linux-kernel - [RFC 4/9] Popcorn system call additions

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Message-Id: <1d44b88fe4435a6ff0db629ac6883e6b01844019.1588127445.git.javier.malave@narfindustries.com>
Date:   Wed, 29 Apr 2020 15:32:51 -0400
From:   Javier Malave <javier.malave@...findustries.com>
To:     bx@...findustries.com
Cc:     Javier Malave <javier.malave@...findustries.com>,
        linux-kernel@...r.kernel.org, ah@...findustries.com
Subject: [RFC 4/9] Popcorn system call additions

The Popcorn system calls are a core component of
Popcorn Linux. All system calls have been added 
to kernel/sched/core.c

The main system call is popcorn_migrate. User
applications may invoke this system call to trigger
a migration from their origin node to a remote
node; and vice-versa. The system call relies on
several "server modules" (process server, vma server,
page server) to perform the migration and maintain
VMA coherency. A message layer for IPC has been
also added to communicate Popcorn messages across
the distributed threads. You may find a basic
example of the system call at the Popcorn kernel
library. All three system calls are showcased in the
Popcorn kernel library.
---
 arch/x86/entry/syscalls/syscall_64.tbl |  3 +++
 include/linux/syscalls.h               |  9 +++++++++
 include/uapi/asm-generic/unistd.h      | 11 +++++++++--
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/arch/x86/entry/syscalls/syscall_64.tbl b/arch/x86/entry/syscalls/syscall_64.tbl
index b4e6f9e62..5f8aff57e 100644
--- a/arch/x86/entry/syscalls/syscall_64.tbl
+++ b/arch/x86/entry/syscalls/syscall_64.tbl
@@ -355,6 +355,9 @@
 431	common	fsconfig		__x64_sys_fsconfig
 432	common	fsmount			__x64_sys_fsmount
 433	common	fspick			__x64_sys_fspick
+434	64	popcorn_migrate		__x64_sys_popcorn_migrate
+435	64	popcorn_get_thread_status	__x64_sys_popcorn_get_thread_status
+436	64	popcorn_get_node_info	__x64_sys_popcorn_get_node_info
 
 #
 # x32-specific system call numbers start at 512 to avoid cache impact
diff --git a/include/linux/syscalls.h b/include/linux/syscalls.h
index 2bcef4c70..e8e4430d5 100644
--- a/include/linux/syscalls.h
+++ b/include/linux/syscalls.h
@@ -1250,6 +1250,15 @@ ssize_t ksys_pread64(unsigned int fd, char __user *buf, size_t count,
 ssize_t ksys_pwrite64(unsigned int fd, const char __user *buf,
 		      size_t count, loff_t pos);
 int ksys_fallocate(int fd, int mode, loff_t offset, loff_t len);
+#ifdef CONFIG_POPCORN
+long ksys_brk(unsigned long brk);
+long ksys_mremap(unsigned long addr,
+		 unsigned long old_len, unsigned long new_len,
+		 unsigned long flags, unsigned long new_addr);
+long ksys_madvise(unsigned long start, size_t len, int behavior);
+long ksys_mprotect(unsigned long start, size_t len,
+		  unsigned long prot);
+#endif
 #ifdef CONFIG_ADVISE_SYSCALLS
 int ksys_fadvise64_64(int fd, loff_t offset, loff_t len, int advice);
 #else
diff --git a/include/uapi/asm-generic/unistd.h b/include/uapi/asm-generic/unistd.h
index a87904daf..71a526a1b 100644
--- a/include/uapi/asm-generic/unistd.h
+++ b/include/uapi/asm-generic/unistd.h
@@ -844,9 +844,16 @@ __SYSCALL(__NR_fsconfig, sys_fsconfig)
 __SYSCALL(__NR_fsmount, sys_fsmount)
 #define __NR_fspick 433
 __SYSCALL(__NR_fspick, sys_fspick)
-
+#ifdef CONFIG_POPCORN
+#define __NR_popcorn_migrate 434
+__SYSCALL(__NR_popcorn_migrate, sys_popcorn_migrate)
+#define __NR_popcorn_get_thread_status 435
+__SYSCALL(__NR_popcorn_get_thread_status, sys_popcorn_get_thread_status)
+#define __NR_popcorn_get_node_info 436
+__SYSCALL(__NR_popcorn_get_node_info, sys_popcorn_get_node_info)
+#endif
 #undef __NR_syscalls
-#define __NR_syscalls 434
+#define __NR_syscalls 437
 
 /*
  * 32 bit systems traditionally used different
-- 
2.17.1