nfsd41: hard page limit for DRC
Use no more than 1/128th of the number of free pages at nfsd startup for the
v4.1 DRC.
This is an arbitrary default which should probably end up under the control
of an administrator.
Signed-off-by: Andy Adamson <andros@netapp.com>
[moved added fields in struct svc_serv under CONFIG_NFSD_V4_1]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
[fix set_max_drc calculation of sv_drc_max_pages]
[moved NFSD_DRC_SIZE_SHIFT's declaration up in header file]
Signed-off-by: Benny Halevy <bhalevy@panasas.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
diff --git a/include/linux/nfsd/nfsd.h b/include/linux/nfsd/nfsd.h
index ab9616d..1f063d4 100644
--- a/include/linux/nfsd/nfsd.h
+++ b/include/linux/nfsd/nfsd.h
@@ -331,6 +331,9 @@
#define NFSD_LEASE_TIME (nfs4_lease_time())
#define NFSD_LAUNDROMAT_MINTIMEOUT 10 /* seconds */
+/* The percent of nr_free_buffer_pages used by the V4.1 server DRC */
+#define NFSD_DRC_SIZE_SHIFT 7
+
/*
* The following attributes are currently not supported by the NFSv4 server:
* ARCHIVE (deprecated anyway)
diff --git a/include/linux/sunrpc/svc.h b/include/linux/sunrpc/svc.h
index 815dd58..d209c63 100644
--- a/include/linux/sunrpc/svc.h
+++ b/include/linux/sunrpc/svc.h
@@ -95,6 +95,8 @@
struct module * sv_module; /* optional module to count when
* adding threads */
svc_thread_fn sv_function; /* main function for threads */
+ unsigned int sv_drc_max_pages; /* Total pages for DRC */
+ unsigned int sv_drc_pages_used;/* DRC pages used */
};
/*