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authorLinus Torvalds <torvalds@linux-foundation.org>2013-05-20 14:25:19 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-05-20 14:25:19 -0700
commit669c743362daa6b9167cef4df8b405ba9c5c3a53 (patch)
treedb2abdeed1d5a7b80ddfc557e9210bc0a9157330
parent622f223488517f2b0a5a5e518b2a6c950cf0a2ee (diff)
parentfce92683570c2ddcdb82cde67b0b07800106fbd9 (diff)
downloadlinux-669c743362daa6b9167cef4df8b405ba9c5c3a53.tar.gz
Merge tag 'stable/for-linus-3.10-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
Pull Xen fixes from Konrad Rzeszutek Wilk: - Regression fix in xen privcmd fixing a memory leak. - Add Documentation for tmem driver. - Simplify and remove code in the tmem driver. - Cleanups. * tag 'stable/for-linus-3.10-rc1-tag' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen: xen: Fixed assignment error in if statement xen/xenbus: Fixed over 80 character limit issue xen/xenbus: Fixed indentation error in switch case xen/tmem: Don't use self[ballooning|shrinking] if frontswap is off. xen/tmem: Remove the usage of '[no|]selfballoon' and use 'tmem.selfballooning' bool instead. xen/tmem: Remove the usage of 'noselfshrink' and use 'tmem.selfshrink' bool instead. xen/tmem: Remove the boot options and fold them in the tmem.X parameters. xen/tmem: s/disable_// and change the logic. xen/tmem: Fix compile warning. xen/tmem: Split out the different module/boot options. xen/tmem: Move all of the boot and module parameters to the top of the file. xen/tmem: Cleanup. Remove the parts that say temporary. xen/privcmd: fix condition in privcmd_close()
-rw-r--r--Documentation/kernel-parameters.txt21
-rw-r--r--drivers/xen/Kconfig7
-rw-r--r--drivers/xen/balloon.c3
-rw-r--r--drivers/xen/privcmd.c2
-rw-r--r--drivers/xen/tmem.c87
-rw-r--r--drivers/xen/xen-selfballoon.c47
-rw-r--r--drivers/xen/xenbus/xenbus_dev_backend.c21
7 files changed, 82 insertions, 106 deletions
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index c3bfacb9291..6e3b18a8afc 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -3005,6 +3005,27 @@ 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. If disabled
+ the selfballooning and selfshrinking are force disabled.
+
+ 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/Kconfig b/drivers/xen/Kconfig
index f03bf501527..9e02d60a364 100644
--- a/drivers/xen/Kconfig
+++ b/drivers/xen/Kconfig
@@ -19,11 +19,10 @@ config XEN_SELFBALLOONING
by the current usage of anonymous memory ("committed AS") and
controlled by various sysfs-settable parameters. Configuring
FRONTSWAP is highly recommended; if it is not configured, self-
- ballooning is disabled by default but can be enabled with the
- 'selfballooning' kernel boot parameter. If FRONTSWAP is configured,
+ ballooning is disabled by default. If FRONTSWAP is configured,
frontswap-selfshrinking is enabled by default but can be disabled
- with the 'noselfshrink' kernel boot parameter; and self-ballooning
- is enabled by default but can be disabled with the 'noselfballooning'
+ with the 'tmem.selfshrink=0' kernel boot parameter; and self-ballooning
+ is enabled by default but can be disabled with the 'tmem.selfballooning=0'
kernel boot parameter. Note that systems without a sufficiently
large swap device should not enable self-ballooning.
diff --git a/drivers/xen/balloon.c b/drivers/xen/balloon.c
index a56776dbe09..930fb681790 100644
--- a/drivers/xen/balloon.c
+++ b/drivers/xen/balloon.c
@@ -407,7 +407,8 @@ static enum bp_state decrease_reservation(unsigned long nr_pages, gfp_t gfp)
nr_pages = ARRAY_SIZE(frame_list);
for (i = 0; i < nr_pages; i++) {
- if ((page = alloc_page(gfp)) == NULL) {
+ page = alloc_page(gfp);
+ if (page == NULL) {
nr_pages = i;
state = BP_EAGAIN;
break;
diff --git a/drivers/xen/privcmd.c b/drivers/xen/privcmd.c
index ca2b00e9d55..2cfc24d76fc 100644
--- a/drivers/xen/privcmd.c
+++ b/drivers/xen/privcmd.c
@@ -504,7 +504,7 @@ static void privcmd_close(struct vm_area_struct *vma)
struct page **pages = vma->vm_private_data;
int numpgs = (vma->vm_end - vma->vm_start) >> PAGE_SHIFT;
- if (!xen_feature(XENFEAT_auto_translated_physmap || !numpgs || !pages))
+ if (!xen_feature(XENFEAT_auto_translated_physmap) || !numpgs || !pages)
return;
