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platform_system_core
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adbd: reduce queue depths. 

Each operation we submit results in a contiguous allocation in the
kernel which can trigger OOM-killing. Tune the queue depths to reduce
the chances of this happening, with a minimal impact on performance.

Bug: http://b/126582877
Test: ./benchmark_device.py with blueline
Change-Id: I4b0f83d54a9a9a69f0ab48322d78fb137c94dd35
This commit is contained in:
Josh Gao 2019-04-24 14:28:25 -07:00
parent 4d89dc0f54
commit 28293f16a8
1 changed files with 4 additions and 2 deletions
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6
adb/daemon/usb.cpp
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@ -58,10 +58,12 @@ using android::base::StringPrintf;
static std::optional<bool> gFfsAioSupported;
// Not all USB controllers support operations larger than 16k, so don't go above that.
static constexpr size_t kUsbReadQueueDepth = 32;
// Also, each submitted operation does an allocation in the kernel of that size, so we want to
// minimize our queue depth while still maintaining a deep enough queue to keep the USB stack fed.
static constexpr size_t kUsbReadQueueDepth = 8;
static constexpr size_t kUsbReadSize = 4 * PAGE_SIZE;
static constexpr size_t kUsbWriteQueueDepth = 32;
static constexpr size_t kUsbWriteQueueDepth = 8;
static constexpr size_t kUsbWriteSize = 4 * PAGE_SIZE;
static const char* to_string(enum usb_functionfs_event_type type) {