Re: [Qemu-devel] [PATCH 06/17] qsp: Simplify how qsp_report() prints

["Dr. David Alan Gilbert" <dgilbert@redhat.com>]

* Markus Armbruster (armbru@redhat.com) wrote:
> qsp_report() takes an fprintf()-like callback and a FILE * to pass to
> it.
> 
> Its only caller hmp_sync_profile() passes monitor_fprintf() and the
> current monitor cast to FILE *.  monitor_fprintf() casts it right
> back, and is otherwise identical to monitor_printf().  The
> type-punning is ugly.
> 
> Drop the callback, and call qemu_printf() instead.
> 
> Signed-off-by: Markus Armbruster <armbru@redhat.com>

Reviewed-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

> ---
>  include/block/qapi.h |  1 +
>  include/qemu/qsp.h   |  6 ++----
>  monitor.c            |  2 +-
>  util/qsp.c           | 21 +++++++++++----------
>  4 files changed, 15 insertions(+), 15 deletions(-)
> 
> diff --git a/include/block/qapi.h b/include/block/qapi.h
> index 83bdb098bd..a891f43b9c 100644
> --- a/include/block/qapi.h
> +++ b/include/block/qapi.h
> @@ -27,6 +27,7 @@
>  
>  #include "block/block.h"
>  #include "block/snapshot.h"
> +#include "qemu/fprintf-fn.h"
>  
>  BlockDeviceInfo *bdrv_block_device_info(BlockBackend *blk,
>                                          BlockDriverState *bs, Error **errp);
> diff --git a/include/qemu/qsp.h b/include/qemu/qsp.h
> index a94c464f90..bf36aabfa8 100644
> --- a/include/qemu/qsp.h
> +++ b/include/qemu/qsp.h
> @@ -11,15 +11,13 @@
>  #ifndef QEMU_QSP_H
>  #define QEMU_QSP_H
>  
> -#include "qemu/fprintf-fn.h"
> -
>  enum QSPSortBy {
>      QSP_SORT_BY_TOTAL_WAIT_TIME,
>      QSP_SORT_BY_AVG_WAIT_TIME,
>  };
>  
> -void qsp_report(FILE *f, fprintf_function cpu_fprintf, size_t max,
> -                enum QSPSortBy sort_by, bool callsite_coalesce);
> +void qsp_report(size_t max, enum QSPSortBy sort_by,
> +                bool callsite_coalesce);
>  
>  bool qsp_is_enabled(void);
>  void qsp_enable(void);
> diff --git a/monitor.c b/monitor.c
> index 7573689585..1650ceec3a 100644
> --- a/monitor.c
> +++ b/monitor.c
> @@ -1336,7 +1336,7 @@ static void hmp_info_sync_profile(Monitor *mon, const QDict *qdict)
>      enum QSPSortBy sort_by;
>  
>      sort_by = mean ? QSP_SORT_BY_AVG_WAIT_TIME : QSP_SORT_BY_TOTAL_WAIT_TIME;
> -    qsp_report((FILE *)mon, monitor_fprintf, max, sort_by, coalesce);
> +    qsp_report(max, sort_by, coalesce);
>  }
>  
>  static void hmp_info_history(Monitor *mon, const QDict *qdict)
> diff --git a/util/qsp.c b/util/qsp.c
> index 410f1ba004..5264c97342 100644
> --- a/util/qsp.c
> +++ b/util/qsp.c
> @@ -56,7 +56,9 @@
>   *   Critical-Section Execution to Improve the Performance of Multithreaded
>   *   Applications", USENIX ATC'12.
>   */
> +
>  #include "qemu/osdep.h"
> +#include "qemu/qemu-print.h"
>  #include "qemu/thread.h"
>  #include "qemu/timer.h"
>  #include "qemu/qht.h"
> @@ -678,8 +680,7 @@ static gboolean qsp_tree_report(gpointer key, gpointer value, gpointer udata)
>      return FALSE;
>  }
>  
> -static void
> -pr_report(const QSPReport *rep, FILE *f, fprintf_function pr)
> +static void pr_report(const QSPReport *rep)
>  {
>      char *dashes;
>      size_t max_len = 0;
> @@ -702,15 +703,15 @@ pr_report(const QSPReport *rep, FILE *f, fprintf_function pr)
>      /* white space to leave to the right of "Call site" */
>      callsite_rspace = callsite_len - strlen("Call site");
>  
> -    pr(f, "Type               Object  Call site%*s  Wait Time (s)  "
> -       "       Count  Average (us)\n", callsite_rspace, "");
> +    qemu_printf("Type               Object  Call site%*s  Wait Time (s)  "
> +                "       Count  Average (us)\n", callsite_rspace, "");
>  
>      /* build a horizontal rule with dashes */
>      n_dashes = 79 + callsite_rspace;
>      dashes = g_malloc(n_dashes + 1);
>      memset(dashes, '-', n_dashes);
>      dashes[n_dashes] = '\0';
> -    pr(f, "%s\n", dashes);
> +    qemu_printf("%s\n", dashes);
>  
>      for (i = 0; i < rep->n_entries; i++) {
>          const QSPReportEntry *e = &rep->entries[i];
> @@ -726,11 +727,11 @@ pr_report(const QSPReport *rep, FILE *f, fprintf_function pr)
>                                 e->callsite_at,
>                                 callsite_len - (int)strlen(e->callsite_at), "",
>                                 e->time_s, e->n_acqs, e->ns_avg * 1e-3);
> -        pr(f, "%s", s->str);
> +        qemu_printf("%s", s->str);
>          g_string_free(s, TRUE);
>      }
>  
> -    pr(f, "%s\n", dashes);
> +    qemu_printf("%s\n", dashes);
>      g_free(dashes);
>  }
>  
> @@ -746,8 +747,8 @@ static void report_destroy(QSPReport *rep)
>      g_free(rep->entries);
>  }
>  
> -void qsp_report(FILE *f, fprintf_function cpu_fprintf, size_t max,
> -                enum QSPSortBy sort_by, bool callsite_coalesce)
> +void qsp_report(size_t max, enum QSPSortBy sort_by,
> +                bool callsite_coalesce)
>  {
>      GTree *tree = g_tree_new_full(qsp_tree_cmp, &sort_by, g_free, NULL);
>      QSPReport rep;
> @@ -762,7 +763,7 @@ void qsp_report(FILE *f, fprintf_function cpu_fprintf, size_t max,
>      g_tree_foreach(tree, qsp_tree_report, &rep);
>      g_tree_destroy(tree);
>  
> -    pr_report(&rep, f, cpu_fprintf);
> +    pr_report(&rep);
>      report_destroy(&rep);
>  }
>  
> -- 
> 2.17.2
> 
--
Dr. David Alan Gilbert / dgilbert@redhat.com / Manchester, UK