linux-kernel - [PATCH 05/14] dma-buf: provide file RSS for DMA-buf files

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Message-Id: <20220624080444.7619-6-christian.koenig@amd.com>
Date:   Fri, 24 Jun 2022 10:04:35 +0200
From:   "Christian König" 
        <ckoenig.leichtzumerken@...il.com>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        intel-gfx@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
        nouveau@...ts.freedesktop.org, linux-tegra@...r.kernel.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        dri-devel@...ts.freedesktop.org
Cc:     mhocko@...e.com,
        Christian König <christian.koenig@....com>
Subject: [PATCH 05/14] dma-buf: provide file RSS for DMA-buf files

Just return the size of the DMA-buf in pages since pages allocated or
mapped through DMA-bufs are usually not accounted elsewhere.

Signed-off-by: Christian König <christian.koenig@....com>
---
 drivers/dma-buf/dma-buf.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c
index 630133284e2b..16162ec3538c 100644
--- a/drivers/dma-buf/dma-buf.c
+++ b/drivers/dma-buf/dma-buf.c
@@ -494,6 +494,11 @@ static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file)
 	spin_unlock(&dmabuf->name_lock);
 }
 
+static long dma_buf_file_rss(struct file *file)
+{
+	return i_size_read(file_inode(file)) >> PAGE_SHIFT;
+}
+
 static const struct file_operations dma_buf_fops = {
 	.release	= dma_buf_file_release,
 	.mmap		= dma_buf_mmap_internal,
@@ -502,6 +507,7 @@ static const struct file_operations dma_buf_fops = {
 	.unlocked_ioctl	= dma_buf_ioctl,
 	.compat_ioctl	= compat_ptr_ioctl,
 	.show_fdinfo	= dma_buf_show_fdinfo,
+	.file_rss	= dma_buf_file_rss,
 };
 
 /*
-- 
2.25.1