From: Hugh Dickins <hughd@google.com>
To: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>
Cc: Andrea Arcangeli <aarcange@redhat.com>,
Ning Qu <quning@gmail.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: [PATCH 07/24] huge tmpfs: include shmem freeholes in available memory counts
Date: Fri, 20 Feb 2015 20:03:20 -0800 (PST) [thread overview]
Message-ID: <alpine.LSU.2.11.1502202001560.14414@eggly.anvils> (raw)
In-Reply-To: <alpine.LSU.2.11.1502201941340.14414@eggly.anvils>
ShmemFreeHoles will be freed under memory pressure, but are not included
in MemFree: they need to be added into MemAvailable, and wherever the
kernel calculates freeable pages; but in a few other places also.
There is certainly room for debate about those places: I've made my
selection (and kept some notes), you may come up with a different list.
I decided against max_sane_readahead(), because I suspect it's already
too much; and left drivers/staging/android/lowmemorykiller.c out for now.
Signed-off-by: Hugh Dickins <hughd@google.com>
---
fs/proc/meminfo.c | 6 ++++++
mm/mmap.c | 1 +
mm/page-writeback.c | 2 ++
mm/vmscan.c | 3 ++-
4 files changed, 11 insertions(+), 1 deletion(-)
--- thpfs.orig/fs/proc/meminfo.c 2015-02-20 19:33:51.488038441 -0800
+++ thpfs/fs/proc/meminfo.c 2015-02-20 19:33:56.528026917 -0800
@@ -76,6 +76,12 @@ static int meminfo_proc_show(struct seq_
available += pagecache;
/*
+ * Shmem freeholes help to keep huge pages intact, but contain
+ * no data, and can be shrunk whenever small pages are needed.
+ */
+ available += global_page_state(NR_SHMEM_FREEHOLES);
+
+ /*
* Part of the reclaimable slab consists of items that are in use,
* and cannot be freed. Cap this estimate at the low watermark.
*/
--- thpfs.orig/mm/mmap.c 2015-02-08 18:54:22.000000000 -0800
+++ thpfs/mm/mmap.c 2015-02-20 19:33:56.528026917 -0800
@@ -168,6 +168,7 @@ int __vm_enough_memory(struct mm_struct
if (sysctl_overcommit_memory == OVERCOMMIT_GUESS) {
free = global_page_state(NR_FREE_PAGES);
+ free += global_page_state(NR_SHMEM_FREEHOLES);
free += global_page_state(NR_FILE_PAGES);
/*
--- thpfs.orig/mm/page-writeback.c 2015-02-08 18:54:22.000000000 -0800
+++ thpfs/mm/page-writeback.c 2015-02-20 19:33:56.532026908 -0800
@@ -187,6 +187,7 @@ static unsigned long zone_dirtyable_memo
nr_pages = zone_page_state(zone, NR_FREE_PAGES);
nr_pages -= min(nr_pages, zone->dirty_balance_reserve);
+ nr_pages += zone_page_state(zone, NR_SHMEM_FREEHOLES);
nr_pages += zone_page_state(zone, NR_INACTIVE_FILE);
nr_pages += zone_page_state(zone, NR_ACTIVE_FILE);
@@ -241,6 +242,7 @@ static unsigned long global_dirtyable_me
x = global_page_state(NR_FREE_PAGES);
x -= min(x, dirty_balance_reserve);
+ x += global_page_state(NR_SHMEM_FREEHOLES);
x += global_page_state(NR_INACTIVE_FILE);
x += global_page_state(NR_ACTIVE_FILE);
--- thpfs.orig/mm/vmscan.c 2015-02-20 19:33:31.056085158 -0800
+++ thpfs/mm/vmscan.c 2015-02-20 19:33:56.532026908 -0800
@@ -1946,7 +1946,8 @@ static void get_scan_count(struct lruvec
unsigned long zonefile;
unsigned long zonefree;
- zonefree = zone_page_state(zone, NR_FREE_PAGES);
+ zonefree = zone_page_state(zone, NR_FREE_PAGES) +
+ zone_page_state(zone, NR_SHMEM_FREEHOLES);
zonefile = zone_page_state(zone, NR_ACTIVE_FILE) +
