Add some test to verify the refcount and fd reference is correct when
the dma_buf is shared between processes.
Bug; 63860998
Test: libdmabufinfo_test
Change-Id: Id22e68e7a65820f19847b2faab11c78e6d942d92
Change the dmabufinfo library to handle multiple references to the same
buffer across PIDs by doing these changes:
- Add function AppendDmaBufInfo: appends the information for a specific
PID to an existing DmaBuffer vector
- Change the way fd/map references to a buffer belonging to a PID are
stored in DmaBuffer from vector<pid_t> to unorderedmap<pid_t, int>
- When parsing proc/%pid/{maps|fds}, look up the buffer by inode and
update the data if found
Test: builds
Bug: 63860998
Change-Id: If22feea772f182086ae3446b46d626a750674b1f
Signed-off-by: Erick Reyes <erickreyes@google.com>
This is the userspace component for the improved shared memory buffer
tracking.
A new static library called libdmabufinfo will provide APIs to parse dmabuf
debugfs entries. The library can also map and read the file descriptors
per process to cross-reference the global data per process.
This change only adds a global API to read dmabuf stats from debugfs.
Bug: 63860998
Test: dmabufinfo_test
Change-Id: Ib0deedc73337a70875e03e07d3e9a692c4c33e63
Signed-off-by: Greg Hackmann <ghackmann@google.com>
Signed-off-by: Erick Reyes <erickreyes@google.com>
Signed-off-by: Sandeep Patil <sspatil@google.com>
