Messages in this thread | | | Date | Thu, 05 Sep 2002 17:41:23 -0400 | From | Chuck Lever <> | Subject | Re: invalidate_inode_pages in 2.5.32/3 |
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Andrew Morton wrote:
> Trond Myklebust wrote: > >>>>>>>" " == Andrew Morton <akpm@zip.com.au> writes: >>>>>>> >> > You may have more success using the stronger >> > invalidate_inode_pages2(). >> >>Shouldn't make any difference. Chuck is seeing this on readdir() pages >>which, of course, don't suffer from problems of dirtiness etc on NFS. >> > > Well the VM will take a ref on the page during reclaim even if it > is clean. > > With what sort of frequency does this happen? If it's easily reproducible > then dunno. If it's once-an-hour then it may be page reclaim, conceivably. > The PageLRU debug test in there will tell us.
this happens every time i run test6 on 2.5.32 or 2.5.33. the pages are not on the LRU, and are not locked, when the NFS client calls invalidate_inode_pages.
how do these pages get into the page cache? answer:
nfs_readdir_filler is invoked by read_cache_page to fill a page. when nfs_readdir_filler is invoked in 2.5.31, the page count on the page to be filled is always 2. when nfs_readdir_filler is invoked in 2.5.32+, the page count is very often 3, but occasionally it is 2.
- Chuck Lever
-- corporate: <cel at netapp dot com> personal: <chucklever at bigfoot dot com>
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