On Fri, 10 Sep 2021 19:38:55 +0300
"Yordan Karadzhov (VMware)" <y.karadz@xxxxxxxxx> wrote:
> The current version of the API makes it hard to add multiple sort keys
> to a histogram. The only way to do this is to use the variadic arguments,
> however in order to do this the caller have to know the number of sort
> keys at compile time, because the method overwrite all previously added
> keys. The problem is addressed by splitting tracefs_hist_add_sort_key()
> into two methods - one that overwrite and one that does not.
>
> Signed-off-by: Yordan Karadzhov (VMware) <y.karadz@xxxxxxxxx>
> ---
> include/tracefs.h | 4 +++-
> src/tracefs-hist.c | 21 +++++++++++++++++++--
> 2 files changed, 22 insertions(+), 3 deletions(-)
>
> diff --git a/include/tracefs.h b/include/tracefs.h
> index 64fbb3f..c3fa1d6 100644
> --- a/include/tracefs.h
> +++ b/include/tracefs.h
> @@ -303,7 +303,9 @@ int tracefs_hist_add_key(struct tracefs_hist *hist, const char *key,
> enum tracefs_hist_key_type type);
> int tracefs_hist_add_value(struct tracefs_hist *hist, const char *value);
> int tracefs_hist_add_sort_key(struct tracefs_hist *hist,
> - const char *sort_key, ...);
> + char *sort_key);
Why did you remove the const? The add_sort_key() takes a const and makes a
copy of it.
> +int tracefs_hist_sort_key(struct tracefs_hist *hist,
> + const char *sort_key, ...);
> int tracefs_hist_sort_key_direction(struct tracefs_hist *hist,
> const char *sort_key,
> enum tracefs_hist_sort_direction dir);
> diff --git a/src/tracefs-hist.c b/src/tracefs-hist.c
> index 8501d64..2ea90d9 100644
> --- a/src/tracefs-hist.c
> +++ b/src/tracefs-hist.c
> @@ -453,6 +453,23 @@ add_sort_key(struct tracefs_hist *hist, const char *sort_key, char **list)
> return tracefs_list_add(list, sort_key);
> }
>
Needs a kerneldoc documentation header.
> +int tracefs_hist_add_sort_key(struct tracefs_hist *hist,
> + char *sort_key)
> +{
> + char **list = hist->sort;
> +
> + if (!hist || !sort_key)
> + return -1;
> +
> + list = add_sort_key(hist, sort_key, hist->sort);
> + if (!list)
> + return -1;
> +
> + hist->sort = list;
> +
> + return 0;
> +}
> +
> /**
> * tracefs_hist_add_sort_key - add a key for sorting the histogram
The above name needs to be updated.
> * @hist: The histogram to add the sort key to
> @@ -464,8 +481,8 @@ add_sort_key(struct tracefs_hist *hist, const char *sort_key, char **list)
> *
> * Returns 0 on success, -1 on error.
> */
> -int tracefs_hist_add_sort_key(struct tracefs_hist *hist,
> - const char *sort_key, ...)
> +int tracefs_hist_sort_key(struct tracefs_hist *hist,
How about if we call this:
tracefs_hist_replace_sort_keys()
I think that would be a more intuitive name.
-- Steve
> + const char *sort_key, ...)
> {
> char **list = NULL;
> char **tmp;
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