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The previous 2.4 Linux kernel maintainer, Marcelo Tossati, resurrected a discussion on adding support for out of memory notifications to the Linux kernel. He explained, "AIX contains the SIGDANGER signal to notify applications to free up some unused cached memory," then noting, "there have been a few discussions on implementing such an idea on Linux, but nothing concrete has been achieved." In a request for discussion, Marcelo added, "on the kernel side Rik suggested two notification points: 'about to swap' (for desktop scenarios) and 'about to OOM' (for embedded-like scenarios)."
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