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Re: svn commit: r1730617 -/subversion/trunk/subversion/libsvn_repos/log.c

From: Stefan Fuhrmann <stefanfuhrmann_at_alice-dsl.de>
Date: Fri, 19 Feb 2016 08:37:41 +0100

On 15.02.2016 23:45, Bert Huijben wrote:
> Are you sure the pool arguments are in the right order here?
>
> The usual order is result_pool, scratch_pool while most of the calls here appear
> to use the opposite order.

The pool usage is correct but somewhat confusing.
r1731160 fixes that.

-- Stefan^2.

>
> Bert
>
> Sent from Mail <https://go.microsoft.com/fwlink/?LinkId=550986> for Windows 10
>
> *From: *stefan2_at_apache.org <mailto:stefan2_at_apache.org>
> *Sent: *maandag 15 februari 2016 22:47
> *To: *commits_at_subversion.apache.org <mailto:commits_at_subversion.apache.org>
> *Subject: *svn commit: r1730617 -/subversion/trunk/subversion/libsvn_repos/log.c
>
> Author: stefan2
>
> Date: Mon Feb 15 21:47:00 2016
>
> New Revision: 1730617
>
> URL: http://svn.apache.org/viewvc?rev=1730617&view=rev
>
> Log:
>
> Continue work on the svn_repos_get_logs4 to svn_repos_get_logs5 migration:
>
> Switch the last svn_fs_paths_changed2 call to svn_fs_paths_changed3.
>
> * subversion/libsvn_repos/log.c
>
> (fs_mergeinfo_changed): No longer fetch the whole changes list. However,
>
> we need to iterate twice for best total performance
>
> and we need to minimize FS iterator lifetimes.
>
> Modified:
>
> subversion/trunk/subversion/libsvn_repos/log.c
>
> Modified: subversion/trunk/subversion/libsvn_repos/log.c
>
> URL:
> http://svn.apache.org/viewvc/subversion/trunk/subversion/libsvn_repos/log.c?rev=1730617&r1=1730616&r2=1730617&view=diff
>
> ==============================================================================
>
> --- subversion/trunk/subversion/libsvn_repos/log.c (original)
>
> +++ subversion/trunk/subversion/libsvn_repos/log.c Mon Feb 15 21:47:00 2016
>
> @@ -631,11 +631,11 @@ fs_mergeinfo_changed(svn_mergeinfo_catal
>
> apr_pool_t *scratch_pool)
>
> {
>
> svn_fs_root_t *root;
>
> - apr_pool_t *iterpool;
>
> - apr_hash_index_t *hi;
>
> + apr_pool_t *iterpool, *iterator_pool;
>
> + svn_fs_path_change_iterator_t *iterator;
>
> + svn_fs_path_change3_t *change;
>
> svn_boolean_t any_mergeinfo = FALSE;
>
> svn_boolean_t any_copy = FALSE;
>
> - apr_hash_t *changes;
>
> /* Initialize return variables. */
>
> *deleted_mergeinfo_catalog = svn_hash__make(result_pool);
>
> @@ -645,55 +645,69 @@ fs_mergeinfo_changed(svn_mergeinfo_catal
>
> if (rev == 0)
>
> return SVN_NO_ERROR;
>
> + /* FS iterators are potentially heavy objects.
>
> + * Hold them in a separate pool to clean them up asap. */
>
> + iterator_pool = svn_pool_create(scratch_pool);
>
> +
>
> /* We're going to use the changed-paths information for REV to
>
> narrow down our search. */
>
> SVN_ERR(svn_fs_revision_root(&root, fs, rev, scratch_pool));
>
> - SVN_ERR(svn_fs_paths_changed2(&changes, root, scratch_pool));
>
> + SVN_ERR(svn_fs_paths_changed3(&iterator, root, iterator_pool,
>
> + scratch_pool));
>
> + SVN_ERR(svn_fs_path_change_get(&change, iterator));
>
> /* Look for copies and (potential) mergeinfo changes.
