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ANDROID: signal: Add vendor hook for memory reaping

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Add vendor hook to determine if the memory of a process that received
the SIGKILL can be reaped.

Bug: 189803002
Change-Id: Ie6802b9bf93ddffb0ceef615d7cca40c23219e57
Signed-off-by: Charan Teja Reddy <charante@codeaurora.org>
This commit is contained in:
Charan Teja Reddy
2021-06-02 17:33:03 +05:30
committed by Suren Baghdasaryan
parent 3f491d10dc
commit 3bcdb496f4
5 changed files with 47 additions and 7 deletions
Download Patch File Download Diff File Expand all files Collapse all files

1
drivers/android/vendor_hooks.c
View File

@@ -83,6 +83,7 @@ EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_set_priority);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_restore_priority);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_binder_wakeup_ilocked);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_do_send_sig_info);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_process_killed);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_init);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_wake);
EXPORT_TRACEPOINT_SYMBOL_GPL(android_vh_rwsem_write_finished);

3
include/linux/oom.h
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@@ -129,4 +129,7 @@ extern struct task_struct *find_lock_task_mm(struct task_struct *p);
extern int sysctl_oom_dump_tasks;
extern int sysctl_oom_kill_allocating_task;
extern int sysctl_panic_on_oom;
/* call for adding killed process to reaper. */
extern void add_to_oom_reaper(struct task_struct *p);
#endif /* _INCLUDE_LINUX_OOM_H */

3
include/trace/hooks/signal.h
View File

@@ -12,6 +12,9 @@ struct task_struct;
DECLARE_HOOK(android_vh_do_send_sig_info,
TP_PROTO(int sig, struct task_struct *killer, struct task_struct *dst),
TP_ARGS(sig, killer, dst));
DECLARE_HOOK(android_vh_process_killed,
TP_PROTO(struct task_struct *task, bool *reap),
TP_ARGS(task, reap));
#endif /* _TRACE_HOOK_SIGNAL_H */
/* This part must be outside protection */
#include <trace/define_trace.h>

11
kernel/signal.c
View File

@@ -46,6 +46,7 @@
#include <linux/livepatch.h>
#include <linux/cgroup.h>
#include <linux/audit.h>
#include <linux/oom.h>
#define CREATE_TRACE_POINTS
#include <trace/events/signal.h>
@@ -1413,8 +1414,16 @@ int group_send_sig_info(int sig, struct kernel_siginfo *info,
ret = check_kill_permission(sig, info, p);
rcu_read_unlock();
if (!ret && sig)
if (!ret && sig) {
ret = do_send_sig_info(sig, info, p, type);
if (!ret && sig == SIGKILL) {
bool reap = false;
trace_android_vh_process_killed(current, &reap);
if (reap)
add_to_oom_reaper(p);
}
}
return ret;
}

36
mm/oom_kill.c
View File

@@ -724,6 +724,20 @@ static inline void wake_oom_reaper(struct task_struct *tsk)
}
#endif /* CONFIG_MMU */
/**
* tsk->mm has to be non NULL and caller has to guarantee it is stable (either
* under task_lock or operate on the current).
*/
static void __mark_oom_victim(struct task_struct *tsk)
{
struct mm_struct *mm = tsk->mm;
if (!cmpxchg(&tsk->signal->oom_mm, NULL, mm)) {
mmgrab(tsk->signal->oom_mm);
set_bit(MMF_OOM_VICTIM, &mm->flags);
}
}
/**
* mark_oom_victim - mark the given task as OOM victim
* @tsk: task to mark
@@ -736,18 +750,13 @@ static inline void wake_oom_reaper(struct task_struct *tsk)
*/
static void mark_oom_victim(struct task_struct *tsk)
{
struct mm_struct *mm = tsk->mm;
WARN_ON(oom_killer_disabled);
/* OOM killer might race with memcg OOM */
if (test_and_set_tsk_thread_flag(tsk, TIF_MEMDIE))
return;
/* oom_mm is bound to the signal struct life time. */
if (!cmpxchg(&tsk->signal->oom_mm, NULL, mm)) {
mmgrab(tsk->signal->oom_mm);
set_bit(MMF_OOM_VICTIM, &mm->flags);
}
__mark_oom_victim(tsk);
/*
* Make sure that the task is woken up from uninterruptible sleep
@@ -1185,3 +1194,18 @@ void pagefault_out_of_memory(void)
out_of_memory(&oc);
mutex_unlock(&oom_lock);
}
void add_to_oom_reaper(struct task_struct *p)
{
p = find_lock_task_mm(p);
if (!p)
return;
get_task_struct(p);
if (task_will_free_mem(p)) {
__mark_oom_victim(p);
wake_oom_reaper(p);
}
task_unlock(p);
put_task_struct(p);
}