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libsolv/SOURCES/0003-Improve-choice-rule-generation.patch
CentOS Sources 3928071d27 import libsolv-0.7.20-3.el8
2022-11-08 13:31:02 +00:00

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From fd52342713012ec111b1559fa1647f88768fa782 Mon Sep 17 00:00:00 2001
From: Michael Schroeder <mls@suse.de>
Date: Wed, 16 Mar 2022 15:17:20 +0100
Subject: [PATCH 3/3] Improve choice rule generation
New strategy: take the package update map into account when creating
choice rules. This simplifies the code quite a bit. Also check at
the end of the solving if a choice rule led to two packages providing
the same thing. In that case, break the choice rule and re-run the
solver.
---
src/rules.c | 169 +++++++++++++--------------------------------------
src/solver.c | 45 ++++++++++++++
2 files changed, 88 insertions(+), 126 deletions(-)
diff --git a/src/rules.c b/src/rules.c
index 212df322..324fe5da 100644
--- a/src/rules.c
+++ b/src/rules.c
@@ -3139,6 +3139,12 @@ solver_rule2rules(Solver *solv, Id rid, Queue *q, int recursive)
/* check if the newest versions of pi still provides the dependency we're looking for */
+/* pi: installed package
+ * r: rule for the dependency
+ * m: map with all positive elements of r
+ * return 0: at least one provider
+ * return 1: the newest versions do not provide the dependency
+ */
static int
solver_choicerulecheck(Solver *solv, Id pi, Rule *r, Map *m, Queue *q)
{
@@ -3187,94 +3193,6 @@ solver_choicerulecheck(Solver *solv, Id pi, Rule *r, Map *m, Queue *q)
return 1; /* none of the new packages provided it */
}
-static int
-solver_choicerulecheck2(Solver *solv, Id pi, Id pt, Queue *q)
-{
- Pool *pool = solv->pool;
- Rule *ur;
- Id p, pp;
- int i;
-
- if (!q->count || q->elements[0] != pi)
- {
- if (q->count)
- queue_empty(q);
- ur = solv->rules + solv->updaterules + (pi - pool->installed->start);
- if (!ur->p)
- ur = solv->rules + solv->featurerules + (pi - pool->installed->start);
- if (!ur->p)
- return 1; /* orphaned, thus newest */
- queue_push2(q, pi, 0);
- FOR_RULELITERALS(p, pp, ur)
- if (p > 0 && p != pi)
- queue_push(q, p);
- queue_push(q, pi);
- }
- if (q->count <= 3)
- return q->count == 3 && q->elements[2] == pt ? 1 : 0;
- if (!q->elements[1])
- {
- queue_deleten(q, 0, 2);
- policy_filter_unwanted(solv, q, POLICY_MODE_CHOOSE);
- queue_unshift(q, 1); /* filter mark */
- queue_unshift(q, pi);
- }
- for (i = 2; i < q->count; i++)
- if (q->elements[i] == pt)
- return 1;
- return 0; /* not newest */
-}
-
-static int
-solver_choicerulecheck3(Solver *solv, Id pt, Queue *q)
-{
- Pool *pool = solv->pool;
- Id p, pp;
- int i;
-
- if (!q->count || q->elements[0] != pt)
- {
- Solvable *s = pool->solvables + pt;
- if (q->count)
- queue_empty(q);
- /* no installed package, so check all with same name */
- queue_push2(q, pt, 0);
- FOR_PROVIDES(p, pp, s->name)
- if (pool->solvables[p].name == s->name && p != pt)
- queue_push(q, p);
- queue_push(q, pt);
- }
- if (q->count <= 3)
- return q->count == 3 && q->elements[2] == pt ? 1 : 0;
- if (!q->elements[1])
- {
