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/*
* Copyright (C) 2019 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "src/trace_processor/importers/ftrace/rss_stat_tracker.h"
#include "src/trace_processor/importers/common/event_tracker.h"
#include "src/trace_processor/importers/common/process_tracker.h"
#include "src/trace_processor/types/trace_processor_context.h"
#include "protos/perfetto/trace/ftrace/kmem.pbzero.h"
namespace perfetto {
namespace trace_processor {
RssStatTracker::RssStatTracker(TraceProcessorContext* context)
: context_(context) {
rss_members_.emplace_back(context->storage->InternString("mem.rss.file"));
rss_members_.emplace_back(context->storage->InternString("mem.rss.anon"));
rss_members_.emplace_back(context->storage->InternString("mem.swap"));
rss_members_.emplace_back(context->storage->InternString("mem.rss.shmem"));
rss_members_.emplace_back(
context->storage->InternString("mem.rss.unknown")); // Keep this last.
}
void RssStatTracker::ParseRssStat(int64_t ts, uint32_t pid, ConstBytes blob) {
protos::pbzero::RssStatFtraceEvent::Decoder rss(blob.data, blob.size);
const auto kRssStatUnknown = static_cast<uint32_t>(rss_members_.size()) - 1;
auto member = static_cast<uint32_t>(rss.member());
int64_t size = rss.size();
if (member >= rss_members_.size()) {
context_->storage->IncrementStats(stats::rss_stat_unknown_keys);
member = kRssStatUnknown;
}
if (size < 0) {
context_->storage->IncrementStats(stats::rss_stat_negative_size);
return;
}
base::Optional<UniqueTid> utid;
if (rss.has_mm_id()) {
PERFETTO_DCHECK(rss.has_curr());
utid = FindUtidForMmId(rss.mm_id(), rss.curr(), pid);
} else {
utid = context_->process_tracker->GetOrCreateThread(pid);
}
if (utid) {
context_->event_tracker->PushProcessCounterForThread(
ts, size, rss_members_[member], *utid);
} else {
context_->storage->IncrementStats(stats::rss_stat_unknown_thread_for_mm_id);
}
}
base::Optional<UniqueTid> RssStatTracker::FindUtidForMmId(int64_t mm_id,
bool is_curr,
uint32_t pid) {
// If curr is true, we can just overwrite the state in the map and return
// the utid correspodning to |pid|.
if (is_curr) {
UniqueTid utid = context_->process_tracker->GetOrCreateThread(pid);
mm_id_to_utid_[mm_id] = utid;
return utid;
}
// If curr is false, try and lookup the utid we previously saw for this
// mm id.
auto it = mm_id_to_utid_.find(mm_id);
if (it == mm_id_to_utid_.end())
return base::nullopt;
// If the utid in the map is the same as our current utid but curr is false,
// that means we are in the middle of a process changing mm structs (i.e. in
// the middle of a vfork + exec). Therefore, we should discard the association
// of this vm struct with this thread.
UniqueTid utid = context_->process_tracker->GetOrCreateThread(pid);
if (it->second == utid) {
mm_id_to_utid_.erase(it);
return base::nullopt;
}
// Verify that the utid in the map is still alive. This can happen if an mm
// struct we saw in the past is about to be reused after thread but we don't
// know the new process that struct will be associated with.
if (!context_->process_tracker->IsThreadAlive(it->second)) {
mm_id_to_utid_.erase(it);
return base::nullopt;
}
// This case happens when a process is changing the VM of another process and
// we know that the utid corresponding to the target process. Just return that
// utid.
return it->second;
}
} // namespace trace_processor
} // namespace perfetto
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