> + /* > + * In practice groups of pages tend to be accessed/reclaimed/refaulted > + * together. To not go over bvec for those who didn't set BIO_WORKINGSET > + * approximate it by looking at the first page and inducing it to the > + * whole bio > + */ > + if (unlikely(PageWorkingset(iter->bvec->bv_page))) > + bio_set_flag(bio, BIO_WORKINGSET);
IIRC the feedback was that we do not need to deal with BIO_WORKINGSET at all for direct I/O. > + bio_set_flag(bio, BIO_NO_PAGE_REF); > + > + iter->count = 0; > + return 0; > +} This helper should go into bio.c, next to bio_iov_iter_get_pages. And please convert the other callers of bio_iov_iter_get_pages to this scheme as well.
