On Sun, 19 Jul 2015 15:31:16 +0300 Vladimir Davydov <vdavydov@xxxxxxxxxxxxx> wrote: > As noted by Minchan, a benefit of reading idle flag from > /proc/kpageflags is that one can easily filter dirty and/or unevictable > pages while estimating the size of unused memory. > > Note that idle flag read from /proc/kpageflags may be stale in case the > page was accessed via a PTE, because it would be too costly to iterate > over all page mappings on each /proc/kpageflags read to provide an > up-to-date value. To make sure the flag is up-to-date one has to read > /proc/kpageidle first. Is there any value in teaching the regular old page scanner to update these flags? If it's doing an rmap scan anyway... -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
