[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 11 of 24] xenpaging: retry unpageable gfns
# HG changeset patch # User Olaf Hering <olaf@xxxxxxxxx> # Date 1317653608 -7200 # Node ID 3924c1ef71ee975b4556ca7766b730dfa3e12295 # Parent b85b2fa9a485cdd815eb9eb3e3a7794b462fa814 xenpaging: retry unpageable gfns Nomination of gfns can fail, but may succeed later. Thats the case for a guest that starts ballooned. Signed-off-by: Olaf Hering <olaf@xxxxxxxxx> diff -r b85b2fa9a485 -r 3924c1ef71ee tools/xenpaging/policy_default.c --- a/tools/xenpaging/policy_default.c +++ b/tools/xenpaging/policy_default.c @@ -32,6 +32,7 @@ static unsigned int i_mru; static unsigned int mru_size; static unsigned long *bitmap; static unsigned long *unconsumed; +static unsigned int unconsumed_cleared; static unsigned long current_gfn; static unsigned long max_pages; @@ -87,8 +88,20 @@ int policy_choose_victim(xenpaging_t *pa current_gfn++; if ( current_gfn >= max_pages ) current_gfn = 0; + /* Could not nominate any gfn */ if ( wrap == current_gfn ) { + /* Count wrap arounds */ + unconsumed_cleared++; + /* Force retry every few seconds (depends on poll() timeout) */ + if ( unconsumed_cleared > 123) + { + /* Force retry of unconsumed gfns */ + bitmap_clear(unconsumed, max_pages); + unconsumed_cleared = 0; + /* One more round before returning ENOSPC */ + continue; + } victim->gfn = INVALID_MFN; return -ENOSPC; } _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxxxxxxxx http://lists.xensource.com/xen-devel
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