Re: zero-filed page on VOP_PUTPAGES

[Emmanuel Dreyfus <manu%netbsd.org@localhost>]

On Wed, Aug 17, 2011 at 03:24:25PM +0000, Emmanuel Dreyfus wrote:
> I backported this change, and the problem occurs much less often, 
> and now always at offset 0. Do we have two different bugs?
> http://mail-index.netbsd.org/source-changes/2009/11/05/msg002710.html

Here is a trace below (netbsd-5, not using PUFFS_KFLAG_WTCACHE, with yamt's 
patch and the fix above backported. zeroed chunk appeared 953 bytes @ 8192)

        reqid: 0, opclass 2 (FAF), optype: PUFFS_VN_WRITE, cookie: 0xbb90f340,
                aux: 0xbb91f02c, auxlen: 9289, pid: 0, lwpid: 27
                offset: 0, resid 9145, ioflag 0x0
                since previous call: 0.128994
        reqid: 2703, opclass 2, optype: PUFFS_VN_SETATTR, cookie: 0xbb90f340,
                aux: 0xbb91e02c, auxlen: 240, pid: 0, lwpid: 27
                size: 9145/0x23b9
                since previous call: 0.000512
        reqid: 2704, opclass 2, optype: PUFFS_VN_GETATTR, cookie: 0xbb90f340,
                aux: 0xbb91f02c, auxlen: 240, pid: 19324, lwpid: 1
                since previous call: 0.005915
        RV reqid: 2704, result: 0 
        RV reqid: 2703, result: 0 
        reqid: 2705, opclass 2, optype: PUFFS_VN_FSYNC, cookie: 0xbb90f340,
                aux: 0xbb92002c, auxlen: 148, pid: 0, lwpid: 27
                since previous call: 0.083257
        RV reqid: 2705, result: 0 
        reqid: 2706, opclass 1, optype: PUFFS_VFS_SYNC, cookie: 0x0,
                aux: 0xbb91e02c, auxlen: 132, pid: 0, lwpid: 27
                since previous call: 0.009297
        RV reqid: 2706, result: 0 


That seems to be triggered by fsync.


-- 
Emmanuel Dreyfus
manu%netbsd.org@localhost