# HG changeset patch
# User Keir Fraser <keir.fraser@xxxxxxxxxx>
# Date 1212658579 -3600
# Node ID 24c86abbb387c795118648821416848e66481ff8
# Parent 02132fc864b436336aca20cb4aee60112d0fd5a9
x86 hvm: Improve paging performance for 64b solaris guests
The following patch provides a 'fast-path' for sh_remove_write_access()
for 64 bit Solaris HVM guests. This provides a significant performance
boost for such guests; our testing shows a 200-400% improvement in
microbenchmarks such as fork(), exit(), etc...
From: Gary Pennington <Gary.Pennington@xxxxxxx>
Signed-off-by: Keir Fraser <keir.fraser@xxxxxxxxxx>
---
xen/arch/x86/mm/shadow/common.c | 5 +++++
xen/arch/x86/mm/shadow/multi.c | 2 ++
xen/include/asm-x86/perfc_defn.h | 3 +--
3 files changed, 8 insertions(+), 2 deletions(-)
diff -r 02132fc864b4 -r 24c86abbb387 xen/arch/x86/mm/shadow/common.c
--- a/xen/arch/x86/mm/shadow/common.c Thu Jun 05 10:34:01 2008 +0100
+++ b/xen/arch/x86/mm/shadow/common.c Thu Jun 05 10:36:19 2008 +0100
@@ -1738,6 +1738,11 @@ int sh_remove_write_access(struct vcpu *
gfn = mfn_to_gfn(v->domain, gmfn);
GUESS(0xffff810000000000UL + (gfn << PAGE_SHIFT), 4);
GUESS(0x0000010000000000UL + (gfn << PAGE_SHIFT), 4);
+ /*
+ * 64bit Solaris kernel page map at
+ * kpm_vbase; 0xfffffe0000000000UL
+ */
+ GUESS(0xfffffe0000000000UL + (gfn << PAGE_SHIFT), 4);
}
#endif /* CONFIG_PAGING_LEVELS >= 4 */
diff -r 02132fc864b4 -r 24c86abbb387 xen/arch/x86/mm/shadow/multi.c
--- a/xen/arch/x86/mm/shadow/multi.c Thu Jun 05 10:34:01 2008 +0100
+++ b/xen/arch/x86/mm/shadow/multi.c Thu Jun 05 10:36:19 2008 +0100
@@ -4007,7 +4007,9 @@ int sh_rm_write_access_from_l1(struct vc
shadow_l1e_t *sl1e;
int done = 0;
int flags;
+#if SHADOW_OPTIMIZATIONS & SHOPT_WRITABLE_HEURISTIC
mfn_t base_sl1mfn = sl1mfn; /* Because sl1mfn changes in the foreach */
+#endif
SHADOW_FOREACH_L1E(sl1mfn, sl1e, 0, done,
{
diff -r 02132fc864b4 -r 24c86abbb387 xen/include/asm-x86/perfc_defn.h
--- a/xen/include/asm-x86/perfc_defn.h Thu Jun 05 10:34:01 2008 +0100
+++ b/xen/include/asm-x86/perfc_defn.h Thu Jun 05 10:36:19 2008 +0100
@@ -77,8 +77,7 @@ PERFCOUNTER(shadow_writeable_h_1, "shad
PERFCOUNTER(shadow_writeable_h_1, "shadow writeable: 32b w2k3")
PERFCOUNTER(shadow_writeable_h_2, "shadow writeable: 32pae w2k3")
PERFCOUNTER(shadow_writeable_h_3, "shadow writeable: 64b w2k3")
-PERFCOUNTER(shadow_writeable_h_4, "shadow writeable: 32b linux low")
-PERFCOUNTER(shadow_writeable_h_5, "shadow writeable: 32b linux high")
+PERFCOUNTER(shadow_writeable_h_4, "shadow writeable: linux/solaris")
PERFCOUNTER(shadow_writeable_bf, "shadow writeable brute-force")
PERFCOUNTER(shadow_mappings, "shadow removes all mappings")
PERFCOUNTER(shadow_mappings_bf, "shadow rm-mappings brute-force")
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