Re: [PATCH v4] dma-buf: Add DmaBufTotal counter in meminfo

[Daniel Vetter]

On Sat, Apr 17, 2021 at 01:54:08PM +0200, Christian König wrote:
> Am 17.04.21 um 13:20 schrieb Peter.Enderborg@xxxxxxxx:
> > On 4/17/21 12:59 PM, Christian König wrote:
> > > Am 17.04.21 um 12:40 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. dma-buf are indirect allocated by
> > > > userspace. So with this value we can monitor and detect
> > > > userspace applications that have problems.
> > > > 
> > > > Signed-off-by: Peter Enderborg <peter.enderborg@xxxxxxxx>
> > > Reviewed-by: Christian König <christian.koenig@xxxxxxx>
> > > 
> > > How do you want to upstream this?
> > I don't understand that question. The patch applies on Torvalds 5.12-rc7,
> > but I guess 5.13 is what we work on right now.
> 
> Yeah, but how do you want to get it into Linus tree?
> 
> I can push it together with other DMA-buf patches through drm-misc-next and
> then Dave will send it to Linus for inclusion in 5.13.

Small correction, we've already frozen for the merge window so this will
land in 5.14.
-Daniel

> 
> But could be that you are pushing multiple changes towards Linus through
> some other branch. In this case I'm fine if you pick that way instead if you
> want to keep your patches together for some reason.
> 
> Christian.
> 
> > 
> > > > ---
> > > >    drivers/dma-buf/dma-buf.c | 13 +++++++++++++
> > > >    fs/proc/meminfo.c         |  5 ++++-
> > > >    include/linux/dma-buf.h   |  1 +
> > > >    3 files changed, 18 insertions(+), 1 deletion(-)
> > > > 
> > > > diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
> > > > index f264b70c383e..197e5c45dd26 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_global_allocated;
> > > >      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_global_allocated);
> > > >        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_global_allocated);
> > > >          return dmabuf;
> > > >    @@ -1346,6 +1349,16 @@ void dma_buf_vunmap(struct dma_buf *dmabuf, struct dma_buf_map *map)
> > > >    }
> > > >    EXPORT_SYMBOL_GPL(dma_buf_vunmap);
> > > >    +/**
> > > > + * dma_buf_allocated_pages - Return the used nr of pages
> > > > + * allocated for dma-buf
> > > > + */
> > > > +long dma_buf_allocated_pages(void)
> > > > +{
> > > > +    return atomic_long_read(&dma_buf_global_allocated) >> PAGE_SHIFT;
> > > > +}
> > > > +EXPORT_SYMBOL_GPL(dma_buf_allocated_pages);
> > > > +
> > > >    #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..ccc7c40c8db7 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"
> > > >    @@ -145,7 +146,9 @@ 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
> > > > -
> > > > +#ifdef CONFIG_DMA_SHARED_BUFFER
> > > > +    show_val_kb(m, "DmaBufTotal:    ", dma_buf_allocated_pages());
> > > > +#endif
> > > >        hugetlb_report_meminfo(m);
> > > >          arch_report_meminfo(m);
> > > > diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h
> > > > index efdc56b9d95f..5b05816bd2cd 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_allocated_pages(void);
> > > >    #endif /* __DMA_BUF_H__ */
> 
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-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch