Re: [PATCH] dma-buf: Add DmaBufTotal counter in meminfo

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Am 16.04.21 um 11:37 schrieb Peter Enderborg:
This adds a total used dma-buf memory. Details
can be found in debugfs, however it is not for everyone
and not always available.

Well you are kind of missing the intention here.

I mean knowing this is certainly useful in some case, but you need to describe which cases that are.

Christian.


Signed-off-by: Peter Enderborg <peter.enderborg@xxxxxxxx>
---
  drivers/dma-buf/dma-buf.c | 12 ++++++++++++
  fs/proc/meminfo.c         |  2 ++
  include/linux/dma-buf.h   |  1 +
  3 files changed, 15 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index f264b70c383e..9f88171b394c 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -37,6 +37,7 @@ struct dma_buf_list {
  };
static struct dma_buf_list db_list;
+static atomic_long_t dma_buf_size;
static char *dmabuffs_dname(struct dentry *dentry, char *buffer, int buflen)
  {
@@ -79,6 +80,7 @@ static void dma_buf_release(struct dentry *dentry)
  	if (dmabuf->resv == (struct dma_resv *)&dmabuf[1])
  		dma_resv_fini(dmabuf->resv);
+ atomic_long_sub(dmabuf->size, &dma_buf_size);
  	module_put(dmabuf->owner);
  	kfree(dmabuf->name);
  	kfree(dmabuf);
@@ -586,6 +588,7 @@ struct dma_buf *dma_buf_export(const struct dma_buf_export_info *exp_info)
  	mutex_lock(&db_list.lock);
  	list_add(&dmabuf->list_node, &db_list.head);
  	mutex_unlock(&db_list.lock);
+	atomic_long_add(dmabuf->size, &dma_buf_size);
return dmabuf; @@ -1346,6 +1349,15 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
  }
  EXPORT_SYMBOL_GPL(dma_buf_vunmap);
+/**
+ * dma_buf_get_size - Return the used nr pages by dma-buf
+ */
+long dma_buf_get_size(void)
+{
+	return atomic_long_read(&dma_buf_size) >> PAGE_SHIFT;
+}
+EXPORT_SYMBOL_GPL(dma_buf_get_size);
+
  #ifdef CONFIG_DEBUG_FS
  static int dma_buf_debug_show(struct seq_file *s, void *unused)
  {
diff --git a/fs/proc/meminfo.c b/fs/proc/meminfo.c
index 6fa761c9cc78..3c1a82b51a6f 100644
--- a/fs/proc/meminfo.c
+++ b/fs/proc/meminfo.c
@@ -16,6 +16,7 @@
  #ifdef CONFIG_CMA
  #include <linux/cma.h>
  #endif
+#include <linux/dma-buf.h>
  #include <asm/page.h>
  #include "internal.h"
@@ -145,6 +146,7 @@ static int meminfo_proc_show(struct seq_file *m, void *v)
  	show_val_kb(m, "CmaFree:        ",
  		    global_zone_page_state(NR_FREE_CMA_PAGES));
  #endif
+	show_val_kb(m, "DmaBufTotal:    ", dma_buf_get_size());
hugetlb_report_meminfo(m); diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
index efdc56b9d95f..f6481315a377 100644
--- a/include/linux/dma-buf.h
+++ b/include/linux/dma-buf.h
@@ -507,4 +507,5 @@ int dma_buf_mmap(struct dma_buf *, struct vm_area_struct *,
  		 unsigned long);
  int dma_buf_vmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
  void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map);
+long dma_buf_get_size(void);
  #endif /* __DMA_BUF_H__ */

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