On 22-Feb-21 10:41 AM, Roy Shterman wrote:
When using huge_unlink we unlink the segment right after allocation. Although we unlink the file we keep the fd in fd_list so file still exist just the path deleted. When freeing the hugepage we need to close the fd and assign it with (-1) in fd_list for the page to be released.The current flow fails rte_malloc in the following flow when working with --huge-unlink option: 1. alloc_seg() for segment A - We allocate segment, unlink the path to the segment and keep the file descriptor in fd_list. 2. free_seg() for segment A - We clear the segment metadata and return - without closing fd or assigning (-1) in fd list. 3. alloc_seg() for segment A again - We find segment A as available, try to allocate it, find the old fd in fd_list try to unlink it as part of alloc_seg() but failed because path doesn't exist. The impact of such error is falsly failing rte_malloc() although we have hugepages available. Fixes: d435aad37da7 ("mem: support --huge-unlink mode") Signed-off-by: Roy Shterman <[email protected]> ---
Acked-by: Anatoly Burakov <[email protected]> -- Thanks, Anatoly
