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_... and later at http://ozlabs.org/~akpm/mmotm/broken-out/mm-add-sys-kernel-slab-cache-cache_...
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------------------------------------------------------ From: Nicolas Boichat drinkcat@chromium.org 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@chromium.org Signed-off-by: Nicolas Boichat drinkcat@chromium.org Cc: Christoph Hellwig hch@infradead.org Cc: Christoph Lameter cl@linux.com Cc: David Rientjes rientjes@google.com Cc: Hsin-Yi Wang hsinyi@chromium.org Cc: Huaisheng Ye yehs1@lenovo.com Cc: Joerg Roedel joro@8bytes.org Cc: Joonsoo Kim iamjoonsoo.kim@lge.com Cc: Matthew Wilcox willy@infradead.org Cc: Matthias Brugger matthias.bgg@gmail.com Cc: Mel Gorman mgorman@techsingularity.net Cc: Michal Hocko mhocko@suse.com Cc: Mike Rapoport rppt@linux.vnet.ibm.com Cc: Pekka Enberg penberg@kernel.org Cc: Robin Murphy robin.murphy@arm.com Cc: Sasha Levin Alexander.Levin@microsoft.com Cc: Tomasz Figa tfiga@google.com Cc: Vlastimil Babka vbabka@suse.cz Cc: Will Deacon will.deacon@arm.com Cc: Yingjoe Chen yingjoe.chen@mediatek.com Cc: Yong Wu yong.wu@mediatek.com Cc: stable@vger.kernel.org Signed-off-by: Andrew Morton akpm@linux-foundation.org ---
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@chromium.org +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@chromium.org 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