Hi Ryan, On 2015/8/4 14:16, Ryan Ding wrote: > Hi Joseph, > > Sorry for bothering you with the old patches. But I really need to know what > this patch is for. > > https://oss.oracle.com/pipermail/ocfs2-devel/2015-January/010496.html > > From above email archive, you mentioned those patches aim to reduce the host > page cache consumption. But in my opinion, after append direct io, the page > used for buffer is clean. System can realloc those cached pages. We can even > call invalidate_mapping_pages to fast that process. Maybe more pages will be > needed during direct io. But direct io size can not be too large, right? > We introduced the append direct io because originally ocfs2 would fall back to buffer io in case of thin provision, which was not the actual behavior that user expect. I didn't get you that more pages would be needed during direct io. Could you please explain it more clearly?
Thanks, Joseph > Thanks, > Ryan > > _______________________________________________ Ocfs2-devel mailing list Ocfs2-devel@oss.oracle.com https://oss.oracle.com/mailman/listinfo/ocfs2-devel
