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Tue, 13 Oct 2020 14:36:58 -0400 (EDT) (envelope-from nico@fluxnic.net) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed; d=fluxnic.net; h=date:from:to:cc:subject:in-reply-to:message-id:references:mime-version:content-type; s=2016-12.pbsmtp; bh=/xoWviDLFg5PKRQ9rObRWDXVC++pmZtYhfbDb0DFq7E=; b=v5OoWtflZD131TYsBl2A9g0L/PCRe2nu6sy2IJY2ys8stI3sGPGydjk9hbVpZeTUKIjemrnRhLwKFlAM+dXEIGXz5t0LfwSiRA8m7hrB4WLH79+9F2ww8ICEhYu0fLjFgoDc1lKWqG4ZKNRDYjtbn/p6CJBipu1Te7ZvLuk/HMw= Received: from yoda.home (unknown [24.203.50.76]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by pb-smtp1.pobox.com (Postfix) with ESMTPSA id CD98F955F4; Tue, 13 Oct 2020 14:36:57 -0400 (EDT) (envelope-from nico@fluxnic.net) Received: from xanadu.home (xanadu.home [192.168.2.2]) by yoda.home (Postfix) with ESMTPSA id CF7492DA0BC7; Tue, 13 Oct 2020 14:36:56 -0400 (EDT) Date: Tue, 13 Oct 2020 14:36:56 -0400 (EDT) From: Nicolas Pitre To: Ira Weiny cc: Andrew Morton , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Andy Lutomirski , Peter Zijlstra , x86@kernel.org, Dave Hansen , Dan Williams , Fenghua Yu , linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-nvdimm@lists.01.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, kvm@vger.kernel.org, netdev@vger.kernel.org, bpf@vger.kernel.org, kexec@lists.infradead.org, linux-bcache@vger.kernel.org, linux-mtd@lists.infradead.org, devel@driverdev.osuosl.org, linux-efi@vger.kernel.org, linux-mmc@vger.kernel.org, linux-scsi@vger.kernel.org, target-devel@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-erofs@lists.ozlabs.org, linux-um@lists.infradead.org, linux-ntfs-dev@lists.sourceforge.net, reiserfs-devel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-nilfs@vger.kernel.org, cluster-devel@redhat.com, ecryptfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-afs@lists.infradead.org, linux-rdma@vger.kernel.org, amd-gfx@lists.freedesktop.org, dri-devel@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, drbd-dev@lists.linbit.com, linux-block@vger.kernel.org, xen-devel@lists.xenproject.org, linux-cachefs@redhat.com, samba-technical@lists.samba.org, intel-wired-lan@lists.osuosl.org Subject: Re: [PATCH RFC PKS/PMEM 33/58] fs/cramfs: Utilize new kmap_thread() In-Reply-To: <20201009195033.3208459-34-ira.weiny@intel.com> Message-ID: References: <20201009195033.3208459-1-ira.weiny@intel.com> <20201009195033.3208459-34-ira.weiny@intel.com> MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII X-Pobox-Relay-ID: 13301A02-0D83-11EB-84D0-D152C8D8090B-78420484!pb-smtp1.pobox.com Precedence: bulk List-ID: X-Mailing-List: io-uring@vger.kernel.org On Fri, 9 Oct 2020, ira.weiny@intel.com wrote: > 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: Nicolas Pitre > Signed-off-by: Ira Weiny Acked-by: Nicolas Pitre > fs/cramfs/inode.c | 10 +++++----- > 1 file changed, 5 insertions(+), 5 deletions(-) > > diff --git a/fs/cramfs/inode.c b/fs/cramfs/inode.c > index 912308600d39..003c014a42ed 100644 > --- a/fs/cramfs/inode.c > +++ b/fs/cramfs/inode.c > @@ -247,8 +247,8 @@ static void *cramfs_blkdev_read(struct super_block *sb, unsigned int offset, > struct page *page = pages[i]; > > if (page) { > - memcpy(data, kmap(page), PAGE_SIZE); > - kunmap(page); > + memcpy(data, kmap_thread(page), PAGE_SIZE); > + kunmap_thread(page); > put_page(page); > } else > memset(data, 0, PAGE_SIZE); > @@ -826,7 +826,7 @@ static int cramfs_readpage(struct file *file, struct page *page) > > maxblock = (inode->i_size + PAGE_SIZE - 1) >> PAGE_SHIFT; > bytes_filled = 0; > - pgdata = kmap(page); > + pgdata = kmap_thread(page); > > if (page->index < maxblock) { > struct super_block *sb = inode->i_sb; > @@ -914,13 +914,13 @@ static int cramfs_readpage(struct file *file, struct page *page) > > memset(pgdata + bytes_filled, 0, PAGE_SIZE - bytes_filled); > flush_dcache_page(page); > - kunmap(page); > + kunmap_thread(page); > SetPageUptodate(page); > unlock_page(page); > return 0; > > err: > - kunmap(page); > + kunmap_thread(page); > ClearPageUptodate(page); > SetPageError(page); > unlock_page(page); > -- > 2.28.0.rc0.12.gb6a658bd00c9 > >