This patch clarifies the definition of MF_DELAYED to represent cases where a folio's removal is initiated but not immediately completed (e.g., due to remaining metadata references).
Signed-off-by: Lisa Wang <[email protected]> --- mm/memory-failure.c | 15 ++++++++------- 1 file changed, 8 insertions(+), 7 deletions(-) diff --git a/mm/memory-failure.c b/mm/memory-failure.c index ee42d4361309..2e53b3024391 100644 --- a/mm/memory-failure.c +++ b/mm/memory-failure.c @@ -849,24 +849,25 @@ static int kill_accessing_process(struct task_struct *p, unsigned long pfn, } /* - * MF_IGNORED - The m-f() handler marks the page as PG_hwpoisoned'ed. + * MF_IGNORED - The m-f() handler marks the page as PG_hwpoison'ed. * But it could not do more to isolate the page from being accessed again, * nor does it kill the process. This is extremely rare and one of the * potential causes is that the page state has been changed due to * underlying race condition. This is the most severe outcomes. * - * MF_FAILED - The m-f() handler marks the page as PG_hwpoisoned'ed. + * MF_FAILED - The m-f() handler marks the page as PG_hwpoison'ed. * It should have killed the process, but it can't isolate the page, * due to conditions such as extra pin, unmap failure, etc. Accessing * the page again may trigger another MCE and the process will be killed * by the m-f() handler immediately. * - * MF_DELAYED - The m-f() handler marks the page as PG_hwpoisoned'ed. - * The page is unmapped, and is removed from the LRU or file mapping. - * An attempt to access the page again will trigger page fault and the - * PF handler will kill the process. + * MF_DELAYED - The m-f() handler marks the page as PG_hwpoison'ed. + * It means the page was unmapped and partially isolated (e.g. removed from + * file mapping or the LRU) but full cleanup is deferred (e.g. the metadata + * for the memory, as in struct page/folio, is still referenced). Any + * further access to the page will result in the process being killed. * - * MF_RECOVERED - The m-f() handler marks the page as PG_hwpoisoned'ed. + * MF_RECOVERED - The m-f() handler marks the page as PG_hwpoison'ed. * The page has been completely isolated, that is, unmapped, taken out of * the buddy system, or hole-punched out of the file mapping. */ -- 2.53.0.1213.gd9a14994de-goog
