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xen: add debugfs support

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Add support for exporting statistics on mmu updates, multicall
batching and pv spinlocks into debugfs. The base path is xen/ and
each subsystem adds its own directory: mmu, multicalls, spinlocks.

In each directory, writing 1 to "zero_stats" will cause the
corresponding stats to be zeroed the next time they're updated.

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>
Acked-by: Jan Beulich <jbeulich@novell.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge
2008-08-20 17:02:19 -07:00
committed by Ingo Molnar
parent 168d2f464a
commit 994025caba
7 changed files with 580 additions and 9 deletions
Download Patch File Download Diff File Expand all files Collapse all files

163
arch/x86/xen/mmu.c
View File

@@ -40,6 +40,7 @@
*/
#include <linux/sched.h>
#include <linux/highmem.h>
#include <linux/debugfs.h>
#include <linux/bug.h>
#include <asm/pgtable.h>
@@ -57,6 +58,61 @@
#include "multicalls.h"
#include "mmu.h"
#include "debugfs.h"
#define MMU_UPDATE_HISTO 30
#ifdef CONFIG_XEN_DEBUG_FS
static struct {
u32 pgd_update;
u32 pgd_update_pinned;
u32 pgd_update_batched;
u32 pud_update;
u32 pud_update_pinned;
u32 pud_update_batched;
u32 pmd_update;
u32 pmd_update_pinned;
u32 pmd_update_batched;
u32 pte_update;
u32 pte_update_pinned;
u32 pte_update_batched;
u32 mmu_update;
u32 mmu_update_extended;
u32 mmu_update_histo[MMU_UPDATE_HISTO];
u32 prot_commit;
u32 prot_commit_batched;
u32 set_pte_at;
u32 set_pte_at_batched;
u32 set_pte_at_pinned;
u32 set_pte_at_current;
u32 set_pte_at_kernel;
} mmu_stats;
static u8 zero_stats;
static inline void check_zero(void)
{
if (unlikely(zero_stats)) {
memset(&mmu_stats, 0, sizeof(mmu_stats));
zero_stats = 0;
}
}
#define ADD_STATS(elem, val) \
do { check_zero(); mmu_stats.elem += (val); } while(0)
#else /* !CONFIG_XEN_DEBUG_FS */
#define ADD_STATS(elem, val) do { (void)(val); } while(0)
#endif /* CONFIG_XEN_DEBUG_FS */
/*
* Just beyond the highest usermode address. STACK_TOP_MAX has a
@@ -243,11 +299,21 @@ static void xen_extend_mmu_update(const struct mmu_update *update)
mcs = xen_mc_extend_args(__HYPERVISOR_mmu_update, sizeof(*u));
if (mcs.mc != NULL)
if (mcs.mc != NULL) {
ADD_STATS(mmu_update_extended, 1);
ADD_STATS(mmu_update_histo[mcs.mc->args[1]], -1);
mcs.mc->args[1]++;
else {
if (mcs.mc->args[1] < MMU_UPDATE_HISTO)
ADD_STATS(mmu_update_histo[mcs.mc->args[1]], 1);
else
ADD_STATS(mmu_update_histo[0], 1);
} else {
ADD_STATS(mmu_update, 1);
mcs = __xen_mc_entry(sizeof(*u));
MULTI_mmu_update(mcs.mc, mcs.args, 1, NULL, DOMID_SELF);
ADD_STATS(mmu_update_histo[1], 1);
}
u = mcs.args;
@@ -267,6 +333,8 @@ void xen_set_pmd_hyper(pmd_t *ptr, pmd_t val)
u.val = pmd_val_ma(val);
xen_extend_mmu_update(&u);
ADD_STATS(pmd_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
@@ -274,6 +342,8 @@ void xen_set_pmd_hyper(pmd_t *ptr, pmd_t val)
void xen_set_pmd(pmd_t *ptr, pmd_t val)
{
ADD_STATS(pmd_update, 1);
/* If page is not pinned, we can just update the entry
directly */
if (!xen_page_pinned(ptr)) {
@@ -281,6 +351,8 @@ void xen_set_pmd(pmd_t *ptr, pmd_t val)
return;
}
ADD_STATS(pmd_update_pinned, 1);
xen_set_pmd_hyper(ptr, val);
}
@@ -300,12 +372,18 @@ void xen_set_pte_at(struct mm_struct *mm, unsigned long addr,
if (mm == &init_mm)
preempt_disable();
ADD_STATS(set_pte_at, 1);
// ADD_STATS(set_pte_at_pinned, xen_page_pinned(ptep));
ADD_STATS(set_pte_at_current, mm == current->mm);
ADD_STATS(set_pte_at_kernel, mm == &init_mm);
if (mm == current->mm || mm == &init_mm) {
if (paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU) {
struct multicall_space mcs;
mcs = xen_mc_entry(0);
MULTI_update_va_mapping(mcs.mc, addr, pteval, 0);
ADD_STATS(set_pte_at_batched, 1);
xen_mc_issue(PARAVIRT_LAZY_MMU);
goto out;
} else
@@ -336,6 +414,9 @@ void xen_ptep_modify_prot_commit(struct mm_struct *mm, unsigned long addr,
