On Tue, Jun 20, 2017 at 07:35:35PM -0400, Trond Myklebust wrote: > The following patches are intended to smooth out the page writeback > performance by ensuring that we commit the data earlier on the server. Was there some particular benchmark or hardware setup that motivated doing this now? --b. > > We assume that if something is starting writeback on the pages, then > that process wants to commit the data as soon as possible, whether it > is an application or just the background flush process. > We also assume that for streaming type processes, we don't want to pause > the I/O in order to commit, so we don't want to rely on a counter of > in-flight I/O to the entire inode going to zero. > > We therefore set up a monitor that counts the number of in-flight > writes for each call to nfs_writepages(). Once all the writes to that > call to nfs_writepages has completed, we send the commit. Note that this > mirrors the behaviour for O_DIRECT writes, where we similarly track the > in-flight writes on a per-call basis. > > Trond Myklebust (3): > NFS: Remove unused fields in the page I/O structures > NFS: Ensure we commit after writeback is complete > NFS: Fix commit policy for non-blocking calls to nfs_write_inode() > > fs/nfs/pagelist.c | 5 ++-- > fs/nfs/write.c | 59 +++++++++++++++++++++++++++++++++++++++++++++++- > include/linux/nfs_page.h | 2 +- > include/linux/nfs_xdr.h | 3 ++- > 4 files changed, 64 insertions(+), 5 deletions(-) > > -- > 2.9.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-nfs" in > the body of a message to majordomo@xxxxxxxxxxxxxxx > More majordomo info at http://vger.kernel.org/majordomo-info.html -- To unsubscribe from this list: send the line "unsubscribe linux-nfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
