linux/drivers/android/binder_alloc.c, branch v4.14

android: binder: Fix null ptr dereference in debug msg

2017-10-21T08:14:20Z

Don't access next->data in kernel debug message when the next buffer is null. Acked-by: Arve Hjønnevåg Signed-off-by: Sherry Yang Signed-off-by: Greg Kroah-Hartman

android: binder: Don't get mm from task

2017-10-21T08:14:20Z

Use binder_alloc struct's mm_struct rather than getting a reference to the mm struct through get_task_mm to avoid a potential deadlock between lru lock, task lock and dentry lock, since a thread can be holding the task lock and the dentry lock while trying to acquire the lru lock. Acked-by: Arve Hjønnevåg Signed-off-by: Sherry Yang Signed-off-by: Greg Kroah-Hartman

android: binder: drop lru lock in isolate callback

2017-10-04T00:54:24Z

Drop the global lru lock in isolate callback before calling zap_page_range which calls cond_resched, and re-acquire the global lru lock before returning. Also change return code to LRU_REMOVED_RETRY. Use mmput_async when fail to acquire mmap sem in an atomic context. Fix "BUG: sleeping function called from invalid context" errors when CONFIG_DEBUG_ATOMIC_SLEEP is enabled. Also restore mmput_async, which was initially introduced in commit ec8d7c14ea14 ("mm, oom_reaper: do not mmput synchronously from the oom reaper context"), and was removed in commit 212925802454 ("mm: oom: let oom_reap_task and exit_mmap run concurrently"). Link: http://lkml.kernel.org/r/20170914182231.90908-1-sherryy@android.com Fixes: f2517eb76f1f2 ("android: binder: Add global lru shrinker to binder") Signed-off-by: Sherry Yang Signed-off-by: Greg Kroah-Hartman Reported-by: Kyle Yan Acked-by: Arve Hjønnevåg Acked-by: Michal Hocko Cc: Martijn Coenen Cc: Todd Kjos Cc: Riley Andrews Cc: Ingo Molnar Cc: Vlastimil Babka Cc: Hillf Danton Cc: Peter Zijlstra Cc: Andrea Arcangeli Cc: Thomas Gleixner Cc: Andy Lutomirski Cc: Oleg Nesterov Cc: Hoeun Ryu Cc: Christopher Lameter Cc: Vegard Nossum Cc: Frederic Weisbecker Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

android: binder: Add page usage in binder stats

2017-09-01T06:53:32Z

Add the number of active, lru, and free pages for each binder process in binder stats Signed-off-by: Sherry Yang Signed-off-by: Greg Kroah-Hartman

android: binder: fixup crash introduced by moving buffer hdr

2017-09-01T06:53:32Z

Fix crash introduced by 74310e06be4d74dcf67cd108366710dee5c576d5 (android: binder: Move buffer out of area shared with user space) when close is called after open without mmap in between. Reported-by: kernel test robot Fixes: 74310e06be4d ("android: binder: Move buffer out of area shared with user space") Signed-off-by: Sherry Yang Signed-off-by: Greg Kroah-Hartman

android: binder: Add shrinker tracepoints

2017-08-28T14:47:17Z

Add tracepoints in binder transaction allocator to record lru hits and alloc/free page. Signed-off-by: Sherry Yang Signed-off-by: Greg Kroah-Hartman

android: binder: Add global lru shrinker to binder

2017-08-28T14:47:17Z

Hold on to the pages allocated and mapped for transaction buffers until the system is under memory pressure. When that happens, use linux shrinker to free pages. Without using shrinker, patch "android: binder: Move buffer out of area shared with user space" will cause a significant slow down for small transactions that fit into the first page because free list buffer header used to be inlined with buffer data. In addition to prevent the performance regression for small transactions, this patch improves the performance for transactions that take up more than one page. Modify alloc selftest to work with the shrinker change. Test: Run memory intensive applications (Chrome and Camera) to trigger shrinker callbacks. Binder frees memory as expected. Test: Run binderThroughputTest with high memory pressure option enabled. Signed-off-by: Sherry Yang Signed-off-by: Greg Kroah-Hartman

android: binder: Move buffer out of area shared with user space

2017-08-28T14:47:17Z

Binder driver allocates buffer meta data in a region that is mapped in user space. These meta data contain pointers in the kernel. This patch allocates buffer meta data on the kernel heap that is not mapped in user space, and uses a pointer to refer to the data mapped. Signed-off-by: Sherry Yang Signed-off-by: Greg Kroah-Hartman

android: binder: Refactor prev and next buffer into a helper function

2017-08-28T14:47:17Z

Use helper functions buffer_next and buffer_prev instead of list_entry to get the next and previous buffers. Signed-off-by: Sherry Yang Signed-off-by: Greg Kroah-Hartman

binder: add more debug info when allocation fails.

2017-07-17T12:47:29Z

Display information about allocated/free space whenever binder buffer allocation fails on synchronous transactions. Signed-off-by: Martijn Coenen Signed-off-by: Siqi Lin Signed-off-by: Greg Kroah-Hartman