diff options
author | David Rientjes <rientjes@google.com> | 2012-04-09 16:56:18 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-09 20:48:44 -0700 |
commit | 83dbbdbb38666e20a75fad2294cf1df77c52f121 (patch) | |
tree | cfed4ddb4468615cec47e086955672b306f8b993 /scripts/mod | |
parent | 0034102808e0dbbf3a2394b82b1bb40b5778de9e (diff) |
android, lowmemorykiller: remove task handoff notifier
The task handoff notifier leaks task_struct since it never gets freed
after the callback returns NOTIFY_OK, which means it is responsible for
doing so.
It turns out the lowmemorykiller actually doesn't need this notifier at
all. It's used to prevent unnecessary killing by waiting for a thread
to exit as a result of lowmem_shrink(), however, it's possible to do
this in the same way the kernel oom killer works by setting TIF_MEMDIE
and avoid killing if we're still waiting for it to exit.
The kernel oom killer will already automatically set TIF_MEMDIE for
threads that are attempting to allocate memory that have a fatal signal.
The thread selected by lowmem_shrink() will have such a signal after the
lowmemorykiller sends it a SIGKILL, so this won't result in an
unnecessary use of memory reserves for the thread to exit.
This has the added benefit that we don't have to rely on
CONFIG_PROFILING to prevent needlessly killing tasks.
Reported-by: Werner Landgraf <w.landgraf@ru.ru>
Cc: stable@vger.kernel.org
Signed-off-by: David Rientjes <rientjes@google.com>
Acked-by: Colin Cross <ccross@android.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'scripts/mod')
0 files changed, 0 insertions, 0 deletions