xen/tmem: Remove the boot options and fold them in the tmem.X parameters.

If tmem is built-in or a module, the user has the option on
the command line to influence it by doing: tmem.<some option>
instead of having a variety of "nocleancache", and
"nofrontswap". The others: "noselfballooning" and "selfballooning";
and "noselfshrink" are in a different driver xen-selfballoon.c
and the patches:

 xen/tmem: Remove the usage of 'noselfshrink' and use 'tmem.selfshrink' bool instead.
 xen/tmem: Remove the usage of 'noselfballoon','selfballoon' and use 'tmem.selfballon' bool instead.

remove them.

Also add documentation.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c3bfacb92910dc8d044bec88122c4a85328ed8d5..3de01edca3eab53b90331bef25b072cf85ab95d2 100644 (file)
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3005,6 +3005,26 @@ bytes respectively. Such letter suffixes can also be entirely omitted.
                        Force threading of all interrupt handlers except those
                        marked explicitly IRQF_NO_THREAD.
 
+       tmem            [KNL,XEN]
+                       Enable the Transcendent memory driver if built-in.
+
+       tmem.cleancache=0|1 [KNL, XEN]
+                       Default is on (1). Disable the usage of the cleancache
+                       API to send anonymous pages to the hypervisor.
+
+       tmem.frontswap=0|1 [KNL, XEN]
+                       Default is on (1). Disable the usage of the frontswap
+                       API to send swap pages to the hypervisor.
+
+       tmem.selfballooning=0|1 [KNL, XEN]
+                       Default is on (1). Disable the driving of swap pages
+                       to the hypervisor.
+
+       tmem.selfshrinking=0|1 [KNL, XEN]
+                       Default is on (1). Partial swapoff that immediately
+                       transfers pages from Xen hypervisor back to the
+                       kernel based on different criteria.
+
        topology=       [S390]
                        Format: {off | on}
                        Specify if the kernel should make use of the cpu

diff --git a/drivers/xen/tmem.c b/drivers/xen/tmem.c
index 411c7e3df46cfa169cf01224fe2c68ba1eeaa3cb..c1df0ff8987850f568b2f8d6d69f1d61095314e4 100644 (file)
--- a/drivers/xen/tmem.c
+++ b/drivers/xen/tmem.c
@@ -33,39 +33,19 @@ __setup("tmem", enable_tmem);
 
 #ifdef CONFIG_CLEANCACHE
 static bool cleancache __read_mostly = true;
-static bool selfballooning __read_mostly = true;
-#ifdef CONFIG_XEN_TMEM_MODULE
 module_param(cleancache, bool, S_IRUGO);
+static bool selfballooning __read_mostly = true;
 module_param(selfballooning, bool, S_IRUGO);
-#else
-static int __init no_cleancache(char *s)
-{
-       cleancache = false;
-       return 1;
-}
-__setup("nocleancache", no_cleancache);
-#endif
 #endif /* CONFIG_CLEANCACHE */
 
 #ifdef CONFIG_FRONTSWAP
 static bool frontswap __read_mostly = true;
-#ifdef CONFIG_XEN_TMEM_MODULE
 module_param(frontswap, bool, S_IRUGO);
-#else
-static int __init no_frontswap(char *s)
-{
-       frontswap = false;
-       return 1;
-}
-__setup("nofrontswap", no_frontswap);
-#endif
 #endif /* CONFIG_FRONTSWAP */
 
 #ifdef CONFIG_XEN_SELFBALLOONING
-static bool frontswap_selfshrinking __read_mostly = true;
-#ifdef CONFIG_XEN_TMEM_MODULE
-module_param(frontswap_selfshrinking, bool, S_IRUGO);
-#endif
+static bool selfshrinking __read_mostly = true;
+module_param(selfshrinking, bool, S_IRUGO);
 #endif /* CONFIG_XEN_SELFBALLOONING */
 
 #define TMEM_CONTROL               0
@@ -423,7 +403,7 @@ static int xen_tmem_init(void)
        }
 #endif
 #ifdef CONFIG_XEN_SELFBALLOONING
-       xen_selfballoon_init(selfballooning, frontswap_selfshrinking);
+       xen_selfballoon_init(selfballooning, selfshrinking);
 #endif
        return 0;
 }