Add support for signal dumping log stats.
Adding the new option log_allocator_stats_on_signal that will call
mallopt(M_LOG_STATS, 0), when a signal is sent to a process.
This call does not happen in the signal handler, but a variable
is set to trigger the mallopt call. The next time any allocation
call occurs, the mallopt call will be made.
Also, includes new unit tests for the new config option.
Test: All unit tests pass.
Test: Enabling the new feature and stop/start and sending the signal to
Test: a process and observing the log contains the memory stats.
Test: Did the above for a scudo and jemalloc based device.
Change-Id: Idcf6fca74036efb065b9c4cc037aaf9bcf0f139e
diff --git a/libc/malloc_debug/Config.h b/libc/malloc_debug/Config.h
index ef1d2a9..754970f 100644
--- a/libc/malloc_debug/Config.h
+++ b/libc/malloc_debug/Config.h
@@ -48,6 +48,7 @@
constexpr uint64_t VERBOSE = 0x1000;
constexpr uint64_t CHECK_UNREACHABLE_ON_SIGNAL = 0x2000;
constexpr uint64_t BACKTRACE_SPECIFIC_SIZES = 0x4000;
+constexpr uint64_t LOG_ALLOCATOR_STATS_ON_SIGNAL = 0x8000;
// In order to guarantee posix compliance, set the minimum alignment
// to 8 bytes for 32 bit systems and 16 bytes for 64 bit systems.
@@ -100,6 +101,8 @@
int check_unreachable_signal() const { return check_unreachable_signal_; }
+ int log_allocator_stats_signal() const { return log_allocator_stats_signal_; }
+
private:
struct OptionInfo {
uint64_t option;
@@ -175,4 +178,5 @@
uint8_t rear_guard_value_;
int check_unreachable_signal_ = 0;
+ int log_allocator_stats_signal_ = 0;
};