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Date: Fri, 29 Jun 2018 17:37:02 +0200
From: Vlastimil Babka <vbabka@...e.cz>
To: kbuild test robot <lkp@...el.com>
Cc: kbuild-all@...org, Andrew Morton <akpm@...ux-foundation.org>,
linux-mm@...ck.org, linux-kernel@...r.kernel.org,
Roman Gushchin <guro@...com>, Michal Hocko <mhocko@...nel.org>,
Johannes Weiner <hannes@...xchg.org>,
linux-api@...r.kernel.org, Christoph Lameter <cl@...ux.com>,
David Rientjes <rientjes@...gle.com>,
Mel Gorman <mgorman@...hsingularity.net>,
Matthew Wilcox <willy@...radead.org>,
Vijayanand Jitta <vjitta@...eaurora.org>,
Laura Abbott <labbott@...hat.com>,
Sumit Semwal <sumit.semwal@...aro.org>
Subject: Re: [PATCH v2 5/7] mm: rename and change semantics of
nr_indirectly_reclaimable_bytes
On 06/20/2018 01:23 PM, kbuild test robot wrote:
> Hi Vlastimil,
>
> Thank you for the patch! Yet something to improve:
>
> [auto build test ERROR on mmotm/master]
> [also build test ERROR on v4.18-rc1 next-20180619]
> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
>
> url: https://github.com/0day-ci/linux/commits/Vlastimil-Babka/kmalloc-reclaimable-caches/20180618-172912
> base: git://git.cmpxchg.org/linux-mmotm.git master
> config: x86_64-allmodconfig (attached as .config)
> compiler: gcc-7 (Debian 7.3.0-16) 7.3.0
> reproduce:
> # save the attached .config to linux build tree
> make ARCH=x86_64
>
> All errors (new ones prefixed by >>):
>
> drivers/staging//android/ion/ion_page_pool.c: In function 'ion_page_pool_remove':
>>> drivers/staging//android/ion/ion_page_pool.c:56:40: error: 'NR_INDIRECTLY_RECLAIMABLE_BYTES' undeclared (first use in this function)
> mod_node_page_state(page_pgdat(page), NR_INDIRECTLY_RECLAIMABLE_BYTES,
> ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/staging//android/ion/ion_page_pool.c:56:40: note: each undeclared identifier is reported only once for each function it appears in
>
> vim +/NR_INDIRECTLY_RECLAIMABLE_BYTES +56 drivers/staging//android/ion/ion_page_pool.c
Looks like I missed a hunk, updated patch below.
