140 lines
4.3 KiB
Diff
140 lines
4.3 KiB
Diff
From 5c5128094c75a184e54e82f2ad43c67423184c3e Mon Sep 17 00:00:00 2001
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From: Phil Sutter <psutter@redhat.com>
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Date: Fri, 24 Jun 2022 16:02:59 +0200
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Subject: [PATCH] intervals: Do not sort cached set elements over and over
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again
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=2211076
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Upstream Status: nftables commit 59e3a59221fb8
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commit 59e3a59221fb81c289a0868a85140dd452fb1c30
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Author: Phil Sutter <phil@nwl.cc>
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Date: Thu Jun 16 10:56:12 2022 +0200
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intervals: Do not sort cached set elements over and over again
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When adding element(s) to a non-empty set, code merged the two lists and
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sorted the result. With many individual 'add element' commands this
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causes substantial overhead. Make use of the fact that
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existing_set->init is sorted already, sort only the list of new elements
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and use list_splice_sorted() to merge the two sorted lists.
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Add set_sort_splice() and use it for set element overlap detection and
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automerge.
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A test case adding ~25k elements in individual commands completes in
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about 1/4th of the time with this patch applied.
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Joint work with Pablo.
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Fixes: 3da9643fb9ff9 ("intervals: add support to automerge with kernel elements")
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Signed-off-by: Phil Sutter <phil@nwl.cc>
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Signed-off-by: Pablo Neira Ayuso <pablo@netfilter.org>
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Signed-off-by: Phil Sutter <psutter@redhat.com>
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---
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include/expression.h | 1 +
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src/intervals.c | 46 +++++++++++++++++++++-----------------------
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src/mergesort.c | 2 +-
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3 files changed, 24 insertions(+), 25 deletions(-)
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diff --git a/include/expression.h b/include/expression.h
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index 53194c9..cf7319b 100644
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--- a/include/expression.h
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+++ b/include/expression.h
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@@ -481,6 +481,7 @@ extern struct expr *compound_expr_alloc(const struct location *loc,
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extern void compound_expr_add(struct expr *compound, struct expr *expr);
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extern void compound_expr_remove(struct expr *compound, struct expr *expr);
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extern void list_expr_sort(struct list_head *head);
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+extern void list_splice_sorted(struct list_head *list, struct list_head *head);
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extern struct expr *concat_expr_alloc(const struct location *loc);
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diff --git a/src/intervals.c b/src/intervals.c
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index e203413..dcc06d1 100644
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--- a/src/intervals.c
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+++ b/src/intervals.c
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@@ -118,6 +118,26 @@ static bool merge_ranges(struct set_automerge_ctx *ctx,
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return false;
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}
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+static void set_sort_splice(struct expr *init, struct set *set)
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+{
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+ struct set *existing_set = set->existing_set;
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+
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+ set_to_range(init);
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+ list_expr_sort(&init->expressions);
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+
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+ if (!existing_set)
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+ return;
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+
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+ if (existing_set->init) {
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+ set_to_range(existing_set->init);
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+ list_splice_sorted(&existing_set->init->expressions,
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+ &init->expressions);
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+ init_list_head(&existing_set->init->expressions);
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+ } else {
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+ existing_set->init = set_expr_alloc(&internal_location, set);
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+ }
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+}
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+
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static void setelem_automerge(struct set_automerge_ctx *ctx)
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{
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struct expr *i, *next, *prev = NULL;
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@@ -222,18 +242,7 @@ int set_automerge(struct list_head *msgs, struct cmd *cmd, struct set *set,
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return 0;
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}
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- if (existing_set) {
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- if (existing_set->init) {
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- list_splice_init(&existing_set->init->expressions,
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- &init->expressions);
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- } else {
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- existing_set->init = set_expr_alloc(&internal_location,
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- set);
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- }
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- }
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-
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- set_to_range(init);
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- list_expr_sort(&init->expressions);
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+ set_sort_splice(init, set);
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ctx.purge = set_expr_alloc(&internal_location, set);
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@@ -591,18 +600,7 @@ int set_overlap(struct list_head *msgs, struct set *set, struct expr *init)
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struct expr *i, *n, *clone;
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int err;
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- if (existing_set) {
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- if (existing_set->init) {
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- list_splice_init(&existing_set->init->expressions,
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- &init->expressions);
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- } else {
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- existing_set->init = set_expr_alloc(&internal_location,
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- set);
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- }
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- }
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-
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- set_to_range(init);
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- list_expr_sort(&init->expressions);
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+ set_sort_splice(init, set);
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err = setelem_overlap(msgs, set, init);
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diff --git a/src/mergesort.c b/src/mergesort.c
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index 8e6aac5..dca7142 100644
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--- a/src/mergesort.c
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+++ b/src/mergesort.c
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@@ -70,7 +70,7 @@ static int expr_msort_cmp(const struct expr *e1, const struct expr *e2)
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return ret;
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}
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-static void list_splice_sorted(struct list_head *list, struct list_head *head)
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+void list_splice_sorted(struct list_head *list, struct list_head *head)
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{
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struct list_head *h = head->next;
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struct list_head *l = list->next;
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--
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2.41.0.rc1
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