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staging: android: lowmemorykiller: Don't try to kill the same pid over and over 

Under certain circumstances, a process can take awhile to
handle a sig-kill (especially if it's in a scheduler group with
a very low share ratio). When this occurs, lowmemkiller returns
to vmscan indicating the process memory has been freed - even
though the process is still waiting to die. Since the memory
hasn't actually freed, lowmemkiller is called again shortly after,
and picks the same process to die; regardless of the fact that
it has already been 'scheduled' to die and the memory has already
been reported to vmscan as having been freed.

  Solution is to check fatal_signal_pending() on the selected
task, and if it's already pending destruction return; indicating
to vmscan that no resources were freed on this pass.

Signed-off-by: San Mehat <san@google.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
San Mehat 2010-04-26 15:11:04 -07:00 committed by Greg Kroah-Hartman
parent 3c762a49b1
commit 4964cd41cd
1 changed files with 6 additions and 0 deletions
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6
drivers/staging/android/lowmemorykiller.c
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@ -133,6 +133,12 @@ static int lowmem_shrink(int nr_to_scan, gfp_t gfp_mask)
p->pid, p->comm, oom_adj, tasksize);
}
if (selected) {
if (fatal_signal_pending(selected)) {
pr_warning("process %d is suffering a slow death\n",
selected->pid);
read_unlock(&tasklist_lock);
return rem;
}
lowmem_print(1, "send sigkill to %d (%s), adj %d, size %d\n",
selected->pid, selected->comm,
selected_oom_adj, selected_tasksize);