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openSUSE:12.2
xen
xenpaging.speedup-page-out.policy_choose_victim...
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File xenpaging.speedup-page-out.policy_choose_victim.patch of Package xen
Skip longs with all bits set. Iterate only once over the entire gfn range. --- tools/xenpaging/policy_default.c | 55 ++++++++++++++++++++++++++------------- 1 file changed, 38 insertions(+), 17 deletions(-) Index: xen-4.1.2-testing/tools/xenpaging/policy_default.c =================================================================== --- xen-4.1.2-testing.orig/tools/xenpaging/policy_default.c +++ xen-4.1.2-testing/tools/xenpaging/policy_default.c @@ -80,34 +80,55 @@ int policy_init(xenpaging_t *paging) int policy_choose_victim(xenpaging_t *paging, xenpaging_victim_t *victim) { xc_interface *xch = paging->xc_handle; - unsigned long wrap = current_gfn; + unsigned long i; - do + /* One iteration over all possible gfns */ + for ( i = 0; i < max_pages; i++) { current_gfn++; if ( current_gfn >= max_pages ) current_gfn = 0; - /* Could not nominate any gfn */ - if ( wrap == current_gfn ) + + if ( (current_gfn & (BITS_PER_LONG - 1)) == 0 ) { - paging->use_poll_timeout = 1; - /* Count wrap arounds */ - unconsumed_cleared++; - /* Force retry every few seconds (depends on poll() timeout) */ - if ( unconsumed_cleared > 123) + /* All gfns busy */ + if ( ~bitmap[current_gfn >> ORDER_LONG] == 0 || ~unconsumed[current_gfn >> ORDER_LONG] == 0 ) { - /* Force retry of unconsumed gfns */ - bitmap_clear(unconsumed, max_pages); - unconsumed_cleared = 0; - DPRINTF("clearing unconsumed, wrap %lx", wrap); - /* One more round before returning ENOSPC */ + current_gfn += BITS_PER_LONG; + i += BITS_PER_LONG; continue; } - victim->gfn = INVALID_MFN; - return -ENOSPC; } + + /* gfn busy */ + if ( test_bit(current_gfn, bitmap) ) + continue; + + /* gfn already tested */ + if ( test_bit(current_gfn, unconsumed) ) + continue; + + /* gfn found */ + break; + } + + /* Could not nominate any gfn */ + if ( i >= max_pages ) + { + paging->use_poll_timeout = 1; + /* Count wrap arounds */ + unconsumed_cleared++; + /* Force retry every few seconds (depends on poll() timeout) */ + if ( unconsumed_cleared > 123) + { + /* Force retry of unconsumed gfns in next call */ + bitmap_clear(unconsumed, max_pages); + unconsumed_cleared = 0; + DPRINTF("clearing unconsumed, current_gfn %lx", current_gfn); + } + victim->gfn = INVALID_MFN; + return -ENOSPC; } - while ( test_bit(current_gfn, bitmap) || test_bit(current_gfn, unconsumed) ); set_bit(current_gfn, unconsumed); victim->gfn = current_gfn;
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