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FROMLIST: maple_tree: Reduce resets during store setup

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mas_prealloc() may walk partially down the tree before finding that a
split or spanning store is needed.  When the write occurs, relax the
logic on resetting the walk so that partial walks will not restart, but
walks that have gone too far (a store that affects beyond the current
node) should be restarted.

Signed-off-by: Liam R. Howlett <Liam.Howlett@oracle.com>

Link: https://lore.kernel.org/all/20230612203953.2093911-16-Liam.Howlett@oracle.com/
Bug: 274059236
Change-Id: I87dedebae085f067b08caeaf1bd19bb343ff305f
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
This commit is contained in:
Liam R. Howlett 2023-06-12 16:39:52 -04:00 • committed by Treehugger Robot
parent 708234485a
commit e835ffdfbc
1 changed files with 25 additions and 11 deletions
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36
lib/maple_tree.c
View file

@ -5607,20 +5607,34 @@ static inline void mte_destroy_walk(struct maple_enode *enode,
static void mas_wr_store_setup(struct ma_wr_state *wr_mas)
{
if (mas_is_start(wr_mas->mas))
return;
if (unlikely(mas_is_paused(wr_mas->mas)))
mas_reset(wr_mas->mas);
goto reset;
if (!mas_is_start(wr_mas->mas)) {
if (mas_is_none(wr_mas->mas)) {
mas_reset(wr_mas->mas);
} else {
wr_mas->r_max = wr_mas->mas->max;
wr_mas->type = mte_node_type(wr_mas->mas->node);
if (mas_is_span_wr(wr_mas))
mas_reset(wr_mas->mas);
}
}
if (unlikely(mas_is_none(wr_mas->mas)))
goto reset;
/*
* A less strict version of mas_is_span_wr() where we allow spanning
* writes within this node. This is to stop partial walks in
* mas_prealloc() from being reset.
*/
if (wr_mas->mas->last > wr_mas->mas->max)
goto reset;
if (wr_mas->entry)
return;
if (mte_is_leaf(wr_mas->mas->node) &&
wr_mas->mas->last == wr_mas->mas->max)
goto reset;
return;
reset:
mas_reset(wr_mas->mas);
}
/* Interface */