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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] various hacks for batching mode and stats gathering
ChangeSet 1.1244, 2005/03/10 18:12:10+00:00,
rneugeba@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
various hacks for batching mode and stats gathering
Signed-off-by: michael.fetterman@xxxxxxxxxxxx
linux-2.6.10-xen-sparse/arch/xen/Kconfig | 31 +++
linux-2.6.10-xen-sparse/arch/xen/i386/kernel/Makefile | 2
linux-2.6.10-xen-sparse/arch/xen/i386/kernel/entry.S | 10 -
linux-2.6.10-xen-sparse/arch/xen/i386/kernel/syscall_stats.c | 91
++++++++++
linux-2.6.10-xen-sparse/arch/xen/i386/mm/hypervisor.c | 3
linux-2.6.10-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h | 9
linux-2.6.10-xen-sparse/mm/memory.c | 50 +++++
tools/misc/Makefile | 2
tools/misc/cpuperf/cpuperf.c | 2
tools/misc/xc_shadow.c | 70
+++++++
10 files changed, 264 insertions(+), 6 deletions(-)
diff -Nru a/linux-2.6.10-xen-sparse/arch/xen/Kconfig
b/linux-2.6.10-xen-sparse/arch/xen/Kconfig
--- a/linux-2.6.10-xen-sparse/arch/xen/Kconfig 2005-04-05 12:06:59 -04:00
+++ b/linux-2.6.10-xen-sparse/arch/xen/Kconfig 2005-04-05 12:06:59 -04:00
@@ -115,8 +115,37 @@
space. Odds are that you want to say N here.
config XEN_WRITABLE_PAGETABLES
- bool
+ bool "writable page tables"
default y
+
+config XEN_SYSCALL_STATS
+ bool "system call statistics"
+ default n
+
+config XEN_DEBUG_NO_MMU_BATCHING
+ bool "Disables batching on MMU updates"
+ default n
+ help
+ This does a hypercall per PTE update
+ we only use this for benchmarking
+ enable only if you know what you are doing
+
+config XEN_BATCH_MODE1
+ bool "A variant of writable pagetable using the batch interface"
+ default n
+ help
+ default is no batching and minor mods for some batching
+ we only use this for benchmarking
+ enable only if you know what you are doing
+
+config XEN_BATCH_MODE2
+ bool "forward port of 2.4 batching"
+ default n
+ help
+ default is batching + flushes where 2.4 had them
+ we only use this for benchmarking
+ enable only if you know what you are doing
+
config XEN_SCRUB_PAGES
bool "Scrub memory before freeing it to Xen"
diff -Nru a/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/Makefile
b/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/Makefile
--- a/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/Makefile 2005-04-05
12:06:59 -04:00
+++ b/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/Makefile 2005-04-05
12:06:59 -04:00
@@ -43,6 +43,8 @@
c-obj-$(CONFIG_EFI) += efi.o efi_stub.o
c-obj-$(CONFIG_EARLY_PRINTK) += early_printk.o
+c-obj-$(CONFIG_XEN_SYSCALL_STATS) += syscall_stats.o
+
EXTRA_AFLAGS := -traditional
c-obj-$(CONFIG_SCx200) += scx200.o
diff -Nru a/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/entry.S
b/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/entry.S
--- a/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/entry.S 2005-04-05
12:06:59 -04:00
+++ b/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/entry.S 2005-04-05
12:06:59 -04:00
@@ -280,7 +280,10 @@
jnz syscall_trace_entry
cmpl $(nr_syscalls), %eax
jae syscall_badsys
- call *sys_call_table(,%eax,4)
+#ifdef CONFIG_XEN_SYSCALL_STATS
+ lock incl syscall_stats(,%eax,4)
+#endif
+ call *sys_call_table(,%eax,4)
movl %eax,EAX(%esp)
cli
movl TI_flags(%ebp), %ecx
@@ -305,7 +308,10 @@
cmpl $(nr_syscalls), %eax
jae syscall_badsys
syscall_call:
- call *sys_call_table(,%eax,4)
+#ifdef CONFIG_XEN_SYSCALL_STATS
+ lock incl syscall_stats(,%eax,4)
+#endif
+ call *sys_call_table(,%eax,4)
movl %eax,EAX(%esp) # store the return value
syscall_exit:
XEN_BLOCK_EVENTS(%esi) # make sure we don't miss an interrupt
diff -Nru a/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/syscall_stats.c
b/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/syscall_stats.c
--- /dev/null Wed Dec 31 16:00:00 196900
+++ b/linux-2.6.10-xen-sparse/arch/xen/i386/kernel/syscall_stats.c
2005-04-05 12:06:59 -04:00
@@ -0,0 +1,91 @@
+/* -*- Mode:C; c-basic-offset:4; tab-width:4 -*-
+ ****************************************************************************
+ * (C) 2005 - Rolf Neugebauer - Intel Research Cambridge
+ ****************************************************************************
+ *
+ * File: syscall_stats.c
+ * Author: Rolf Neugebauer (rolf.neugebauer@xxxxxxxxx)
+ * Date: Mar 2005
