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stasis: Segment channel snapshot to reduce creation cost.

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When a channel snapshot was created it used to be done
from scratch, copying all data (many strings). This incurs
a cost when doing so.

This change segments the channel snapshot into different
components which can be reused if unchanged from the
previous snapshot creation, reducing the cost. In normal
cases this results in some pointers being copied with
reference count being bumped, some integers being set,
and a string or two copied. The other benefit is that it
is now possible to determine if a channel snapshot update
is redundant and thus stop it before a message is published
to stasis.

The specific segments in the channel snapshot were split up
based on whether they are changed together, how often they
are changed, and their general grouping. In practice only
1 (or 0) of the segments actually get changed in normal
operation.

Invalidation is done by setting a flag on the channel when
the segment source is changed, forcing creation of a new
segment when the channel snapshot is created.

ASTERISK-28119

Change-Id: I5d7ef3df963a88ac47bc187d73c5225c315f8423
This commit is contained in:
Joshua Colp
2018-11-07 13:18:34 -04:00
parent d0ccbb3377
commit 50ac85cb40
32 changed files with 878 additions and 470 deletions
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10
main/channel.c
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@@ -6761,6 +6761,12 @@ static void channel_do_masquerade(struct ast_channel *original, struct ast_chann
ast_channel_name(clonechan), ast_channel_state(clonechan),
ast_channel_name(original), ast_channel_state(original));
/* When all is said and done force new snapshot segments so they are
* up to date.
*/
ast_set_flag(ast_channel_snapshot_segment_flags(original), AST_FLAGS_ALL);
ast_set_flag(ast_channel_snapshot_segment_flags(clonechan), AST_FLAGS_ALL);
/*
* Remember the original read/write formats. We turn off any
* translation on either one
@@ -7183,6 +7189,7 @@ void ast_channel_set_caller(struct ast_channel *chan, const struct ast_party_cal
ast_channel_lock(chan);
ast_party_caller_set(ast_channel_caller(chan), caller, update);
ast_channel_snapshot_invalidate_segment(chan, AST_CHANNEL_SNAPSHOT_INVALIDATE_CALLER);
ast_channel_unlock(chan);
}
@@ -7195,6 +7202,7 @@ void ast_channel_set_caller_event(struct ast_channel *chan, const struct ast_par
ast_channel_lock(chan);
ast_party_caller_set(ast_channel_caller(chan), caller, update);
ast_channel_snapshot_invalidate_segment(chan, AST_CHANNEL_SNAPSHOT_INVALIDATE_CALLER);
ast_channel_publish_snapshot(chan);
ast_channel_unlock(chan);
}
@@ -8120,6 +8128,7 @@ void ast_channel_set_connected_line(struct ast_channel *chan, const struct ast_p
ast_channel_lock(chan);
ast_party_connected_line_set(ast_channel_connected(chan), connected, update);
ast_channel_snapshot_invalidate_segment(chan, AST_CHANNEL_SNAPSHOT_INVALIDATE_CONNECTED);
ast_channel_publish_snapshot(chan);
ast_channel_unlock(chan);
}
@@ -8930,6 +8939,7 @@ void ast_channel_set_redirecting(struct ast_channel *chan, const struct ast_part
ast_channel_lock(chan);
ast_party_redirecting_set(ast_channel_redirecting(chan), redirecting, update);
ast_channel_snapshot_invalidate_segment(chan, AST_CHANNEL_SNAPSHOT_INVALIDATE_CALLER);
ast_channel_unlock(chan);
}