The patch titled
Subject: mm: add /sys/kernel/slab/cache/cache_dma32
has been added to the -mm tree. Its filename is
mm-add-sys-kernel-slab-cache-cache_dma32.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/mm-add-sys-kernel-slab-cache-cache_dma32.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-sys-kernel-slab-cache-cache_dma32.patch
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*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
Subject: mm: add /sys/kernel/slab/cache/cache_dma32
A previous patch in this series adds support for SLAB_CACHE_DMA32 kmem
caches. This adds the corresponding /sys/kernel/slab/cache/cache_dma32
entries, and fixes slabinfo tool.
Link: http://lkml.kernel.org/r/20181210011504.122604-4-drinkcat@xxxxxxxxxxxx
Signed-off-by: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: David Rientjes <rientjes@xxxxxxxxxx>
Cc: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx>
Cc: Huaisheng Ye <yehs1@xxxxxxxxxx>
Cc: Joerg Roedel <joro@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Matthias Brugger <matthias.bgg@xxxxxxxxx>
Cc: Mel Gorman <mgorman@xxxxxxxxxxxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxx>
Cc: Mike Rapoport <rppt@xxxxxxxxxxxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Robin Murphy <robin.murphy@xxxxxxx>
Cc: Sasha Levin <Alexander.Levin@xxxxxxxxxxxxx>
Cc: Tomasz Figa <tfiga@xxxxxxxxxx>
Cc: Vlastimil Babka <vbabka@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
Cc: Yingjoe Chen <yingjoe.chen@xxxxxxxxxxxx>
Cc: Yong Wu <yong.wu@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
Documentation/ABI/testing/sysfs-kernel-slab | 9 +++++++++
mm/slub.c | 11 +++++++++++
tools/vm/slabinfo.c | 7 ++++++-
3 files changed, 26 insertions(+), 1 deletion(-)
--- a/Documentation/ABI/testing/sysfs-kernel-slab~mm-add-sys-kernel-slab-cache-cache_dma32
+++ a/Documentation/ABI/testing/sysfs-kernel-slab
@@ -106,6 +106,15 @@ Description:
are from ZONE_DMA.
Available when CONFIG_ZONE_DMA is enabled.
+What: /sys/kernel/slab/cache/cache_dma32
+Date: December 2018
+KernelVersion: 4.21
+Contact: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
+Description:
+ The cache_dma32 file is read-only and specifies whether objects
+ are from ZONE_DMA32.
+ Available when CONFIG_ZONE_DMA32 is enabled.
+
What: /sys/kernel/slab/cache/cpu_slabs
Date: May 2007
KernelVersion: 2.6.22
--- a/mm/slub.c~mm-add-sys-kernel-slab-cache-cache_dma32
+++ a/mm/slub.c
@@ -5112,6 +5112,14 @@ static ssize_t cache_dma_show(struct kme
SLAB_ATTR_RO(cache_dma);
#endif
+#ifdef CONFIG_ZONE_DMA32
+static ssize_t cache_dma32_show(struct kmem_cache *s, char *buf)
+{
+ return sprintf(buf, "%d\n", !!(s->flags & SLAB_CACHE_DMA32));
+}
+SLAB_ATTR_RO(cache_dma32);
+#endif
+
static ssize_t usersize_show(struct kmem_cache *s, char *buf)
{
return sprintf(buf, "%u\n", s->usersize);
@@ -5452,6 +5460,9 @@ static struct attribute *slab_attrs[] =
#ifdef CONFIG_ZONE_DMA
&cache_dma_attr.attr,
#endif
+#ifdef CONFIG_ZONE_DMA32
+ &cache_dma32_attr.attr,
+#endif
#ifdef CONFIG_NUMA
&remote_node_defrag_ratio_attr.attr,
#endif
--- a/tools/vm/slabinfo.c~mm-add-sys-kernel-slab-cache-cache_dma32
+++ a/tools/vm/slabinfo.c
@@ -29,7 +29,7 @@ struct slabinfo {
char *name;
int alias;
int refs;
- int aliases, align, cache_dma, cpu_slabs, destroy_by_rcu;
+ int aliases, align, cache_dma, cache_dma32, cpu_slabs, destroy_by_rcu;
unsigned int hwcache_align, object_size, objs_per_slab;
unsigned int sanity_checks, slab_size, store_user, trace;
int order, poison, reclaim_account, red_zone;
@@ -534,6 +534,8 @@ static void report(struct slabinfo *s)
printf("** Hardware cacheline aligned\n");
if (s->cache_dma)
printf("** Memory is allocated in a special DMA zone\n");
+ if (s->cache_dma32)
+ printf("** Memory is allocated in a special DMA32 zone\n");
if (s->destroy_by_rcu)
printf("** Slabs are destroyed via RCU\n");
if (s->reclaim_account)
@@ -602,6 +604,8 @@ static void slabcache(struct slabinfo *s
*p++ = '*';
if (s->cache_dma)
*p++ = 'd';
+ if (s->cache_dma32)
+ *p++ = 'D';
if (s->hwcache_align)
*p++ = 'A';
if (s->poison)
@@ -1208,6 +1212,7 @@ static void read_slab_dir(void)
slab->aliases = get_obj("aliases");
slab->align = get_obj("align");
slab->cache_dma = get_obj("cache_dma");
+ slab->cache_dma32 = get_obj("cache_dma32");
slab->cpu_slabs = get_obj("cpu_slabs");
slab->destroy_by_rcu = get_obj("destroy_by_rcu");
slab->hwcache_align = get_obj("hwcache_align");
_
Patches currently in -mm which might be from drinkcat@xxxxxxxxxxxx are
mm-add-support-for-kmem-caches-in-dma32-zone.patch
iommu-io-pgtable-arm-v7s-request-dma32-memory-and-improve-debugging.patch
mm-add-sys-kernel-slab-cache-cache_dma32.patch
