mirror of
https://github.com/xen-project/xen.git
synced 2026-10-29 18:50:05 +01:00
Dongli Zhang
df36d82e3f
As both xen-netfront and xen-blkfront support multi-queue, they would consume a lot of grant table references when there are many paravirtual devices and vcpus assigned to guest. Guest domU might panic or hang due to grant allocation failure when nr_grant_frames in guest has reached its max value. This utility would help the administrators to diagnose xen issue. There is only one command gnttab_query_size so far to monitor the guest grant table frame usage on dom0 side so that it is not required to debug on guest kernel side for crash/hang analysis anymore. It is extensible for adding new commands for more diagnostic functions and the framework of xen-diag.c is from xen-livepatch.c. Signed-off-by: Dongli Zhang <dongli.zhang@oracle.com> Acked-by: Wei Liu <wei.liu2@citrix.com>
130 lines
2.8 KiB
C
130 lines
2.8 KiB
C
/*
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* Copyright (c) 2017 Oracle and/or its affiliates. All rights reserved.
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*/
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#include <stdio.h>
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#include <stdlib.h>
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#include <err.h>
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#include <errno.h>
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#include <unistd.h>
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#include <string.h>
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#include <xenctrl.h>
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#include <xen/errno.h>
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#include <xen-tools/libs.h>
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static xc_interface *xch;
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#define ARRAY_SIZE(a) (sizeof (a) / sizeof ((a)[0]))
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void show_help(void)
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{
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fprintf(stderr,
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"xen-diag: xen diagnostic utility\n"
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"Usage: xen-diag command [args]\n"
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"Commands:\n"
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" help display this help\n"
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" gnttab_query_size <domid> dump the current and max grant frames for <domid>\n");
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}
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/* wrapper function */
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static int help_func(int argc, char *argv[])
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{
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show_help();
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return 0;
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}
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static int gnttab_query_size_func(int argc, char *argv[])
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{
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int domid, rc = 1;
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struct gnttab_query_size query;
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if ( argc != 1 )
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{
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show_help();
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return rc;
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}
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domid = strtol(argv[0], NULL, 10);
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query.dom = domid;
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rc = xc_gnttab_query_size(xch, &query);
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if ( rc == 0 && (query.status == GNTST_okay) )
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printf("domid=%d: nr_frames=%d, max_nr_frames=%d\n",
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query.dom, query.nr_frames, query.max_nr_frames);
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return rc == 0 && (query.status == GNTST_okay) ? 0 : 1;
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}
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struct {
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const char *name;
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int (*function)(int argc, char *argv[]);
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} main_options[] = {
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{ "help", help_func },
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{ "gnttab_query_size", gnttab_query_size_func},
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};
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int main(int argc, char *argv[])
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{
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int ret, i;
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/*
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* Set stdout to be unbuffered to avoid having to fflush when
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* printing without a newline.
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*/
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setvbuf(stdout, NULL, _IONBF, 0);
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if ( argc <= 1 )
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{
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show_help();
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return 0;
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}
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for ( i = 0; i < ARRAY_SIZE(main_options); i++ )
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if ( !strncmp(main_options[i].name, argv[1], strlen(argv[1])) )
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break;
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if ( i == ARRAY_SIZE(main_options) )
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{
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show_help();
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return 0;
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}
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else
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{
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xch = xc_interface_open(0, 0, 0);
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if ( !xch )
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{
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fprintf(stderr, "failed to get the handler\n");
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return 0;
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}
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ret = main_options[i].function(argc - 2, argv + 2);
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xc_interface_close(xch);
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}
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/*
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* Exitcode 0 for success.
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* Exitcode 1 for an error.
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* Exitcode 2 if the operation should be retried for any reason (e.g. a
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* timeout or because another operation was in progress).
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*/
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#define EXIT_TIMEOUT (EXIT_FAILURE + 1)
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BUILD_BUG_ON(EXIT_SUCCESS != 0);
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BUILD_BUG_ON(EXIT_FAILURE != 1);
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BUILD_BUG_ON(EXIT_TIMEOUT != 2);
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switch ( ret )
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{
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case 0:
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return EXIT_SUCCESS;
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case EAGAIN:
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case EBUSY:
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return EXIT_TIMEOUT;
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default:
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return EXIT_FAILURE;
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}
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}
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