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Commit 2ca62b04 authored by Konrad Rzeszutek Wilk's avatar Konrad Rzeszutek Wilk
Browse files

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: default avatarKonrad Rzeszutek Wilk <konrad.wilk@oracle.com>
parent 9fd19653

Documentation/kernel-parameters.txt

+20 −0
Original line number Diff line number Diff line
@@ -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

drivers/xen/tmem.c

+4 −24
Original line number Diff line number Diff line
@@ -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;

}