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openSUSE:12.2
xen
24223-xenpaging_watch_the_guests_memory-target-...
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File 24223-xenpaging_watch_the_guests_memory-target-tot_pages_xenstore_value.patch of Package xen
changeset: 24223:9e3c2ef70c8a user: Olaf Hering <olaf@aepfle.de> date: Sun Nov 20 17:02:47 2011 +0100 files: tools/xenpaging/xenpaging.c description: xenpaging: watch the guests memory/target-tot_pages xenstore value Subsequent patches will use xenstored to store the numbers of pages xenpaging is suppose to page-out. Remove num_pages and use target_pages instead. Signed-off-by: Olaf Hering <olaf@aepfle.de> Committed-by: Ian Jackson <ian.jackson.citrix.com> --- tools/xenpaging/xenpaging.c | 51 +++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 50 insertions(+), 1 deletion(-) 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 @@ -19,8 +19,10 @@ */ #define _XOPEN_SOURCE 600 +#define _GNU_SOURCE #include <inttypes.h> +#include <stdio.h> #include <stdlib.h> #include <stdarg.h> #include <time.h> @@ -35,6 +37,10 @@ #include "policy.h" #include "xenpaging.h" +/* Defines number of mfns a guest should use at a time, in KiB */ +#define WATCH_TARGETPAGES "memory/target-tot_pages" +static char *watch_target_tot_pages; +static char *dom_path; static char watch_token[16]; static char filename[80]; static int interrupted; @@ -72,7 +78,7 @@ static int xenpaging_wait_for_event_or_t { xc_interface *xch = paging->xc_handle; xc_evtchn *xce = paging->mem_event.xce_handle; - char **vec; + char **vec, *val; unsigned int num; struct pollfd fd[2]; int port; @@ -111,6 +117,25 @@ static int xenpaging_wait_for_event_or_t rc = 0; } } + else if ( strcmp(vec[XS_WATCH_PATH], watch_target_tot_pages) == 0 ) + { + int ret, target_tot_pages; + val = xs_read(paging->xs_handle, XBT_NULL, vec[XS_WATCH_PATH], NULL); + if ( val ) + { + ret = sscanf(val, "%d", &target_tot_pages); + if ( ret > 0 ) + { + /* KiB to pages */ + target_tot_pages >>= 2; + if ( target_tot_pages < 0 || target_tot_pages > paging->max_pages ) + target_tot_pages = paging->max_pages; + paging->target_tot_pages = target_tot_pages; + DPRINTF("new target_tot_pages %d\n", target_tot_pages); + } + free(val); + } + } free(vec); } } @@ -216,6 +241,25 @@ static xenpaging_t *xenpaging_init(domid goto err; } + /* Watch xenpagings working target */ + dom_path = xs_get_domain_path(paging->xs_handle, domain_id); + if ( !dom_path ) + { + PERROR("Could not find domain path\n"); + goto err; + } + if ( asprintf(&watch_target_tot_pages, "%s/%s", dom_path, WATCH_TARGETPAGES) < 0 ) + { + PERROR("Could not alloc watch path\n"); + goto err; + } + DPRINTF("watching '%s'\n", watch_target_tot_pages); + if ( xs_watch(paging->xs_handle, watch_target_tot_pages, "") == false ) + { + PERROR("Could not bind to xenpaging watch\n"); + goto err; + } + p = getenv("XENPAGING_POLICY_MRU_SIZE"); if ( p && *p ) { @@ -342,6 +386,8 @@ static xenpaging_t *xenpaging_init(domid free(paging->mem_event.ring_page); } + free(dom_path); + free(watch_target_tot_pages); free(paging->bitmap); free(paging); } @@ -357,6 +403,9 @@ static int xenpaging_teardown(xenpaging_ if ( paging == NULL ) return 0; + xs_unwatch(paging->xs_handle, watch_target_tot_pages, ""); + xs_unwatch(paging->xs_handle, "@releaseDomain", watch_token); + xch = paging->xc_handle; paging->xc_handle = NULL; /* Tear down domain paging in Xen */
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