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lmkd: Add support for cgroups v2 memcg hierarchy am: 759943643f am: 39cde77892 am: 3b00650675 

Original change: https://android-review.googlesource.com/c/platform/system/memory/lmkd/+/1972106

Change-Id: I4c3c64b0a93230d925d42c0e9bef5e0b05b50cd2
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
This commit is contained in:
Bart Van Assche 2022-04-19 18:35:38 +00:00 committed by Automerger Merge Worker
parent cbe6b65f72 3b00650675
commit 9b467fd0f9
1 changed files with 39 additions and 2 deletions
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41
lmkd.cpp
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@ -3154,14 +3154,44 @@ static void destroy_mp_psi(enum vmpressure_level level) {
mpevfd[level] = -1;
}
enum class MemcgVersion {
kNotFound,
kV1,
kV2,
};
static MemcgVersion __memcg_version() {
std::string cgroupv2_path, memcg_path;
if (!CgroupGetControllerPath("memory", &memcg_path)) {
return MemcgVersion::kNotFound;
}
return CgroupGetControllerPath(CGROUPV2_CONTROLLER_NAME, &cgroupv2_path) &&
cgroupv2_path == memcg_path
? MemcgVersion::kV2
: MemcgVersion::kV1;
}
static MemcgVersion memcg_version() {
static MemcgVersion version = __memcg_version();
return version;
}
static bool init_psi_monitors() {
/*
* When PSI is used on low-ram devices or on high-end devices without memfree levels
* use new kill strategy based on zone watermarks, free swap and thrashing stats
* use new kill strategy based on zone watermarks, free swap and thrashing stats.
* Also use the new strategy if memcg has not been mounted in the v1 cgroups hiearchy since
* the old strategy relies on memcg attributes that are available only in the v1 cgroups
* hiearchy.
*/
bool use_new_strategy =
GET_LMK_PROPERTY(bool, "use_new_strategy", low_ram_device || !use_minfree_levels);
if (!use_new_strategy && memcg_version() != MemcgVersion::kV1) {
ALOGE("Old kill strategy can only be used with v1 cgroup hierarchy");
return false;
}
/* In default PSI mode override stall amounts using system properties */
if (use_new_strategy) {
/* Do not use low pressure level */
@ -3186,6 +3216,13 @@ static bool init_psi_monitors() {
}
static bool init_mp_common(enum vmpressure_level level) {
// The implementation of this function relies on memcg statistics that are only available in the
// v1 cgroup hierarchy.
if (memcg_version() != MemcgVersion::kV1) {
ALOGE("%s: global monitoring is only available for the v1 cgroup hierarchy", __func__);
return false;
}
int mpfd;
int evfd;
int evctlfd;