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cgroup: Create UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP

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This is in preparation for creating unit_get_ancestor_memory_min.
This commit is contained in:
Chris Down 2019-04-16 18:14:09 +01:00
parent ac9b17271f
commit 6264b85e92
1 changed files with 29 additions and 24 deletions
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53
src/core/cgroup.c
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@ -384,32 +384,37 @@ int cgroup_add_device_allow(CGroupContext *c, const char *dev, const char *mode)
return 0;
}
uint64_t unit_get_ancestor_memory_low(Unit *u) {
CGroupContext *c;
/* 1. Is MemoryLow set in this unit? If so, use that.
* 2. Is DefaultMemoryLow set in any ancestor? If so, use that.
* 3. Otherwise, return CGROUP_LIMIT_MIN. */
assert(u);
c = unit_get_cgroup_context(u);
if (c->memory_low_set)
return c->memory_low;
while (UNIT_ISSET(u->slice)) {
u = UNIT_DEREF(u->slice);
c = unit_get_cgroup_context(u);
if (c->default_memory_low_set)
return c->default_memory_low;
}
/* We've reached the root, but nobody had DefaultMemoryLow set, so set it to the kernel default. */
return CGROUP_LIMIT_MIN;
#define UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(entry) \
uint64_t unit_get_ancestor_##entry(Unit *u) { \
CGroupContext *c; \
\
/* 1. Is entry set in this unit? If so, use that. \
* 2. Is the default for this entry set in any \
* ancestor? If so, use that. \
* 3. Otherwise, return CGROUP_LIMIT_MIN. */ \
\
assert(u); \
\
c = unit_get_cgroup_context(u); \
\
if (c->entry##_set) \
return c->entry; \
\
while (UNIT_ISSET(u->slice)) { \
u = UNIT_DEREF(u->slice); \
c = unit_get_cgroup_context(u); \
\
if (c->default_##entry##_set) \
return c->default_##entry; \
} \
\
/* We've reached the root, but nobody had default for \
* this entry set, so set it to the kernel default. */ \
return CGROUP_LIMIT_MIN; \
}
UNIT_DEFINE_ANCESTOR_MEMORY_LOOKUP(memory_low);
static void cgroup_xattr_apply(Unit *u) {
char ids[SD_ID128_STRING_MAX];
int r;