Rik van Riel a écrit :
Make it possible for applications to have the kernel free memory
lazily. This reduces a repeated free/malloc cycle from freeing
pages and allocating them, to just marking them freeable. If the
application wants to reuse them before the kernel needs the memory,
not even a page fault will happen.
Hi Rik
I dont understand this last sentence. If not even a page fault happens, how
the kernel knows that the page was eventually reused by the application, and
should not be freed in case of memory pressure ?
ptr = mmap(some space);
madvise(ptr, length, MADV_FREE);
/* kernel may free the pages */
sleep(10);
/* what the application must do know before reusing space ? */
memset(ptr, data, 10000);
/* kernel should not free ptr[0..10000] now */
Thank you
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