[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 12 of 20] xenpaging: retry unpageable gfns
# HG changeset patch # User Olaf Hering <olaf@xxxxxxxxx> # Date 1321804961 -3600 # Node ID 1e343a57860ea0d75d862076eec695b81219092e # Parent e74c938d38518f6f6344c9bcc6b7c8916a073594 xenpaging: retry unpageable gfns Nomination of gfns can fail, but may succeed later. Thats the case for a guest that starts ballooned. v2: - print debug when clearing uncosumed happens Signed-off-by: Olaf Hering <olaf@xxxxxxxxx> diff -r e74c938d3851 -r 1e343a57860e 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 +88,21 @@ 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; + DPRINTF("clearing unconsumed, wrap %lx", wrap); + /* 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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