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Subject[PATCH 6/9] xen/tmem: Remove the boot options and fold them in the tmem.X parameters.
Date
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.

removes them.

Also add documentation.

Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
---
Documentation/kernel-parameters.txt | 20 ++++++++++++++++++++
drivers/xen/tmem.c | 28 ++++------------------------
2 files changed, 24 insertions(+), 24 deletions(-)

diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c3bfacb..3de01ed 100644
--- 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 411c7e3..c1df0ff 100644
--- 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;
}
--
1.7.7.6


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