- queue_deleten(q, 0, 2);
- policy_filter_unwanted(solv, q, POLICY_MODE_CHOOSE);
- queue_unshift(q, 1); /* filter mark */
- queue_unshift(q, pt);
- }
- for (i = 2; i < q->count; i++)
- if (q->elements[i] == pt)
- return 1;
- return 0; /* not newest */
-}
-
-static inline void
-queue_removeelement(Queue *q, Id el)
-{
- int i, j;
- for (i = 0; i < q->count; i++)
- if (q->elements[i] == el)
- break;
- if (i < q->count)
- {
- for (j = i++; i < q->count; i++)
- if (q->elements[i] != el)
- q->elements[j++] = q->elements[i];
- queue_truncate(q, j);
- }
-}
-
static Id
choicerule_find_installed(Pool *pool, Id p)
{
@@ -3323,14 +3241,14 @@ solver_addchoicerules(Solver *solv)
Pool *pool = solv->pool;
Map m, mneg;
Rule *r;
- Queue q, qi, qcheck, qcheck2, infoq;
+ Queue q, qi, qcheck, infoq;
int i, j, rid, havechoice, negcnt;
Id p, d, pp, p2;
Solvable *s;
Id lastaddedp, lastaddedd;
int lastaddedcnt;
unsigned int now;
- int isnewest = 0;
+ int isinstalled;
solv->choicerules = solv->nrules;
if (!pool->installed)
@@ -3342,7 +3260,6 @@ solver_addchoicerules(Solver *solv)
queue_init(&q);
queue_init(&qi);
queue_init(&qcheck);
- queue_init(&qcheck2);
queue_init(&infoq);
map_init(&m, pool->nsolvables);
map_init(&mneg, pool->nsolvables);
@@ -3362,20 +3279,28 @@ solver_addchoicerules(Solver *solv)
if (r->p >= 0 || ((r->d == 0 || r->d == -1) && r->w2 <= 0))
continue; /* only look at requires rules */
/* solver_printrule(solv, SOLV_DEBUG_RESULT, r); */
- queue_empty(&q);
queue_empty(&qi);
havechoice = 0;
+ isinstalled = 0;
FOR_RULELITERALS(p, pp, r)
{
if (p < 0)
- continue;
+ {
+ Solvable *s = pool->solvables - p;
+ p2 = s->repo == pool->installed ? -p : 0;
+ if (p2)
+ {
+ if (!(solv->updatemap_all || (solv->updatemap.size && MAPTST(&solv->updatemap, p2 - solv->installed->start))))
+ isinstalled = 1;
+ }
+ continue;
+ }
s = pool->solvables + p;
if (!s->repo)
continue;
if (s->repo == pool->installed)
{
queue_push2(&qi, p, p);
- queue_push(&q, p);
continue;
}
/* find an installed package p2 that we can update/downgrade to p */
@@ -3387,7 +3312,6 @@ solver_addchoicerules(Solver *solv)
if (policy_is_illegal(solv, pool->solvables + p2, s, 0))
continue;
queue_push2(&qi, p2, p);
- queue_push(&q, p);
continue;
}
/* package p is independent of the installed ones */
@@ -3396,47 +3320,31 @@ solver_addchoicerules(Solver *solv)
#if 0
printf("havechoice: %d qcount %d qicount %d\n", havechoice, q.count, qi.count);
#endif
- if (!havechoice || !q.count || !qi.count)
+ if (!havechoice || !qi.count)
continue; /* no choice */
FOR_RULELITERALS(p, pp, r)
if (p > 0)
MAPSET(&m, p);
- isnewest = 1;
- FOR_RULELITERALS(p, pp, r)
- {
- if (p > 0)
- break;
- p2 = choicerule_find_installed(pool, -p);
- if (p2 && !solver_choicerulecheck2(solv, p2, -p, &qcheck2))
- {
- isnewest = 0;
- break;
- }
- if (!p2 && !solver_choicerulecheck3(solv, -p, &qcheck2))
- {
- isnewest = 0;
- break;
- }
- }
- /* do extra checking */
- for (i = j = 0; i < qi.count; i += 2)
+ if (!isinstalled)
{
- p2 = qi.elements[i];
- if (!p2)
- continue;
- if (isnewest && solver_choicerulecheck(solv, p2, r, &m, &qcheck))
