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binder: relocate low space calculation

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Move the low async space calculation to debug_low_async_space_locked().
This logic not only fits better here but also offloads some of the many
tasks currently done in binder_alloc_new_buf_locked().

No functional change in this patch.

Reviewed-by: Alice Ryhl <aliceryhl@google.com>
Signed-off-by: Carlos Llamas <cmllamas@google.com>
Link: https://lore.kernel.org/r/20231201172212.1813387-15-cmllamas@google.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Carlos Llamas 2023-12-01 17:21:43 +00:00 committed by Greg Kroah-Hartman
parent 9409af24e4
commit c13500eaab
1 changed files with 11 additions and 10 deletions
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21
drivers/android/binder_alloc.c
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@ -371,6 +371,15 @@ static bool debug_low_async_space_locked(struct binder_alloc *alloc)
size_t num_buffers = 0;
struct rb_node *n;
/*
* Only start detecting spammers once we have less than 20% of async
* space left (which is less than 10% of total buffer size).
*/
if (alloc->free_async_space >= alloc->buffer_size / 10) {
alloc->oneway_spam_detected = false;
return false;
}
for (n = rb_first(&alloc->allocated_buffers); n != NULL;
n = rb_next(n)) {
buffer = rb_entry(n, struct binder_buffer, rb_node);
@ -491,16 +500,8 @@ static struct binder_buffer *binder_alloc_new_buf_locked(
binder_alloc_debug(BINDER_DEBUG_BUFFER_ALLOC_ASYNC,
"%d: binder_alloc_buf size %zd async free %zd\n",
alloc->pid, size, alloc->free_async_space);
if (alloc->free_async_space < alloc->buffer_size / 10) {
/*
* Start detecting spammers once we have less than 20%
* of async space left (which is less than 10% of total
* buffer size).
*/
buffer->oneway_spam_suspect = debug_low_async_space_locked(alloc);
} else {
alloc->oneway_spam_detected = false;
}
if (debug_low_async_space_locked(alloc))
buffer->oneway_spam_suspect = true;
}
return buffer;