xen_unmap_domain_mfn_range(vma, numpgs, pages);
diff --git a/drivers/xen/tmem.c b/drivers/xen/tmem.c
index e3600be4e7f..18e8bd8fa94 100644
--- a/drivers/xen/tmem.c
+++ b/drivers/xen/tmem.c
@@ -11,11 +11,7 @@
#include <linux/init.h>
#include <linux/pagemap.h>
#include <linux/cleancache.h>
-
-/* temporary ifdef until include/linux/frontswap.h is upstream */
-#ifdef CONFIG_FRONTSWAP
#include <linux/frontswap.h>
-#endif
#include <xen/xen.h>
#include <xen/interface/xen.h>
@@ -24,6 +20,34 @@
#include <asm/xen/hypervisor.h>
#include <xen/tmem.h>
+#ifndef CONFIG_XEN_TMEM_MODULE
+bool __read_mostly tmem_enabled = false;
+
+static int __init enable_tmem(char *s)
+{
+ tmem_enabled = true;
+ return 1;
+}
+__setup("tmem", enable_tmem);
+#endif
+
+#ifdef CONFIG_CLEANCACHE
+static bool cleancache __read_mostly = true;
+module_param(cleancache, bool, S_IRUGO);
+static bool selfballooning __read_mostly = true;
+module_param(selfballooning, bool, S_IRUGO);
+#endif /* CONFIG_CLEANCACHE */
+
+#ifdef CONFIG_FRONTSWAP
+static bool frontswap __read_mostly = true;
+module_param(frontswap, bool, S_IRUGO);
+#endif /* CONFIG_FRONTSWAP */
+
+#ifdef CONFIG_XEN_SELFBALLOONING
+static bool selfshrinking __read_mostly = true;
+module_param(selfshrinking, bool, S_IRUGO);
+#endif /* CONFIG_XEN_SELFBALLOONING */
+
#define TMEM_CONTROL 0
#define TMEM_NEW_POOL 1
#define TMEM_DESTROY_POOL 2
@@ -129,16 +153,6 @@ static int xen_tmem_flush_object(u32 pool_id, struct tmem_oid oid)
return xen_tmem_op(TMEM_FLUSH_OBJECT, pool_id, oid, 0, 0, 0, 0, 0);
}
-#ifndef CONFIG_XEN_TMEM_MODULE
-bool __read_mostly tmem_enabled = false;
-
-static int __init enable_tmem(char *s)
-{
- tmem_enabled = true;
- return 1;
-}
-__setup("tmem", enable_tmem);
-#endif
#ifdef CONFIG_CLEANCACHE
static int xen_tmem_destroy_pool(u32 pool_id)
@@ -230,20 +244,6 @@ static int tmem_cleancache_init_shared_fs(char *uuid, size_t pagesize)
return xen_tmem_new_pool(shared_uuid, TMEM_POOL_SHARED, pagesize);
}
-static bool disable_cleancache __read_mostly;
-static bool disable_selfballooning __read_mostly;
-#ifdef CONFIG_XEN_TMEM_MODULE
-module_param(disable_cleancache, bool, S_IRUGO);
-module_param(disable_selfballooning, bool, S_IRUGO);
-#else
-static int __init no_cleancache(char *s)
-{
- disable_cleancache = true;
- return 1;
-}
-__setup("nocleancache", no_cleancache);
-#endif
-
static struct cleancache_ops tmem_cleancache_ops = {
.put_page = tmem_cleancache_put_page,
.get_page = tmem_cleancache_get_page,
@@ -361,20 +361,6 @@ static void tmem_frontswap_init(unsigned ignored)
xen_tmem_new_pool(private, TMEM_POOL_PERSIST, PAGE_SIZE);
}
-static bool disable_frontswap __read_mostly;
-static bool disable_frontswap_selfshrinking __read_mostly;
-#ifdef CONFIG_XEN_TMEM_MODULE
-module_param(disable_frontswap, bool, S_IRUGO);
-module_param(disable_frontswap_selfshrinking, bool, S_IRUGO);
-#else
-static int __init no_frontswap(char *s)
-{
- disable_frontswap = true;
- return 1;
-}
-__setup("nofrontswap", no_frontswap);
-#endif
-
static struct frontswap_ops tmem_frontswap_ops = {
.store = tmem_frontswap_store,
.load = tmem_frontswap_load,
@@ -382,8 +368,6 @@ static struct frontswap_ops tmem_frontswap_ops = {
.invalidate_area = tmem_frontswap_flush_area,
.init = tmem_frontswap_init
};
-#else /* CONFIG_FRONTSWAP */
-#define disable_frontswap_selfshrinking 1
#endif
static int xen_tmem_init(void)
@@ -391,7 +375,7 @@ static int xen_tmem_init(void)
if (!xen_domain())
return 0;
#ifdef CONFIG_FRONTSWAP
- if (tmem_enabled && !disable_frontswap) {
+ if (tmem_enabled && frontswap) {
char *s = "";
struct frontswap_ops *old_ops =
frontswap_register_ops(&tmem_frontswap_ops);
@@ -408,7 +392,7 @@ static int xen_tmem_init(void)
#endif
#ifdef CONFIG_CLEANCACHE
BUG_ON(sizeof(struct cleancache_filekey) != sizeof(struct tmem_oid));
- if (tmem_enabled && !disable_cleancache) {
+ if (tmem_enabled && cleancache) {
char *s = "";
struct cleancache_ops *old_ops =
cleancache_register_ops(&tmem_cleancache_ops);
@@ -419,8 +403,15 @@ static int xen_tmem_init(void)
}
#endif
#ifdef CONFIG_XEN_SELFBALLOONING
- xen_selfballoon_init(!disable_selfballooning,
- !disable_frontswap_selfshrinking);
+ /*
+ * There is no point of driving pages to the swap system if they
+ * aren't going anywhere in tmem universe.