+ *
+ * Description: add a proc interface to get per system call stats
+ */
+
+
+#include <linux/config.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
+#include <asm/unistd.h>
+
+unsigned long syscall_stats[NR_syscalls];
+static unsigned char foobar[4];
+
+/* a write just resests the counter */
+static ssize_t syscall_write(struct file *f, const char *data,
+ size_t size, loff_t *pos)
+{
+ printk("resetting syscall stats\n");
+ memset(&syscall_stats, 0, sizeof(syscall_stats));
+ return size;
+}
+
+static int show_syscall(struct seq_file *m, void *v)
+{
+ int i;
+ for ( i=0; i<NR_syscalls; i++ )
+ {
+ seq_printf(m, "%lu ", syscall_stats[i]);
+ }
+ seq_printf(m, "\n");
+ return 0;
+}
+
+static void *c_start(struct seq_file *m, loff_t *pos)
+{
+ return *pos == 0 ? foobar : NULL;
+}
+
+static void *c_next(struct seq_file *m, void *v, loff_t *pos)
+{
+ ++*pos;
+ return c_start(m, pos);
+}
+
+static void c_stop(struct seq_file *m, void *v)
+{
+}
+
+static struct seq_operations syscall_op = {
+ start: c_start,
+ next: c_next,
+ stop: c_stop,
+ show: show_syscall,
+};
+
+static int syscall_open(struct inode *inode, struct file *file)
+{
+ return seq_open(file, &syscall_op);
+}
+
+static struct file_operations proc_syscall_operations = {
+ open: syscall_open,
+ read: seq_read,
+ write: syscall_write,
+ llseek: seq_lseek,
+ release: seq_release,
+};
+
+
+static struct proc_dir_entry *entry;
+
+static int __init syscall_stats_init(void)
+{
+ printk("Initialising syscall stats.\n");
+
+ entry = create_proc_entry("syscalls", 0777, NULL);
+ if (entry)
+ entry->proc_fops = &proc_syscall_operations;
+ else
+ printk("Unable to create /proc/syscalls.\n");
+ return 0;
+}
+subsys_initcall(syscall_stats_init);
diff -Nru a/linux-2.6.10-xen-sparse/arch/xen/i386/mm/hypervisor.c
b/linux-2.6.10-xen-sparse/arch/xen/i386/mm/hypervisor.c
--- a/linux-2.6.10-xen-sparse/arch/xen/i386/mm/hypervisor.c 2005-04-05
12:06:59 -04:00
+++ b/linux-2.6.10-xen-sparse/arch/xen/i386/mm/hypervisor.c 2005-04-05
12:06:59 -04:00
@@ -133,6 +133,9 @@
per_cpu(update_queue[idx], cpu).ptr = virt_to_machine(ptr);
per_cpu(update_queue[idx], cpu).val = val;
increment_index();
+#ifdef CONFIG_XEN_DEBUG_NO_MMU_BATCHING
+ __flush_page_update_queue();
+#endif
spin_unlock_irqrestore(&update_lock, flags);
}
diff -Nru a/linux-2.6.10-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h
b/linux-2.6.10-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h
--- a/linux-2.6.10-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h
2005-04-05 12:06:59 -04:00
+++ b/linux-2.6.10-xen-sparse/include/asm-xen/asm-i386/pgtable-2level.h
2005-04-05 12:06:59 -04:00
@@ -36,7 +36,16 @@
#endif
#define set_pte_atomic(pteptr, pteval) set_pte(pteptr, pteval)
#else
+#if defined(CONFIG_XEN_DEBUG_NO_MMU_BATCHING)
+#define set_pte(pteptr, pteval)\
+ set_pte_batched(pteptr, pteval)
+#elif defined(CONFIG_XEN_BATCH_MODE)
+#define set_pte(pteptr, pteval)({\
+ set_pte_batched(pteptr, pteval);\
+ _flush_page_update_queue();})
+#else
#define set_pte(pteptr, pteval) (*(pteptr) = pteval)
+#endif
#define set_pte_atomic(pteptr, pteval) set_pte(pteptr,pteval)
#endif
/*
diff -Nru a/linux-2.6.10-xen-sparse/mm/memory.c
b/linux-2.6.10-xen-sparse/mm/memory.c
--- a/linux-2.6.10-xen-sparse/mm/memory.c 2005-04-05 12:06:59 -04:00
+++ b/linux-2.6.10-xen-sparse/mm/memory.c 2005-04-05 12:06:59 -04:00
@@ -218,6 +218,11 @@
* dst->page_table_lock is held on entry and exit,
* but may be dropped within pmd_alloc() and pte_alloc_map().
*/
+#ifdef CONFIG_XEN_BATCH_MODE1
+#undef set_pte
+#define set_pte(pteptr, pteval)\
+ set_pte_batched(pteptr, pteval);
+#endif
int copy_page_range(struct mm_struct *dst, struct mm_struct *src,
struct vm_area_struct *vma)
{
@@ -354,8 +359,11 @@
cond_resched_lock(&dst->page_table_lock);
cont_copy_pmd_range:
src_pmd++;
- dst_pmd++;
+ dst_pmd++;
} while ((unsigned long)src_pmd & PMD_TABLE_MASK);
+#ifdef CONFIG_XEN_BATCH_MODE1
+ _flush_page_update_queue();
+#endif
}
out_unlock:
spin_unlock(&src->page_table_lock);
@@ -445,9 +453,19 @@
free_swap_and_cache(pte_to_swp_entry(pte));
pte_clear(ptep);
}
+#ifdef CONFIG_XEN_BATCH_MODE1
+ _flush_page_update_queue();
+#endif
pte_unmap(ptep-1);
}
+#ifdef CONFIG_XEN_BATCH_MODE1
+#undef set_pte
+#define set_pte(pteptr, pteval)\
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