u.val = pte_val_ma(pte);
xen_extend_mmu_update(&u);
ADD_STATS(prot_commit, 1);
ADD_STATS(prot_commit_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
xen_mc_issue(PARAVIRT_LAZY_MMU);
}
@@ -402,6 +483,8 @@ void xen_set_pud_hyper(pud_t *ptr, pud_t val)
u.val = pud_val_ma(val);
xen_extend_mmu_update(&u);
ADD_STATS(pud_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
xen_mc_issue(PARAVIRT_LAZY_MMU);
preempt_enable();
@@ -409,6 +492,8 @@ void xen_set_pud_hyper(pud_t *ptr, pud_t val)
void xen_set_pud(pud_t *ptr, pud_t val)
{
ADD_STATS(pud_update, 1);
/* If page is not pinned, we can just update the entry
directly */
if (!xen_page_pinned(ptr)) {
@@ -416,11 +501,17 @@ void xen_set_pud(pud_t *ptr, pud_t val)
return;
}
ADD_STATS(pud_update_pinned, 1);
xen_set_pud_hyper(ptr, val);
}
void xen_set_pte(pte_t *ptep, pte_t pte)
{
ADD_STATS(pte_update, 1);
// ADD_STATS(pte_update_pinned, xen_page_pinned(ptep));
ADD_STATS(pte_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
#ifdef CONFIG_X86_PAE
ptep->pte_high = pte.pte_high;
smp_wmb();
@@ -517,6 +608,8 @@ void xen_set_pgd(pgd_t *ptr, pgd_t val)
{
pgd_t *user_ptr = xen_get_user_pgd(ptr);
ADD_STATS(pgd_update, 1);
/* If page is not pinned, we can just update the entry
directly */
if (!xen_page_pinned(ptr)) {
@@ -528,6 +621,9 @@ void xen_set_pgd(pgd_t *ptr, pgd_t val)
return;
}
ADD_STATS(pgd_update_pinned, 1);
ADD_STATS(pgd_update_batched, paravirt_get_lazy_mode() == PARAVIRT_LAZY_MMU);
/* If it's pinned, then we can at least batch the kernel and
user updates together. */
xen_mc_batch();
@@ -1003,3 +1099,66 @@ void xen_exit_mmap(struct mm_struct *mm)
spin_unlock(&mm->page_table_lock);
}
#ifdef CONFIG_XEN_DEBUG_FS
static struct dentry *d_mmu_debug;
static int __init xen_mmu_debugfs(void)
{
struct dentry *d_xen = xen_init_debugfs();
if (d_xen == NULL)
return -ENOMEM;
d_mmu_debug = debugfs_create_dir("mmu", d_xen);
debugfs_create_u8("zero_stats", 0644, d_mmu_debug, &zero_stats);
debugfs_create_u32("pgd_update", 0444, d_mmu_debug, &mmu_stats.pgd_update);
debugfs_create_u32("pgd_update_pinned", 0444, d_mmu_debug,
&mmu_stats.pgd_update_pinned);
debugfs_create_u32("pgd_update_batched", 0444, d_mmu_debug,
&mmu_stats.pgd_update_pinned);
debugfs_create_u32("pud_update", 0444, d_mmu_debug, &mmu_stats.pud_update);
debugfs_create_u32("pud_update_pinned", 0444, d_mmu_debug,
&mmu_stats.pud_update_pinned);
debugfs_create_u32("pud_update_batched", 0444, d_mmu_debug,
&mmu_stats.pud_update_pinned);
debugfs_create_u32("pmd_update", 0444, d_mmu_debug, &mmu_stats.pmd_update);
debugfs_create_u32("pmd_update_pinned", 0444, d_mmu_debug,
&mmu_stats.pmd_update_pinned);
debugfs_create_u32("pmd_update_batched", 0444, d_mmu_debug,
&mmu_stats.pmd_update_pinned);
debugfs_create_u32("pte_update", 0444, d_mmu_debug, &mmu_stats.pte_update);
// debugfs_create_u32("pte_update_pinned", 0444, d_mmu_debug,
// &mmu_stats.pte_update_pinned);
debugfs_create_u32("pte_update_batched", 0444, d_mmu_debug,
&mmu_stats.pte_update_pinned);
debugfs_create_u32("mmu_update", 0444, d_mmu_debug, &mmu_stats.mmu_update);
debugfs_create_u32("mmu_update_extended", 0444, d_mmu_debug,
&mmu_stats.mmu_update_extended);
xen_debugfs_create_u32_array("mmu_update_histo", 0444, d_mmu_debug,
mmu_stats.mmu_update_histo, 20);
debugfs_create_u32("set_pte_at", 0444, d_mmu_debug, &mmu_stats.set_pte_at);
debugfs_create_u32("set_pte_at_batched", 0444, d_mmu_debug,
&mmu_stats.set_pte_at_batched);
debugfs_create_u32("set_pte_at_current", 0444, d_mmu_debug,
&mmu_stats.set_pte_at_current);
debugfs_create_u32("set_pte_at_kernel", 0444, d_mmu_debug,
&mmu_stats.set_pte_at_kernel);
debugfs_create_u32("prot_commit", 0444, d_mmu_debug, &mmu_stats.prot_commit);
debugfs_create_u32("prot_commit_batched", 0444, d_mmu_debug,
&mmu_stats.prot_commit_batched);
return 0;
}
fs_initcall(xen_mmu_debugfs);
#endif /* CONFIG_XEN_DEBUG_FS */