Re: [PATCH RFC PKS/PMEM 24/58] fs/freevxfs: Utilize new kmap_thread()
On Tue, Oct 13, 2020 at 12:25:44PM +0100, Christoph Hellwig wrote: > > - kaddr = kmap(pp); > > + kaddr = kmap_thread(pp); > > memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_SIZE); > > - kunmap(pp); > > + kunmap_thread(pp); > > You only Cced me on this particular patch, which means I have absolutely > no idea what kmap_thread and kunmap_thread actually do, and thus can't > provide an informed review. Sorry the list was so big I struggled with who to CC and on which patches. > > That being said I think your life would be a lot easier if you add > helpers for the above code sequence and its counterpart that copies > to a potential hughmem page first, as that hides the implementation > details from most users. Matthew Wilcox and Al Viro have suggested similar ideas. https://lore.kernel.org/lkml/20201013205012.gi2046...@iweiny-desk2.sc.intel.com/ Ira ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
[PATCH RFC PKS/PMEM 24/58] fs/freevxfs: Utilize new kmap_thread()
From: Ira Weiny The kmap() calls in this FS are localized to a single thread. To avoid the over head of global PKRS updates use the new kmap_thread() call. Cc: Christoph Hellwig Signed-off-by: Ira Weiny --- fs/freevxfs/vxfs_immed.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/freevxfs/vxfs_immed.c b/fs/freevxfs/vxfs_immed.c index bfc780c682fb..9c42fec4cd85 100644 --- a/fs/freevxfs/vxfs_immed.c +++ b/fs/freevxfs/vxfs_immed.c @@ -69,9 +69,9 @@ vxfs_immed_readpage(struct file *fp, struct page *pp) u_int64_t offset = (u_int64_t)pp->index << PAGE_SHIFT; caddr_t kaddr; - kaddr = kmap(pp); + kaddr = kmap_thread(pp); memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_SIZE); - kunmap(pp); + kunmap_thread(pp); flush_dcache_page(pp); SetPageUptodate(pp); -- 2.28.0.rc0.12.gb6a658bd00c9 ___ dri-devel mailing list dri-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/dri-devel
