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openSUSE:12.2
xen
xenpaging.speedup-page-out.patch
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File xenpaging.speedup-page-out.patch of Package xen
xenpaging: no poll timeout while page-out is in progress The main loop calls xenpaging_wait_for_event_or_timeout() unconditionally before doing any work. This function calls poll() with a timeout of 100ms. As a result the page-out process is very slow due to the delay in poll(). Call poll() without timeout so that it returns immediately until the page-out is done. Page-out is done when either the policy finds no more pages to nominate or when the requested number of pages is reached. The condition is cleared when a watch event arrives, so that processing the new target is not delayed once again by poll(). Signed-off-by: Olaf Hering <olaf@aepfle.de> --- tools/xenpaging/policy_default.c | 1 + tools/xenpaging/xenpaging.c | 12 +++++++++++- tools/xenpaging/xenpaging.h | 1 + 3 files changed, 13 insertions(+), 1 deletion(-) 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 @@ -90,6 +90,7 @@ int policy_choose_victim(xenpaging_t *pa /* Could not nominate any gfn */ if ( wrap == current_gfn ) { + paging->use_poll_timeout = 1; /* Count wrap arounds */ unconsumed_cleared++; /* Force retry every few seconds (depends on poll() timeout) */ Index: xen-4.1.2-testing/tools/xenpaging/xenpaging.c =================================================================== --- xen-4.1.2-testing.orig/tools/xenpaging/xenpaging.c +++ xen-4.1.2-testing/tools/xenpaging/xenpaging.c @@ -85,6 +85,7 @@ static int xenpaging_wait_for_event_or_t struct pollfd fd[2]; int port; int rc; + int timeout; /* Wait for event channel and xenstore */ fd[0].fd = xc_evtchn_fd(xce); @@ -92,7 +93,9 @@ static int xenpaging_wait_for_event_or_t fd[1].fd = xs_fileno(paging->xs_handle); fd[1].events = POLLIN | POLLERR; - rc = poll(fd, 2, 100); + /* No timeout while page-out is still in progress */ + timeout = paging->use_poll_timeout ? 100 : 0; + rc = poll(fd, 2, timeout); if ( rc < 0 ) { if (errno == EINTR) @@ -134,6 +137,8 @@ static int xenpaging_wait_for_event_or_t if ( target_tot_pages < 0 || target_tot_pages > paging->max_pages ) target_tot_pages = paging->max_pages; paging->target_tot_pages = target_tot_pages; + /* Disable poll() delay while new target is not yet reached */ + paging->use_poll_timeout = 0; DPRINTF("new target_tot_pages %d\n", target_tot_pages); } free(val); @@ -1002,6 +1007,11 @@ int main(int argc, char *argv[]) } resume_pages(paging, num); } + /* Now target was reached, enable poll() timeout */ + else + { + paging->use_poll_timeout = 1; + } } DPRINTF("xenpaging got signal %d\n", interrupted); Index: xen-4.1.2-testing/tools/xenpaging/xenpaging.h =================================================================== --- xen-4.1.2-testing.orig/tools/xenpaging/xenpaging.h +++ xen-4.1.2-testing/tools/xenpaging/xenpaging.h @@ -52,6 +52,7 @@ typedef struct xenpaging { int num_paged_out; int target_tot_pages; int policy_mru_size; + int use_poll_timeout; int debug; unsigned long pagein_queue[XENPAGING_PAGEIN_QUEUE_SIZE]; } xenpaging_t;
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