+ */
+ if (!frontswap) {
+ selfshrinking = false;
+ selfballooning = false;
+ }
+ xen_selfballoon_init(selfballooning, selfshrinking);
#endif
return 0;
}
diff --git a/drivers/xen/xen-selfballoon.c b/drivers/xen/xen-selfballoon.c
index f2ef569c7cc..f70984a892a 100644
--- a/drivers/xen/xen-selfballoon.c
+++ b/drivers/xen/xen-selfballoon.c
@@ -53,15 +53,12 @@
* System configuration note: Selfballooning should not be enabled on
* systems without a sufficiently large swap device configured; for best
* results, it is recommended that total swap be increased by the size
- * of the guest memory. Also, while technically not required to be
- * configured, it is highly recommended that frontswap also be configured
- * and enabled when selfballooning is running. So, selfballooning
- * is disabled by default if frontswap is not configured and can only
- * be enabled with the "selfballooning" kernel boot option; similarly
- * selfballooning is enabled by default if frontswap is configured and
- * can be disabled with the "noselfballooning" kernel boot option. Finally,
- * when frontswap is configured, frontswap-selfshrinking can be disabled
- * with the "noselfshrink" kernel boot option.
+ * of the guest memory. Note, that selfballooning should be disabled by default
+ * if frontswap is not configured. Similarly selfballooning should be enabled
+ * by default if frontswap is configured and can be disabled with the
+ * "tmem.selfballooning=0" kernel boot option. Finally, when frontswap is
+ * configured, frontswap-selfshrinking can be disabled with the
+ * "tmem.selfshrink=0" kernel boot option.
*
* Selfballooning is disallowed in domain0 and force-disabled.
*
@@ -120,9 +117,6 @@ static DECLARE_DELAYED_WORK(selfballoon_worker, selfballoon_process);
/* Enable/disable with sysfs. */
static bool frontswap_selfshrinking __read_mostly;
-/* Enable/disable with kernel boot option. */
-static bool use_frontswap_selfshrink = true;
-
/*
* The default values for the following parameters were deemed reasonable
* by experimentation, may be workload-dependent, and can all be
@@ -176,35 +170,6 @@ static void frontswap_selfshrink(void)
frontswap_shrink(tgt_frontswap_pages);
}
-static int __init xen_nofrontswap_selfshrink_setup(char *s)
-{
- use_frontswap_selfshrink = false;
- return 1;
-}
-
-__setup("noselfshrink", xen_nofrontswap_selfshrink_setup);
-
-/* Disable with kernel boot option. */
-static bool use_selfballooning = true;
-
-static int __init xen_noselfballooning_setup(char *s)
-{
- use_selfballooning = false;
- return 1;
-}
-
-__setup("noselfballooning", xen_noselfballooning_setup);
-#else /* !CONFIG_FRONTSWAP */
-/* Enable with kernel boot option. */
-static bool use_selfballooning;
-
-static int __init xen_selfballooning_setup(char *s)
-{
- use_selfballooning = true;
- return 1;
-}
-
-__setup("selfballooning", xen_selfballooning_setup);
#endif /* CONFIG_FRONTSWAP */
#define MB2PAGES(mb) ((mb) << (20 - PAGE_SHIFT))
diff --git a/drivers/xen/xenbus/xenbus_dev_backend.c b/drivers/xen/xenbus/xenbus_dev_backend.c
index d7300080076..a6f42fc0140 100644
--- a/drivers/xen/xenbus/xenbus_dev_backend.c
+++ b/drivers/xen/xenbus/xenbus_dev_backend.c
@@ -70,22 +70,21 @@ static long xenbus_alloc(domid_t domid)
return err;
}
-static long xenbus_backend_ioctl(struct file *file, unsigned int cmd, unsigned long data)
+static long xenbus_backend_ioctl(struct file *file, unsigned int cmd,
+ unsigned long data)
{
if (!capable(CAP_SYS_ADMIN))
return -EPERM;
switch (cmd) {
- case IOCTL_XENBUS_BACKEND_EVTCHN:
- if (xen_store_evtchn > 0)
- return xen_store_evtchn;
- return -ENODEV;
-
- case IOCTL_XENBUS_BACKEND_SETUP:
- return xenbus_alloc(data);
-
- default:
- return -ENOTTY;
+ case IOCTL_XENBUS_BACKEND_EVTCHN:
+ if (xen_store_evtchn > 0)
+ return xen_store_evtchn;
+ return -ENODEV;
+ case IOCTL_XENBUS_BACKEND_SETUP:
+ return xenbus_alloc(data);
+ default:
+ return -ENOTTY;
}
}