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Merge "libprocessgroup: Remove prctl interface for setting timer slack" into main

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Treehugger Robot 2024-10-09 19:54:07 +00:00 • committed by Gerrit Code Review
commit cd2475ccf6
2 changed files with 7 additions and 27 deletions
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32
libprocessgroup/task_profiles.cpp
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@ -203,33 +203,15 @@ bool SetClampsAction::ExecuteForTask(int) const {
// To avoid issues in sdk_mac build
#if defined(__ANDROID__)
bool SetTimerSlackAction::IsTimerSlackSupported(pid_t tid) {
auto file = StringPrintf("/proc/%d/timerslack_ns", tid);
return (access(file.c_str(), W_OK) == 0);
}
bool SetTimerSlackAction::ExecuteForTask(pid_t tid) const {
static bool sys_supports_timerslack = IsTimerSlackSupported(tid);
// v4.6+ kernels support the /proc/<tid>/timerslack_ns interface.
// TODO: once we've backported this, log if the open(2) fails.
if (sys_supports_timerslack) {
auto file = StringPrintf("/proc/%d/timerslack_ns", tid);
if (!WriteStringToFile(std::to_string(slack_), file)) {
if (errno == ENOENT) {
// This happens when process is already dead
return true;
}
PLOG(ERROR) << "set_timerslack_ns write failed";
}
}
// TODO: Remove when /proc/<tid>/timerslack_ns interface is backported.
if (tid == 0 || tid == GetThreadId()) {
if (prctl(PR_SET_TIMERSLACK, slack_) == -1) {
PLOG(ERROR) << "set_timerslack_ns prctl failed";
const auto file = StringPrintf("/proc/%d/timerslack_ns", tid);
if (!WriteStringToFile(std::to_string(slack_), file)) {
if (errno == ENOENT) {
// This happens when process is already dead
return true;
}
PLOG(ERROR) << "set_timerslack_ns write failed";
return false;
}
return true;

2
libprocessgroup/task_profiles.h
View file

@ -114,8 +114,6 @@ class SetTimerSlackAction : public ProfileAction {
private:
unsigned long slack_;
static bool IsTimerSlackSupported(pid_t tid);
};
// Set attribute profile element