Re: + mm-add-sys-kernel-slab-cache-cache_dma32.patch added to -mm tree

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This patch is presently in limbo.   Should we just drop it?


From: Nicolas Boichat <drinkcat@xxxxxxxxxxxx>
Subject: mm: add /sys/kernel/slab/cache/cache_dma32

The patch "mm: add support for kmem caches in DMA32 zone" added support
for SLAB_CACHE_DMA32 kmem caches.  This patch adds the corresponding
/sys/kernel/slab/cache/cache_dma32 entries, and updates the 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");
_




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