30 lines
1.0 KiB
Diff
30 lines
1.0 KiB
Diff
# HG changeset patch
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# User Keir Fraser <keir.fraser@citrix.com>
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# Date 1229599705 0
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# Node ID c2dad16819b54c2c4b2bb0e9e89f71c279eaf156
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# Parent b33b745cd5ec3213feeb1d99e421e79cc5f12370
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x86, shadow: Avoid duplicates in fixup tables.
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Avoid entering duplicates in fixup tables, reducing fixup evictions.
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Signed-off-by: Gianluca Guida <gianluca.guida@eu.citrix.com>
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--- a/xen/arch/x86/mm/shadow/common.c
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+++ b/xen/arch/x86/mm/shadow/common.c
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@@ -626,6 +626,15 @@ void oos_fixup_add(struct vcpu *v, mfn_t
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idx = (idx + 1) % SHADOW_OOS_PAGES;
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if ( mfn_x(oos[idx]) == mfn_x(gmfn) )
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{
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+ int i;
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+ for ( i = 0; i < SHADOW_OOS_FIXUPS; i++ )
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+ {
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+ if ( mfn_valid(oos_fixup[idx].smfn[i])
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+ && (mfn_x(oos_fixup[idx].smfn[i]) == mfn_x(smfn))
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+ && (oos_fixup[idx].off[i] == off) )
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+ return;
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+ }
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+
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next = oos_fixup[idx].next;
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if ( mfn_x(oos_fixup[idx].smfn[next]) != INVALID_MFN )
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