change in
this patch.
Signed-off-by: "Huang, Ying" <ying.huang@intel.com>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Shaohua Li <shli@kernel.org>
Cc: Hugh Dickins <hughd@google.com>
Cc: Minchan Kim <minchan@kernel.org>
Cc: Rik van Riel <riel@redhat.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>
Cc: Zi Yan <zi.yan@cs.rutgers.edu>
Cc: Daniel Jordan <daniel.m.jordan@oracle.com>
---
mm/swapfile.c | 63 +++++++++++++++++++++++++++++++++--------------------------
1 file changed, 35 insertions(+), 28 deletions(-)
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 97a1bd1a7c9a..6a570ef00fa7 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -3436,32 +3436,12 @@ void si_swapinfo(struct sysinfo *val)
spin_unlock(&swap_lock);
}
-/*
- * Verify that a swap entry is valid and increment its swap map count.
- *
- * Returns error code in following case.
- * - success -> 0
- * - swp_entry is invalid -> EINVAL
- * - swp_entry is migration entry -> EINVAL
- * - swap-cache reference is requested but there is already one. -> EEXIST
- * - swap-cache reference is requested but the entry is not used. -> ENOENT
- * - swap-mapped reference requested but needs continued swap count. -> ENOMEM
- */
-static int __swap_duplicate(swp_entry_t entry, unsigned char usage)
+static int __swap_duplicate_locked(struct swap_info_struct *p,
+ unsigned long offset, unsigned char usage)
{
- struct swap_info_struct *p;
- struct swap_cluster_info *ci;
- unsigned long offset;
unsigned char count;
unsigned char has_cache;
- int err = -EINVAL;
-
- p = get_swap_device(entry);
- if (!p)
- goto out;
-
- offset = swp_offset(entry);
- ci = lock_cluster_or_swap_info(p, offset);
+ int err = 0;
count = p->swap_map[offset];
@@ -3471,12 +3451,11 @@ static int __swap_duplicate(swp_entry_t entry, unsigned char usage)
*/
if (unlikely(swap_count(count) == SWAP_MAP_BAD)) {
err = -ENOENT;
- goto unlock_out;
+ goto out;
}
has_cache = count & SWAP_HAS_CACHE;
count &= ~SWAP_HAS_CACHE;
- err = 0;
if (usage == SWAP_HAS_CACHE) {
@@ -3503,11 +3482,39 @@ static int __swap_duplicate(swp_entry_t entry, unsigned char usage)
p->swap_map[offset] = count | has_cache;
-unlock_out:
+out:
+ return err;
+}
+
+/*
+ * Verify that a swap entry is valid and increment its swap map count.
+ *
+ * Returns error code in following case.
+ * - success -> 0
+ * - swp_entry is invalid -> EINVAL
+ * - swp_entry is migration entry -> EINVAL
+ * - swap-cache reference is requested but there is already one. -> EEXIST
+ * - swap-cache reference is requested but the entry is not used. -> ENOENT
+ * - swap-mapped reference requested but needs continued swap count. -> ENOMEM
+ */
+static int __swap_duplicate(swp_entry_t entry, unsigned char usage)
+{
+ struct swap_info_struct *p;
+ struct swap_cluster_info *ci;
+ unsigned long offset;
+ int err = -EINVAL;
+
+ p = get_swap_device(entry);
+ if (!p)
+ goto out;
+
+ offset = swp_offset(entry);
+ ci = lock_cluster_or_swap_info(p, offset);
+ err = __swap_duplicate_locked(p, offset, usage);
unlock_cluster_or_swap_info(p, ci);
+
+ put_swap_device(p);
out:
- if (p)
- put_swap_device(p);
return err;
}
--
2.16.4
next prev parent reply other threads:[~2018-09-12 0:44 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-09-12 0:43 [PATCH -V5 RESEND 00/21] swap: Swapout/swapin THP in one piece Huang Ying
2018-09-12 0:43 ` [PATCH -V5 RESEND 01/21] swap: Enable PMD swap operations for CONFIG_THP_SWAP Huang Ying
2018-09-12 0:43 ` Huang Ying [this message]
2018-09-12 0:43 ` [PATCH -V5 RESEND 03/21] swap: Support PMD swap mapping in swap_duplicate() Huang Ying
2018-09-12 0:43 ` [PATCH -V5 RESEND 04/21] swap: Support PMD swap mapping in put_swap_page() Huang Ying
2018-09-12 0:43 ` [PATCH -V5 RESEND 05/21] swap: Support PMD swap mapping in free_swap_and_cache()/swap_free() Huang Ying
2018-09-12 0:43 ` [PATCH -V5 RESEND 06/21] swap: Support PMD swap mapping when splitting huge PMD Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 07/21] swap: Support PMD swap mapping in split_swap_cluster() Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 08/21] swap: Support to read a huge swap cluster for swapin a THP Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 09/21] swap: Swapin a THP in one piece Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 10/21] swap: Support to count THP swapin and its fallback Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 11/21] swap: Add sysfs interface to configure THP swapin Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 12/21] swap: Support PMD swap mapping in swapoff Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 13/21] swap: Support PMD swap mapping in madvise_free() Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 14/21] swap: Support to move swap account for PMD swap mapping Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 15/21] swap: Support to copy PMD swap mapping when fork() Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 16/21] swap: Free PMD swap mapping when zap_huge_pmd() Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 17/21] swap: Support PMD swap mapping for MADV_WILLNEED Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 18/21] swap: Support PMD swap mapping in mincore() Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 19/21] swap: Support PMD swap mapping in common path Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 20/21] swap: create PMD swap mapping when unmap the THP Huang Ying
2018-09-12 0:44 ` [PATCH -V5 RESEND 21/21] swap: Update help of CONFIG_THP_SWAP Huang Ying
2018-09-25 7:13 [PATCH -V5 RESEND 00/21] swap: Swapout/swapin THP in one piece Huang Ying
2018-09-25 7:13 ` [PATCH -V5 RESEND 02/21] swap: Add __swap_duplicate_locked() Huang Ying
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20180912004414.22583-3-ying.huang@intel.com \
--to=ying.huang@intel.com \
--cc=aarcange@redhat.com \
--cc=akpm@linux-foundation.org \
--cc=daniel.m.jordan@oracle.com \
--cc=dave.hansen@linux.intel.com \
--cc=hannes@cmpxchg.org \
--cc=hughd@google.com \
--cc=kirill.shutemov@linux.intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=linux-mm@kvack.org \
--cc=mhocko@kernel.org \
--cc=minchan@kernel.org \
--cc=n-horiguchi@ah.jp.nec.com \
--cc=riel@redhat.com \
--cc=shli@kernel.org \
--cc=zi.yan@cs.rutgers.edu \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).