ia64/xen-unstable

changeset 17787:24c86abbb387

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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@sun.com>
Signed-off-by: Keir Fraser <keir.fraser@citrix.com>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Jun 05 10:36:19 2008 +0100 (2008-06-05)
parents 02132fc864b4
children 129a511d31ee
files xen/arch/x86/mm/shadow/common.c xen/arch/x86/mm/shadow/multi.c xen/include/asm-x86/perfc_defn.h
line diff
     1.1 --- a/xen/arch/x86/mm/shadow/common.c	Thu Jun 05 10:34:01 2008 +0100
     1.2 +++ b/xen/arch/x86/mm/shadow/common.c	Thu Jun 05 10:36:19 2008 +0100
     1.3 @@ -1738,6 +1738,11 @@ int sh_remove_write_access(struct vcpu *
     1.4              gfn = mfn_to_gfn(v->domain, gmfn); 
     1.5              GUESS(0xffff810000000000UL + (gfn << PAGE_SHIFT), 4); 
     1.6              GUESS(0x0000010000000000UL + (gfn << PAGE_SHIFT), 4); 
     1.7 +            /*
     1.8 +             * 64bit Solaris kernel page map at
     1.9 +             * kpm_vbase; 0xfffffe0000000000UL
    1.10 +             */
    1.11 +            GUESS(0xfffffe0000000000UL + (gfn << PAGE_SHIFT), 4);
    1.12          }
    1.13  #endif /* CONFIG_PAGING_LEVELS >= 4 */
    1.14  

     2.1 --- a/xen/arch/x86/mm/shadow/multi.c	Thu Jun 05 10:34:01 2008 +0100
     2.2 +++ b/xen/arch/x86/mm/shadow/multi.c	Thu Jun 05 10:36:19 2008 +0100
     2.3 @@ -4007,7 +4007,9 @@ int sh_rm_write_access_from_l1(struct vc
     2.4      shadow_l1e_t *sl1e;
     2.5      int done = 0;
     2.6      int flags;
     2.7 +#if SHADOW_OPTIMIZATIONS & SHOPT_WRITABLE_HEURISTIC 
     2.8      mfn_t base_sl1mfn = sl1mfn; /* Because sl1mfn changes in the foreach */
     2.9 +#endif
    2.10      
    2.11      SHADOW_FOREACH_L1E(sl1mfn, sl1e, 0, done, 
    2.12      {

     3.1 --- a/xen/include/asm-x86/perfc_defn.h	Thu Jun 05 10:34:01 2008 +0100
     3.2 +++ b/xen/include/asm-x86/perfc_defn.h	Thu Jun 05 10:36:19 2008 +0100
     3.3 @@ -77,8 +77,7 @@ PERFCOUNTER(shadow_writeable,      "shad
     3.4  PERFCOUNTER(shadow_writeable_h_1,  "shadow writeable: 32b w2k3")
     3.5  PERFCOUNTER(shadow_writeable_h_2,  "shadow writeable: 32pae w2k3")
     3.6  PERFCOUNTER(shadow_writeable_h_3,  "shadow writeable: 64b w2k3")
     3.7 -PERFCOUNTER(shadow_writeable_h_4,  "shadow writeable: 32b linux low")
     3.8 -PERFCOUNTER(shadow_writeable_h_5,  "shadow writeable: 32b linux high")
     3.9 +PERFCOUNTER(shadow_writeable_h_4,  "shadow writeable: linux/solaris")
    3.10  PERFCOUNTER(shadow_writeable_bf,   "shadow writeable brute-force")
    3.11  PERFCOUNTER(shadow_mappings,       "shadow removes all mappings")
    3.12  PERFCOUNTER(shadow_mappings_bf,    "shadow rm-mappings brute-force")