----8<----
>From a0053c64c72d7e094252d0d7462de8569d87c543 Mon Sep 17 00:00:00 2001
From: Vlastimil Babka <vbabka@...e.cz>
Date: Tue, 22 May 2018 16:10:10 +0200
Subject: [PATCH v3 5/7] mm: rename and change semantics of
nr_indirectly_reclaimable_bytes
The vmstat counter NR_INDIRECTLY_RECLAIMABLE_BYTES was introduced by commit
eb59254608bc ("mm: introduce NR_INDIRECTLY_RECLAIMABLE_BYTES") with the goal of
accounting objects that can be reclaimed, but cannot be allocated via a
SLAB_RECLAIM_ACCOUNT cache. This is now possible via kmalloc() with
__GFP_RECLAIMABLE flag, and the dcache external names user is converted.
The counter is however still useful for accounting direct page allocations
(i.e. not slab) with a shrinker, such as the ION page pool. So keep it, and:
- change granularity to pages to be more like other counters; sub-page
allocations should be able to use kmalloc
- rename the counter to NR_KERNEL_MISC_RECLAIMABLE
- expose the counter again in vmstat as "nr_kernel_misc_reclaimable"; we can
again remove the check for not printing "hidden" counters
Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
Cc: Vijayanand Jitta <vjitta@...eaurora.org>
Cc: Laura Abbott <labbott@...hat.com>
Cc: Sumit Semwal <sumit.semwal@...aro.org>
---
drivers/staging/android/ion/ion_page_pool.c | 8 ++++----
include/linux/mmzone.h | 2 +-
mm/page_alloc.c | 19 +++++++------------
mm/util.c | 3 +--
mm/vmstat.c | 6 +-----
5 files changed, 14 insertions(+), 24 deletions(-)
diff --git a/drivers/staging/android/ion/ion_page_pool.c b/drivers/staging/android/ion/ion_page_pool.c
index 9bc56eb48d2a..0d2a95957ee8 100644
--- a/drivers/staging/android/ion/ion_page_pool.c
+++ b/drivers/staging/android/ion/ion_page_pool.c
@@ -33,8 +33,8 @@ static void ion_page_pool_add(struct ion_page_pool *pool, struct page *page)
pool->low_count++;
}
- mod_node_page_state(page_pgdat(page), NR_INDIRECTLY_RECLAIMABLE_BYTES,
- (1 << (PAGE_SHIFT + pool->order)));
+ mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE,
+ 1 << pool->order);
mutex_unlock(&pool->mutex);
}
@@ -53,8 +53,8 @@ static struct page *ion_page_pool_remove(struct ion_page_pool *pool, bool high)
}
list_del(&page->lru);
- mod_node_page_state(page_pgdat(page), NR_INDIRECTLY_RECLAIMABLE_BYTES,
- -(1 << (PAGE_SHIFT + pool->order)));
+ mod_node_page_state(page_pgdat(page), NR_KERNEL_MISC_RECLAIMABLE,
+ -(1 << pool->order));
return page;
}
diff --git a/include/linux/mmzone.h b/include/linux/mmzone.h
index 32699b2dc52a..c2f6bc4c9e8a 100644
--- a/include/linux/mmzone.h
+++ b/include/linux/mmzone.h
@@ -180,7 +180,7 @@ enum node_stat_item {
NR_VMSCAN_IMMEDIATE, /* Prioritise for reclaim when writeback ends */
NR_DIRTIED, /* page dirtyings since bootup */
NR_WRITTEN, /* page writings since bootup */
- NR_INDIRECTLY_RECLAIMABLE_BYTES, /* measured in bytes */
+ NR_KERNEL_MISC_RECLAIMABLE, /* reclaimable non-slab kernel pages */
NR_VM_NODE_STAT_ITEMS
};
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index 1521100f1e63..8ceb45e11b97 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -4704,6 +4704,7 @@ long si_mem_available(void)
unsigned long pagecache;
unsigned long wmark_low = 0;
unsigned long pages[NR_LRU_LISTS];
+ unsigned long reclaimable;
struct zone *zone;
int lru;
@@ -4729,19 +4730,13 @@ long si_mem_available(void)
available += pagecache;
/*
- * Part of the reclaimable slab consists of items that are in use,
- * and cannot be freed. Cap this estimate at the low watermark.
+ * Part of the reclaimable slab and other kernel memory consists of
+ * items that are in use, and cannot be freed. Cap this estimate at the
+ * low watermark.
*/
- available += global_node_page_state(NR_SLAB_RECLAIMABLE) -
- min(global_node_page_state(NR_SLAB_RECLAIMABLE) / 2,
- wmark_low);
-
- /*
- * Part of the kernel memory, which can be released under memory
- * pressure.
- */
- available += global_node_page_state(NR_INDIRECTLY_RECLAIMABLE_BYTES) >>
- PAGE_SHIFT;
+ reclaimable = global_node_page_state(NR_SLAB_RECLAIMABLE) +
+ global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE);
+ available += reclaimable - min(reclaimable / 2, wmark_low);
if (available < 0)
available = 0;
diff --git a/mm/util.c b/mm/util.c
index 3351659200e6..891f0654e7b5 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -675,8 +675,7 @@ int __vm_enough_memory(struct mm_struct *mm, long pages, int cap_sys_admin)
* Part of the kernel memory, which can be released
* under memory pressure.
*/
- free += global_node_page_state(
- NR_INDIRECTLY_RECLAIMABLE_BYTES) >> PAGE_SHIFT;
+ free += global_node_page_state(NR_KERNEL_MISC_RECLAIMABLE);
/*
* Leave reserved pages. The pages are not for anonymous pages.
diff --git a/mm/vmstat.c b/mm/vmstat.c
index 75eda9c2b260..7c677d3a61ec 100644
--- a/mm/vmstat.c
+++ b/mm/vmstat.c
@@ -1161,7 +1161,7 @@ const char * const vmstat_text[] = {
"nr_vmscan_immediate_reclaim",
"nr_dirtied",
"nr_written",
- "", /* nr_indirectly_reclaimable */
+ "nr_kernel_misc_reclaimable",
/* enum writeback_stat_item counters */
"nr_dirty_threshold",
@@ -1704,10 +1704,6 @@ static int vmstat_show(struct seq_file *m, void *arg)
unsigned long *l = arg;
unsigned long off = l - (unsigned long *)m->private;
- /* Skip hidden vmstat items. */
- if (*vmstat_text[off] == '\0')
- return 0;
-
seq_puts(m, vmstat_text[off]);
seq_put_decimal_ull(m, " ", *l);
seq_putc(m, '\n');
--
2.17.1
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