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surfaceflinger: Trace HW vsync enable

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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
This commit is contained in:
Jesse Hall 2014-08-25 14:44:16 -07:00
parent f00945cfd7
commit 4d407a0f05
1 changed files with 4 additions and 0 deletions
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4
services/surfaceflinger/DisplayHardware/HWComposer.cpp
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@ -524,6 +524,10 @@ void HWComposer::eventControl(int disp, int event, int enabled) {
if (!err) { if (!err) {
int32_t& events(mDisplayData[disp].events); int32_t& events(mDisplayData[disp].events);
events = (events & ~eventBit) | newValue; 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 // error here should not happen -- not sure what we should