>
> - We will use both flags to take shortcuts further down the road. */
>
> - for (hi = apr_hash_first(scratch_pool, changes);
>
> - hi;
>
> - hi = apr_hash_next(hi))
>
> - {
>
> - svn_fs_path_change2_t *change = apr_hash_this_val(hi);
>
> + We will use both flags to take shortcuts further down the road.
>
> + The critical information here is whether there are any copies
>
> + because that greatly influences the costs for log processing.
>
> + So, it is faster to iterate over the changes twice - in the worst
>
> + case b/c most times there is no m/i at all and we exit out early
>
> + without any overhead.
>
> + */
>
> + while (change && (!any_mergeinfo || !any_copy))
>
> + {
>
> /* If there was a prop change and we are not positive that _no_
>
> mergeinfo change happened, we must assume that it might have. */
>
> if (change->mergeinfo_mod != svn_tristate_false && change->prop_mod)
>
> any_mergeinfo = TRUE;
>
> - switch (change->change_kind)
>
> - {
>
> - case svn_fs_path_change_add:
>
> - case svn_fs_path_change_replace:
>
> - any_copy = TRUE;
>
> - break;
>
> + if ( (change->change_kind == svn_fs_path_change_add)
>
> + || (change->change_kind == svn_fs_path_change_replace))
>
> + any_copy = TRUE;
>
> - default:
>
> - break;
>
> - }
>
> + SVN_ERR(svn_fs_path_change_get(&change, iterator));
>
> }
>
> /* No potential mergeinfo changes? We're done. */
>
> if (! any_mergeinfo)
>
> - return SVN_NO_ERROR;
>
> + {
>
> + svn_pool_destroy(iterator_pool);
>
> + return SVN_NO_ERROR;
>
> + }
>
> +
>
> + /* There is or may be some m/i change. Look closely now. */
>
> + svn_pool_clear(iterator_pool);
>
> + SVN_ERR(svn_fs_paths_changed3(&iterator, root, iterator_pool,
>
> + scratch_pool));
>
> /* Loop over changes, looking for anything that might carry an
>
> svn:mergeinfo change and is one of our paths of interest, or a
>
> child or [grand]parent directory thereof. */
>
> iterpool = svn_pool_create(scratch_pool);
>
> - for (hi = apr_hash_first(scratch_pool, changes);
>
> - hi;
>
> - hi = apr_hash_next(hi))
>
> + while (TRUE)
>
> {
>
> const char *changed_path;
>
> - svn_fs_path_change2_t *change = apr_hash_this_val(hi);
>
> const char *base_path = NULL;
>
> svn_revnum_t base_rev = SVN_INVALID_REVNUM;
>
> svn_fs_root_t *base_root = NULL;
>
> svn_string_t *prev_mergeinfo_value = NULL, *mergeinfo_value;
>
> + /* Next change. */
>
> + SVN_ERR(svn_fs_path_change_get(&change, iterator));
>
> + if (!change)
>
> + break;
>
> +
>
> /* Cheap pre-checks that don't require memory allocation etc. */
>
> /* No mergeinfo change? -> nothing to do here. */
>
> @@ -705,7 +719,7 @@ fs_mergeinfo_changed(svn_mergeinfo_catal
>
> continue;
>
> /* Begin actual processing */
>
> - changed_path = apr_hash_this_key(hi);
>
> + changed_path = change->path.data;
>
> svn_pool_clear(iterpool);
>
> switch (change->change_kind)
>
> @@ -863,6 +877,8 @@ fs_mergeinfo_changed(svn_mergeinfo_catal
>
> }
>
> svn_pool_destroy(iterpool);
>
> + svn_pool_destroy(iterator_pool);
>
> +
>
> return SVN_NO_ERROR;
>
> }
>
Received on 2016-02-19 08:36:07 CET

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