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Hui, Chunyang 6dd73c64b5 Improve userspace VM management 
Occlum is a single-address-space library OS. Previously, userspace memory are divided for each process.
And all the memory are allocated when the process is created, which leads to a lot of wasted space and
complicated configuration.

In the current implementation, the whole userspace is managed as a memory pool that consists of chunks. There
are two kinds of chunks:
(1) Single VMA chunk: a chunk with only one VMA. Should be owned by exactly one process.
(2) Multi VMA chunk: a chunk with default chunk size and there could be a lot of VMAs in this chunk. Can be used
by different processes.

This design can help to achieve mainly two goals:
(1) Simplify the configuration: Users don't need to configure the process.default_mmap_size anymore. And multiple processes
running in the same Occlum instance can use dramatically different sizes of memory.
(2) Gain better performance: Two-level management(chunks & VMAs) reduces the time for finding, inserting, deleting, and iterating.
2021-10-17 15:58:29 +08:00
..
access Add "*at()" system calls 2020-09-18 12:39:12 +08:00
chmod Add "*at()" system calls 2020-09-18 12:39:12 +08:00
chown Add Glibc as an optional libc and fix test cases 2020-12-16 19:21:22 +08:00
client Fix the compiler's warnings in make test with glibc 2021-08-04 12:00:31 +08:00
cout Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
cpuid Fix the cpuid test case issue 2021-09-09 14:09:03 +08:00
data_sink Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
device Fix the compiler's warnings in make test with glibc 2021-08-04 12:00:31 +08:00
empty Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
emulate_syscall Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
env Add file POSIX advisory range lock 2021-09-15 11:15:42 +08:00
eventfd Fix the compiler's warnings in make test with glibc 2021-08-04 12:00:31 +08:00
exec Fix the compiler's warnings in make test with glibc 2021-08-04 12:00:31 +08:00
exit_group Disable busyloop test case due to signal handling constraints in SIM mode 2021-06-25 21:12:42 +08:00
fcntl Add file POSIX advisory range lock 2021-09-15 11:15:42 +08:00
file Add support for the mode of fallocate 2021-09-01 19:24:22 +08:00
flock Add file POSIX advisory range lock 2021-09-15 11:15:42 +08:00
fs_perms Add O_TRUNC support in open syscall and rewrite the truncate test 2021-06-04 11:47:38 +08:00
getpid Add process group implementation and support set/getpgid, set/getpgrp 2021-08-20 08:34:44 +08:00
hello_world Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
hostfs Add O_TRUNC support in open syscall and rewrite the truncate test 2021-06-04 11:47:38 +08:00
include Add support for the mode of fallocate 2021-09-01 19:24:22 +08:00
ioctl Test DCAP ioctl only on SGX2 HW 2021-09-09 14:09:03 +08:00
link Add Glibc as an optional libc and fix test cases 2020-12-16 19:21:22 +08:00
malloc Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
mkdir Fix the wrong value returned from getcwd 2021-07-27 13:05:35 +08:00
mmap Improve userspace VM management 2021-10-17 15:58:29 +08:00
naughty_child Add vfork support 2021-08-24 11:24:03 +08:00
open Add creat syscall 2021-08-06 10:40:44 +08:00
pgrp Add process group implementation and support set/getpgid, set/getpgrp 2021-08-20 08:34:44 +08:00
pipe Add support for ioctl FIONREAD, FIOCLEX, FIONCLEX for pipe and uds file 2021-06-07 08:28:51 +08:00
pipe_throughput Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
prctl Add Glibc as an optional libc and fix test cases 2020-12-16 19:21:22 +08:00
procfs Add support for '/proc/[pid]/stat' 2021-08-05 16:10:54 +08:00
pthread Add support for robust futex syscalls 2021-07-30 10:25:24 +08:00
random Add getrandom syscall 2021-09-06 19:20:51 +08:00
rdtsc Fix the emulation of RDTSC instruction with ocall 2020-03-24 22:06:14 +08:00
readdir Add getdents support for procfs's inode 2021-08-03 20:40:07 +08:00
rename Add "*at()" system calls 2020-09-18 12:39:12 +08:00
resolv_conf Fix the compiler's warnings in make test with glibc 2021-08-04 12:00:31 +08:00
rlimit Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
sched Fix the sched test when available cpu is less than online cpu 2021-01-20 16:00:33 +08:00
server Fix the compiler's warnings in make test with glibc 2021-08-04 12:00:31 +08:00
server_epoll Workaround the server and server_epoll test case 2021-03-03 16:07:51 +08:00
signal Enable exception test cases under simulation mode 2021-03-03 16:07:51 +08:00
sleep Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
spawn Add vfork support 2021-08-24 11:24:03 +08:00
spawn_and_exit_latency Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
spawn_attribute Add support for POSIX_SPAWN_SETSIGMASK and POSIX_SPAWN_SETSIGDEF 2021-06-01 20:34:51 +08:00
stat Add Glibc as an optional libc and fix test cases 2020-12-16 19:21:22 +08:00
statfs Add statfs and fstatfs syscall 2021-06-04 11:36:47 +08:00
symlink Add ProcFS 2021-01-20 12:42:00 +08:00
sysinfo Fix sysinfo test false alarm on uptime 2021-02-04 17:48:43 +08:00
system_info Add getgroups syscall 2021-06-10 20:14:37 +08:00
time Add time syscall and default localtime support 2021-03-26 16:56:57 +08:00
timerfd Support timerfd-related syscall 2021-07-16 14:36:27 +08:00
tls Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
truncate Add O_TRUNC support in open syscall and rewrite the truncate test 2021-06-04 11:47:38 +08:00
umask Add support for umask 2021-08-09 16:50:53 +08:00
unix_socket Fix the compiler's warnings in make test with glibc 2021-08-04 12:00:31 +08:00
unix_socket_throughput Format c/c++ files in src, tools and test 2020-05-27 07:09:18 +00:00
vfork Add vfork support 2021-08-24 11:24:03 +08:00
wait Add support for WNOHANG of waitpid option 2021-05-10 10:11:24 +08:00
Makefile Add stress test capabilites for make test 2021-10-15 11:52:53 +08:00
Occlum.json Fix aliyunlinux test 2021-10-01 08:29:25 +08:00
test_common.mk Add Glibc as an optional libc and fix test cases 2020-12-16 19:21:22 +08:00