Use AudioSystem::setLowRamDevice() to configure memory
Bug: 9798886
Change-Id: I9321e3f369f1ed9429ae222e3926ebdeb012b8b0
diff --git a/services/audioflinger/FastMixer.h b/services/audioflinger/FastMixer.h
index 2ab1d04..6158925 100644
--- a/services/audioflinger/FastMixer.h
+++ b/services/audioflinger/FastMixer.h
@@ -85,10 +85,14 @@
// Only POD types are permitted, and the contents shouldn't be trusted (i.e. do range checks).
// It has a different lifetime than the FastMixer, and so it can't be a member of FastMixer.
struct FastMixerDumpState {
- FastMixerDumpState();
+ FastMixerDumpState(
+#ifdef FAST_MIXER_STATISTICS
+ uint32_t samplingN = kSamplingNforLowRamDevice
+#endif
+ );
/*virtual*/ ~FastMixerDumpState();
- void dump(int fd); // should only be called on a stable copy, not the original
+ void dump(int fd) const; // should only be called on a stable copy, not the original
FastMixerState::Command mCommand; // current command
uint32_t mWriteSequence; // incremented before and after each write()
@@ -106,8 +110,15 @@
#ifdef FAST_MIXER_STATISTICS
// Recently collected samples of per-cycle monotonic time, thread CPU time, and CPU frequency.
- // kSamplingN is the size of the sampling frame, and must be a power of 2 <= 0x8000.
+ // kSamplingN is max size of sampling frame (statistics), and must be a power of 2 <= 0x8000.
+ // The sample arrays are virtually allocated based on this compile-time constant,
+ // but are only initialized and used based on the runtime parameter mSamplingN.
static const uint32_t kSamplingN = 0x8000;
+ // Compile-time constant for a "low RAM device", must be a power of 2 <= kSamplingN.
+ // This value was chosen such that each array uses 1 small page (4 Kbytes).
+ static const uint32_t kSamplingNforLowRamDevice = 0x400;
+ // Corresponding runtime maximum size of sample arrays, must be a power of 2 <= kSamplingN.
+ uint32_t mSamplingN;
// The bounds define the interval of valid samples, and are represented as follows:
// newest open (excluded) endpoint = lower 16 bits of bounds, modulo N
// oldest closed (included) endpoint = upper 16 bits of bounds, modulo N
@@ -119,6 +130,8 @@
#ifdef CPU_FREQUENCY_STATISTICS
uint32_t mCpukHz[kSamplingN]; // absolute CPU clock frequency in kHz, bits 0-3 are CPU#
#endif
+ // Increase sampling window after construction, must be a power of 2 <= kSamplingN
+ void increaseSamplingN(uint32_t samplingN);
#endif
};