linux-ext4 - [PATCH RFC PKS/PMEM 28/58] fs/cachefiles: Utilize new kmap

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Date:   Fri,  9 Oct 2020 12:50:03 -0700
From:   ira.weiny@...el.com
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Andy Lutomirski <luto@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>
Cc:     Ira Weiny <ira.weiny@...el.com>,
        David Howells <dhowells@...hat.com>, x86@...nel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Fenghua Yu <fenghua.yu@...el.com>, linux-doc@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-nvdimm@...ts.01.org,
        linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kselftest@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        kvm@...r.kernel.org, netdev@...r.kernel.org, bpf@...r.kernel.org,
        kexec@...ts.infradead.org, linux-bcache@...r.kernel.org,
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        drbd-dev@...ts.linbit.com, linux-block@...r.kernel.org,
        xen-devel@...ts.xenproject.org, linux-cachefs@...hat.com,
        samba-technical@...ts.samba.org, intel-wired-lan@...ts.osuosl.org
Subject: [PATCH RFC PKS/PMEM 28/58] fs/cachefiles: Utilize new kmap_thread()

From: Ira Weiny <ira.weiny@...el.com>

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: David Howells <dhowells@...hat.com>
Signed-off-by: Ira Weiny <ira.weiny@...el.com>
---
 fs/cachefiles/rdwr.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/cachefiles/rdwr.c b/fs/cachefiles/rdwr.c
index 3080cda9e824..2468e5c067ba 100644
--- a/fs/cachefiles/rdwr.c
+++ b/fs/cachefiles/rdwr.c
@@ -936,9 +936,9 @@ int cachefiles_write_page(struct fscache_storage *op, struct page *page)
 		}
 	}
 
-	data = kmap(page);
+	data = kmap_thread(page);
 	ret = kernel_write(file, data, len, &pos);
-	kunmap(page);
+	kunmap_thread(page);
 	fput(file);
 	if (ret != len)
 		goto error_eio;
-- 
2.28.0.rc0.12.gb6a658bd00c9