zone_page_state(zone, NR_INACTIVE_FILE);
--
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next prev parent reply other threads:[~2015-02-21 4:03 UTC|newest]
Thread overview: 38+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-02-21 3:49 [PATCH 00/24] huge tmpfs: an alternative approach to THPageCache Hugh Dickins
2015-02-21 3:51 ` [PATCH 01/24] mm: update_lru_size warn and reset bad lru_size Hugh Dickins
2015-02-23 9:30 ` Kirill A. Shutemov
2015-03-23 2:44 ` Hugh Dickins
2015-02-21 3:54 ` [PATCH 02/24] mm: update_lru_size do the __mod_zone_page_state Hugh Dickins
2015-02-21 3:56 ` [PATCH 03/24] mm: use __SetPageSwapBacked and don't ClearPageSwapBacked Hugh Dickins
2015-02-25 10:53 ` Mel Gorman
2015-03-23 3:01 ` Hugh Dickins
2015-02-21 3:58 ` [PATCH 04/24] mm: make page migration's newpage handling more robust Hugh Dickins
2015-02-21 4:00 ` [PATCH 05/24] tmpfs: preliminary minor tidyups Hugh Dickins
2015-02-21 4:01 ` [PATCH 06/24] huge tmpfs: prepare counts in meminfo, vmstat and SysRq-m Hugh Dickins
2015-02-21 4:03 ` Hugh Dickins [this message]
2015-02-21 4:05 ` [PATCH 08/24] huge tmpfs: prepare huge=N mount option and /proc/sys/vm/shmem_huge Hugh Dickins
2015-02-21 4:06 ` [PATCH 09/24] huge tmpfs: try to allocate huge pages, split into a team Hugh Dickins
2015-02-21 4:07 ` [PATCH 10/24] huge tmpfs: avoid team pages in a few places Hugh Dickins
2015-02-21 4:09 ` [PATCH 11/24] huge tmpfs: shrinker to migrate and free underused holes Hugh Dickins
2015-03-19 16:56 ` Konstantin Khlebnikov
2015-03-23 4:40 ` Hugh Dickins
2015-03-23 12:50 ` Kirill A. Shutemov
2015-03-23 13:50 ` Kirill A. Shutemov
2015-03-24 12:57 ` Kirill A. Shutemov
2015-03-25 0:41 ` Hugh Dickins
2015-02-21 4:11 ` [PATCH 12/24] huge tmpfs: get_unmapped_area align and fault supply huge page Hugh Dickins
2015-02-21 4:12 ` [PATCH 13/24] huge tmpfs: extend get_user_pages_fast to shmem pmd Hugh Dickins
2015-02-21 4:13 ` [PATCH 14/24] huge tmpfs: extend vma_adjust_trans_huge " Hugh Dickins
2015-02-21 4:15 ` [PATCH 15/24] huge tmpfs: rework page_referenced_one and try_to_unmap_one Hugh Dickins
2015-02-21 4:16 ` [PATCH 16/24] huge tmpfs: fix problems from premature exposure of pagetable Hugh Dickins
2015-07-01 10:53 ` Kirill A. Shutemov
2015-02-21 4:18 ` [PATCH 17/24] huge tmpfs: map shmem by huge page pmd or by page team ptes Hugh Dickins
2015-02-21 4:20 ` [PATCH 18/24] huge tmpfs: mmap_sem is unlocked when truncation splits huge pmd Hugh Dickins
2015-02-21 4:22 ` [PATCH 19/24] huge tmpfs: disband split huge pmds on race or memory failure Hugh Dickins
2015-02-21 4:23 ` [PATCH 20/24] huge tmpfs: use Unevictable lru with variable hpage_nr_pages() Hugh Dickins
2015-02-21 4:25 ` [PATCH 21/24] huge tmpfs: fix Mlocked meminfo, tracking huge and unhuge mlocks Hugh Dickins
2015-02-21 4:27 ` [PATCH 22/24] huge tmpfs: fix Mapped meminfo, tracking huge and unhuge mappings Hugh Dickins
2015-02-21 4:29 ` [PATCH 23/24] kvm: plumb return of hva when resolving page fault Hugh Dickins
2015-02-21 4:31 ` [PATCH 24/24] kvm: teach kvm to map page teams as huge pages Hugh Dickins
2015-02-23 13:48 ` [PATCH 00/24] huge tmpfs: an alternative approach to THPageCache Kirill A. Shutemov
2015-03-23 2:25 ` Hugh Dickins
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