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Commit 4d407a0f authored by Jesse Hall's avatar Jesse Hall
Browse files

surfaceflinger: Trace HW vsync enable 

This makes it possible to tell whether two HW vsync signals are too
far apart because one was late, or because we turned HW vsync off
briefly between them.

Bug: 17259382
Change-Id: If4fba2a8a6013568349949ce87c5c36f0468d2a2
parent f00945cf

services/surfaceflinger/DisplayHardware/HWComposer.cpp

+4 −0
Original line number Diff line number Diff line
@@ -524,6 +524,10 @@ void HWComposer::eventControl(int disp, int event, int enabled) { 
            if (!err) {

                int32_t& events(mDisplayData[disp].events);

                events = (events & ~eventBit) | newValue;



                char tag[16];

                snprintf(tag, sizeof(tag), "HW_VSYNC_ON_%1u", disp);

                ATRACE_INT(tag, enabled);

            }

        }

        // error here should not happen -- not sure what we should