xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ANDROID: Delete the DMA-BUF attachment sysfs statistics

Browse Source 
The overhead of sysfs directory creation/teardown during
dma_buf_attach()/dma_buf_detach() is causing perf regressions for
certain drivers.

Bug: 192621117
Change-Id: I908aa3b2717bf2e183628be3446e0069ce24c68a
Fixes: 621f94a601 (BACKPORT: FROMLIST: dmabuf: Add the capability to
expose DMA-BUF stats in sysfs)
Signed-off-by: Hridya Valsaraju <hridya@google.com>
This commit is contained in:
Hridya Valsaraju
2021-07-07 17:50:24 -07:00
committed by Todd Kjos
parent a2b3afb2f7
commit a1ce719ca7
5 changed files with 0 additions and 211 deletions
Download Patch File Download Diff File Expand all files Collapse all files

12
include/linux/dma-buf.h
View File

@@ -383,8 +383,6 @@ struct dma_buf_ops {
* @cb_excl: for userspace poll support
* @cb_shared: for userspace poll support
* @sysfs_entry: for exposing information about this buffer in sysfs.
* The attachment_uid member of @sysfs_entry is protected by dma_resv lock
* and is incremented on each attach.
*
* This represents a shared buffer, created by calling dma_buf_export(). The
* userspace representation is a normal file descriptor, which can be created by
@@ -425,8 +423,6 @@ struct dma_buf {
struct dma_buf_sysfs_entry {
struct kobject kobj;
struct dma_buf *dmabuf;
unsigned int attachment_uid;
struct kset *attach_stats_kset;
} *sysfs_entry;
#endif
@@ -483,7 +479,6 @@ struct dma_buf_attach_ops {
* @importer_priv: importer specific attachment data.
* @dma_map_attrs: DMA attributes to be used when the exporter maps the buffer
* through dma_buf_map_attachment.
* @sysfs_entry: For exposing information about this attachment in sysfs.
*
* This structure holds the attachment information between the dma_buf buffer
* and its user device(s). The list contains one attachment struct per device
@@ -505,13 +500,6 @@ struct dma_buf_attachment {
void *importer_priv;
void *priv;
unsigned long dma_map_attrs;
#ifdef CONFIG_DMABUF_SYSFS_STATS
/* for sysfs stats */
struct dma_buf_attach_sysfs_entry {
struct kobject kobj;
unsigned int map_counter;
} *sysfs_entry;
#endif
ANDROID_KABI_RESERVE(1);
ANDROID_KABI_RESERVE(2);