binder: add more debug info when allocation fails.

Display information about allocated/free space whenever
binder buffer allocation fails on synchronous
transactions.

Signed-off-by: Martijn Coenen <maco@android.com>
Signed-off-by: Siqi Lin <siqilin@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

1 files changed, 30 insertions, 1 deletions

diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 2a2e41b13de5..40f31df60580 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -337,8 +337,36 @@ struct binder_buffer *binder_alloc_new_buf_locked(struct binder_alloc *alloc,
                 }
         }
         if (best_fit == NULL) {
+                size_t allocated_buffers = 0;
+                size_t largest_alloc_size = 0;
+                size_t total_alloc_size = 0;
+                size_t free_buffers = 0;
+                size_t largest_free_size = 0;
+                size_t total_free_size = 0;
+
+                for (n = rb_first(&alloc->allocated_buffers); n != NULL;
+                     n = rb_next(n)) {
+                        buffer = rb_entry(n, struct binder_buffer, rb_node);
+                        buffer_size = binder_alloc_buffer_size(alloc, buffer);
+                        allocated_buffers++;
+                        total_alloc_size += buffer_size;
+                        if (buffer_size > largest_alloc_size)
+                                largest_alloc_size = buffer_size;
+                }
+                for (n = rb_first(&alloc->free_buffers); n != NULL;
+                     n = rb_next(n)) {
+                        buffer = rb_entry(n, struct binder_buffer, rb_node);
+                        buffer_size = binder_alloc_buffer_size(alloc, buffer);
+                        free_buffers++;
+                        total_free_size += buffer_size;
+                        if (buffer_size > largest_free_size)
+                                largest_free_size = buffer_size;
+                }
                 pr_err("%d: binder_alloc_buf size %zd failed, no address space\n",
                         alloc->pid, size);
+                pr_err("allocated: %zd (num: %zd largest: %zd), free: %zd (num: %zd largest: %zd)\n",
+                       total_alloc_size, allocated_buffers, largest_alloc_size,
+                       total_free_size, free_buffers, largest_free_size);
                 return ERR_PTR(-ENOSPC);
         }
         if (n == NULL) {
@@ -698,9 +726,10 @@ void binder_alloc_deferred_release(struct binder_alloc *alloc)
 static void print_binder_buffer(struct seq_file *m, const char *prefix,
                                 struct binder_buffer *buffer)
 {
-        seq_printf(m, "%s %d: %pK size %zd:%zd %s\n",
+        seq_printf(m, "%s %d: %pK size %zd:%zd:%zd %s\n",
                    prefix, buffer->debug_id, buffer->data,
                    buffer->data_size, buffer->offsets_size,
+                   buffer->extra_buffers_size,
                    buffer->transaction ? "active" : "delivered");
 }