Show the high watermark of the index into the alloc->pages
array, to facilitate sizing the buffer on a per-process
basis.
Signed-off-by: Martijn Coenen <m...@android.com>
---
drivers/android/binder_alloc.c | 4 ++++
drivers/android/binder_alloc.h | 2 ++
2 files changed, 6 insertions(+)
diff --git a/drivers/android/binder_alloc.c b/drivers/android/binder_alloc.c
index 6f6f745605af..0dba2308125c 100644
--- a/drivers/android/binder_alloc.c
+++ b/drivers/android/binder_alloc.c
@@ -281,6 +281,9 @@ static int binder_update_page_range(struct binder_alloc
*alloc, int allocate,
goto err_vm_insert_page_failed;
}
+ if (index + 1 > alloc->pages_high)
+ alloc->pages_high = index + 1;
+
trace_binder_alloc_page_end(alloc, index);
/* vm_insert_page does not seem to increment the refcount */
}
@@ -853,6 +856,7 @@ void binder_alloc_print_pages(struct seq_file *m,
}
mutex_unlock(&alloc->mutex);
seq_printf(m, " pages: %d:%d:%d\n", active, lru, free);
+ seq_printf(m, " pages high watermark: %zu\n", alloc->pages_high);
}
/**
diff --git a/drivers/android/binder_alloc.h b/drivers/android/binder_alloc.h
index 2dd33b6df104..0b145307f1fd 100644
--- a/drivers/android/binder_alloc.h
+++ b/drivers/android/binder_alloc.h
@@ -92,6 +92,7 @@ struct binder_lru_page {
* @pages: array of binder_lru_page
* @buffer_size: size of address space specified via mmap
* @pid: pid for associated binder_proc (invariant after init)
+ * @pages_high: high watermark of offset in @pages
*
* Bookkeeping structure for per-proc address space management for binder
* buffers. It is normally initialized during binder_init() and binder_mmap()
@@ -112,6 +113,7 @@ struct binder_alloc {
size_t buffer_size;
uint32_t buffer_free;
int pid;
+ size_t pages_high;
};
#ifdef CONFIG_ANDROID_BINDER_IPC_SELFTEST
--
2.15.0.448.gf294e3d99a-goog
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