+ /* do extra checking for packages related to installed packages */
+ for (i = j = 0; i < qi.count; i += 2)
{
- /* oops, remove element p from q */
- queue_removeelement(&q, qi.elements[i + 1]);
- continue;
+ p2 = qi.elements[i];
+ if (solv->updatemap_all || (solv->updatemap.size && MAPTST(&solv->updatemap, p2 - solv->installed->start)))
+ {
+ if (solver_choicerulecheck(solv, p2, r, &m, &qcheck))
+ continue;
+ }
+ qi.elements[j++] = p2;
+ qi.elements[j++] = qi.elements[i + 1];
}
- qi.elements[j++] = p2;
+ queue_truncate(&qi, j);
}
- queue_truncate(&qi, j);
- if (!q.count || !qi.count)
+ if (!qi.count)
{
FOR_RULELITERALS(p, pp, r)
if (p > 0)
@@ -3444,6 +3352,15 @@ solver_addchoicerules(Solver *solv)
continue;
}
+ queue_empty(&q);
+ /* split q from qi */
+ for (i = j = 0; i < qi.count; i += 2)
+ {
+ queue_push(&q, qi.elements[i + 1]);
+ qi.elements[j++] = qi.elements[i];
+ }
+ queue_truncate(&qi, j);
+
/* now check the update rules of the installed package.
* if all packages of the update rules are contained in
@@ -3463,6 +3380,7 @@ solver_addchoicerules(Solver *solv)
break;
if (p)
break;
+ /* speed improvement: only check each package once */
for (j = i + 1; j < qi.count; j++)
if (qi.elements[i] == qi.elements[j])
qi.elements[j] = 0;
@@ -3520,7 +3438,6 @@ solver_addchoicerules(Solver *solv)
queue_free(&q);
queue_free(&qi);
queue_free(&qcheck);
- queue_free(&qcheck2);
queue_free(&infoq);
map_free(&m);
map_free(&mneg);
diff --git a/src/solver.c b/src/solver.c
index 1dc2c783..08029baa 100644
--- a/src/solver.c
+++ b/src/solver.c
@@ -2615,6 +2615,43 @@ resolve_orphaned(Solver *solv, int level, int disablerules, Queue *dq, int *reru
return level;
}
+int
+solver_check_unneeded_choicerules(Solver *solv)
+{
+ Pool *pool = solv->pool;
+ Rule *r, *or;
+ Id p, pp, p2, pp2;
+ int i;
+ int havedisabled = 0;
+
+ /* check if some choice rules could have been broken */
+ for (i = solv->choicerules, r = solv->rules + i; i < solv->choicerules_end; i++, r++)
+ {
+ if (r->d < 0)
+ continue;
+ or = solv->rules + solv->choicerules_info[i - solv->choicerules];
+ if (or->d < 0)
+ continue;
+ FOR_RULELITERALS(p, pp, or)
+ {
+ if (p < 0 || solv->decisionmap[p] <= 0)
+ continue;
+ FOR_RULELITERALS(p2, pp2, r)
+ if (p2 == p)
+ break;
+ if (!p2)
+ {
+ /* did not find p in choice rule, disable it */
+ POOL_DEBUG(SOLV_DEBUG_SOLVER, "disabling unneeded choice rule #%d\n", i);
+ solver_disablechoicerules(solv, r);
+ havedisabled = 1;
+ break;
+ }
+ }
+ }
+ return havedisabled;
+}
+
/*-------------------------------------------------------------------
*
* solver_run_sat
@@ -2800,6 +2837,14 @@ solver_run_sat(Solver *solv, int disablerules, int doweak)
continue;
}
+ if (solv->choicerules != solv->choicerules_end && solver_check_unneeded_choicerules(solv))
+ {
+ POOL_DEBUG(SOLV_DEBUG_SOLVER, "did choice rule minimization, rerunning solver\n");
+ solver_reset(solv);
+ level = 0; /* restart from scratch */
+ continue;
+ }
+
if (solv->solution_callback)
{
solv->solution_callback(solv, solv->solution_callback_data);
--
2.31.1
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