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fix: add a check on online CPUs

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Signed-off-by: Andrea Terzolo <andrea.terzolo@polito.it>
This commit is contained in:
Andrea Terzolo
2023-05-24 17:39:56 +02:00
committed by poiana
parent 6713ace5c6
commit 1a359f5806
8 changed files with 109 additions and 10 deletions
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7
unit_tests/falco/app/actions/app_action_helpers.h Normal file
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@@ -0,0 +1,7 @@
#pragma once
#include <gtest/gtest.h>
#include <falco/app/state.h>
#include <falco/app/actions/actions.h>
#define EXPECT_ACTION_OK(r) { EXPECT_TRUE(r.success); EXPECT_TRUE(r.proceed); EXPECT_EQ(r.errstr, ""); }
#define EXPECT_ACTION_FAIL(r) { EXPECT_FALSE(r.success); EXPECT_FALSE(r.proceed); EXPECT_NE(r.errstr, ""); }

5
unit_tests/falco/app/actions/test_configure_interesting_sets.cpp
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@@ -18,10 +18,7 @@ limitations under the License.
#include <falco_engine.h>
#include <falco/app/app.h>
#include <falco/app/state.h>
#include <falco/app/actions/actions.h>
#include <gtest/gtest.h>
#include "app_action_helpers.h"
#define ASSERT_NAMES_EQ(a, b) { \
EXPECT_EQ(_order(a).size(), _order(b).size()); \

55
unit_tests/falco/app/actions/test_configure_syscall_buffer_num.cpp Normal file
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@@ -0,0 +1,55 @@
/*
Copyright (C) 2023 The Falco Authors.
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 ASSERTd 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 "app_action_helpers.h"
TEST(ActionConfigureSyscallBufferNum, variable_number_of_CPUs)
{
auto action = falco::app::actions::configure_syscall_buffer_num;
ssize_t online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if(online_cpus <= 0)
{
FAIL() << "cannot get the number of online CPUs from the system\n";
}
// not modern bpf engine, we do nothing
{
falco::app::state s;
s.options.modern_bpf = false;
EXPECT_ACTION_OK(action(s));
}
// modern bpf engine, with an invalid number of CPUs
// default `m_cpus_for_each_syscall_buffer` to online CPU number
{
falco::app::state s;
s.options.modern_bpf = true;
s.config->m_cpus_for_each_syscall_buffer = online_cpus + 1;
EXPECT_ACTION_OK(action(s));
EXPECT_EQ(s.config->m_cpus_for_each_syscall_buffer, online_cpus);
}
// modern bpf engine, with an valid number of CPUs
// we don't modify `m_cpus_for_each_syscall_buffer`
{
falco::app::state s;
s.options.modern_bpf = true;
s.config->m_cpus_for_each_syscall_buffer = online_cpus - 1;
EXPECT_ACTION_OK(action(s));
EXPECT_EQ(s.config->m_cpus_for_each_syscall_buffer, online_cpus - 1);
}
}

7
unit_tests/falco/app/actions/test_select_event_sources.cpp
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@@ -14,12 +14,7 @@ See the License for the specific language governing permissions and
limitations under the License.
*/
#include <gtest/gtest.h>
#include <falco/app/state.h>
#include <falco/app/actions/actions.h>
#define EXPECT_ACTION_OK(r) { EXPECT_TRUE(r.success); EXPECT_TRUE(r.proceed); EXPECT_EQ(r.errstr, ""); }
#define EXPECT_ACTION_FAIL(r) { EXPECT_FALSE(r.success); EXPECT_FALSE(r.proceed); EXPECT_NE(r.errstr, ""); }
#include "app_action_helpers.h"
TEST(ActionSelectEventSources, pre_post_conditions)
{

1
userspace/falco/CMakeLists.txt
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@@ -42,6 +42,7 @@ set(
app/actions/print_version.cpp
app/actions/print_page_size.cpp
app/actions/compute_syscall_buffer_size.cpp
app/actions/configure_syscall_buffer_num.cpp
app/actions/select_event_sources.cpp
app/actions/start_grpc_server.cpp
app/actions/start_webserver.cpp

1
userspace/falco/app/actions/actions.h
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@@ -25,6 +25,7 @@ namespace actions {
falco::app::run_result configure_interesting_sets(falco::app::state& s);
falco::app::run_result configure_syscall_buffer_size(falco::app::state& s);
falco::app::run_result configure_syscall_buffer_num(falco::app::state& s);
falco::app::run_result create_requested_paths(falco::app::state& s);
falco::app::run_result create_signal_handlers(falco::app::state& s);
falco::app::run_result daemonize(falco::app::state& s);

42
userspace/falco/app/actions/configure_syscall_buffer_num.cpp Normal file
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@@ -0,0 +1,42 @@
/*
Copyright (C) 2023 The Falco Authors.
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 "actions.h"
using namespace falco::app;
using namespace falco::app::actions;
falco::app::run_result falco::app::actions::configure_syscall_buffer_num(falco::app::state& s)
{
if(!s.options.modern_bpf)
{
return run_result::ok();
}
ssize_t online_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if(online_cpus <= 0)
{
return run_result::fatal("cannot get the number of online CPUs from the system\n");
}
if(s.config->m_cpus_for_each_syscall_buffer > online_cpus)
{
falco_logger::log(LOG_WARNING, "you required a buffer every '" + std::to_string(s.config->m_cpus_for_each_syscall_buffer) + "' CPUs but there are only '" + std::to_string(online_cpus) + "' online CPUs. Falco changed the config to: one buffer every '" + std::to_string(online_cpus) + "' CPUs\n");
s.config->m_cpus_for_each_syscall_buffer = online_cpus;
}
return run_result::ok();
}

1
userspace/falco/app/app.cpp
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@@ -84,6 +84,7 @@ bool falco::app::run(falco::app::state& s, bool& restart, std::string& errstr)
falco::app::actions::init_clients,
falco::app::actions::configure_interesting_sets,
falco::app::actions::configure_syscall_buffer_size,
falco::app::actions::configure_syscall_buffer_num,
falco::app::actions::start_grpc_server,
falco::app::actions::start_webserver,
falco::app::actions::process_events,