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linux/arch/powerpc/kernel/syscalls/syscall.tbl
Minchan Kim ecb8ac8b1f mm/madvise: introduce process_madvise() syscall: an external memory hinting API 
There is usecase that System Management Software(SMS) want to give a
memory hint like MADV_[COLD|PAGEEOUT] to other processes and in the
case of Android, it is the ActivityManagerService.

The information required to make the reclaim decision is not known to the
app.  Instead, it is known to the centralized userspace
daemon(ActivityManagerService), and that daemon must be able to initiate
reclaim on its own without any app involvement.

To solve the issue, this patch introduces a new syscall
process_madvise(2).  It uses pidfd of an external process to give the
hint.  It also supports vector address range because Android app has
thousands of vmas due to zygote so it's totally waste of CPU and power if
we should call the syscall one by one for each vma.(With testing 2000-vma
syscall vs 1-vector syscall, it showed 15% performance improvement.  I
think it would be bigger in real practice because the testing ran very
cache friendly environment).

Another potential use case for the vector range is to amortize the cost
ofTLB shootdowns for multiple ranges when using MADV_DONTNEED; this could
benefit users like TCP receive zerocopy and malloc implementations.  In
future, we could find more usecases for other advises so let's make it
happens as API since we introduce a new syscall at this moment.  With
that, existing madvise(2) user could replace it with process_madvise(2)
with their own pid if they want to have batch address ranges support
feature.

ince it could affect other process's address range, only privileged
process(PTRACE_MODE_ATTACH_FSCREDS) or something else(e.g., being the same
UID) gives it the right to ptrace the process could use it successfully.
The flag argument is reserved for future use if we need to extend the API.

I think supporting all hints madvise has/will supported/support to
process_madvise is rather risky.  Because we are not sure all hints make
sense from external process and implementation for the hint may rely on
the caller being in the current context so it could be error-prone.  Thus,
I just limited hints as MADV_[COLD|PAGEOUT] in this patch.

If someone want to add other hints, we could hear the usecase and review
it for each hint.  It's safer for maintenance rather than introducing a
buggy syscall but hard to fix it later.

So finally, the API is as follows,

      ssize_t process_madvise(int pidfd, const struct iovec *iovec,
                unsigned long vlen, int advice, unsigned int flags);

    DESCRIPTION
      The process_madvise() system call is used to give advice or directions
      to the kernel about the address ranges from external process as well as
      local process. It provides the advice to address ranges of process
      described by iovec and vlen. The goal of such advice is to improve
      system or application performance.

      The pidfd selects the process referred to by the PID file descriptor
      specified in pidfd. (See pidofd_open(2) for further information)

      The pointer iovec points to an array of iovec structures, defined in
      <sys/uio.h> as:

        struct iovec {
            void *iov_base;         /* starting address */
            size_t iov_len;         /* number of bytes to be advised */
        };

      The iovec describes address ranges beginning at address(iov_base)
      and with size length of bytes(iov_len).

      The vlen represents the number of elements in iovec.

      The advice is indicated in the advice argument, which is one of the
      following at this moment if the target process specified by pidfd is
      external.

        MADV_COLD
        MADV_PAGEOUT

      Permission to provide a hint to external process is governed by a
      ptrace access mode PTRACE_MODE_ATTACH_FSCREDS check; see ptrace(2).

      The process_madvise supports every advice madvise(2) has if target
      process is in same thread group with calling process so user could
      use process_madvise(2) to extend existing madvise(2) to support
      vector address ranges.

    RETURN VALUE
      On success, process_madvise() returns the number of bytes advised.
      This return value may be less than the total number of requested
      bytes, if an error occurred. The caller should check return value
      to determine whether a partial advice occurred.

FAQ:

Q.1 - Why does any external entity have better knowledge?

Quote from Sandeep

"For Android, every application (including the special SystemServer)
are forked from Zygote.  The reason of course is to share as many
libraries and classes between the two as possible to benefit from the
preloading during boot.

After applications start, (almost) all of the APIs end up calling into
this SystemServer process over IPC (binder) and back to the
application.

In a fully running system, the SystemServer monitors every single
process periodically to calculate their PSS / RSS and also decides
which process is "important" to the user for interactivity.

So, because of how these processes start _and_ the fact that the
SystemServer is looping to monitor each process, it does tend to *know*
which address range of the application is not used / useful.

Besides, we can never rely on applications to clean things up
themselves.  We've had the "hey app1, the system is low on memory,
please trim your memory usage down" notifications for a long time[1].
They rely on applications honoring the broadcasts and very few do.

So, if we want to avoid the inevitable killing of the application and
restarting it, some way to be able to tell the OS about unimportant
memory in these applications will be useful.

- ssp

Q.2 - How to guarantee the race(i.e., object validation) between when
giving a hint from an external process and get the hint from the target
process?

process_madvise operates on the target process's address space as it
exists at the instant that process_madvise is called.  If the space
target process can run between the time the process_madvise process
inspects the target process address space and the time that
process_madvise is actually called, process_madvise may operate on
memory regions that the calling process does not expect.  It's the
responsibility of the process calling process_madvise to close this
race condition.  For example, the calling process can suspend the
target process with ptrace, SIGSTOP, or the freezer cgroup so that it
doesn't have an opportunity to change its own address space before
process_madvise is called.  Another option is to operate on memory
regions that the caller knows a priori will be unchanged in the target
process.  Yet another option is to accept the race for certain
process_madvise calls after reasoning that mistargeting will do no
harm.  The suggested API itself does not provide synchronization.  It
also apply other APIs like move_pages, process_vm_write.

The race isn't really a problem though.  Why is it so wrong to require
that callers do their own synchronization in some manner?  Nobody
objects to write(2) merely because it's possible for two processes to
open the same file and clobber each other's writes --- instead, we tell
people to use flock or something.  Think about mmap.  It never
guarantees newly allocated address space is still valid when the user
tries to access it because other threads could unmap the memory right
before.  That's where we need synchronization by using other API or
design from userside.  It shouldn't be part of API itself.  If someone
needs more fine-grained synchronization rather than process level,
there were two ideas suggested - cookie[2] and anon-fd[3].  Both are
applicable via using last reserved argument of the API but I don't
think it's necessary right now since we have already ways to prevent
the race so don't want to add additional complexity with more
fine-grained optimization model.

To make the API extend, it reserved an unsigned long as last argument
so we could support it in future if someone really needs it.

Q.3 - Why doesn't ptrace work?

Injecting an madvise in the target process using ptrace would not work
for us because such injected madvise would have to be executed by the
target process, which means that process would have to be runnable and
that creates the risk of the abovementioned race and hinting a wrong
VMA.  Furthermore, we want to act the hint in caller's context, not the
callee's, because the callee is usually limited in cpuset/cgroups or
even freezed state so they can't act by themselves quick enough, which
causes more thrashing/kill.  It doesn't work if the target process are
ptraced(e.g., strace, debugger, minidump) because a process can have at
most one ptracer.

[1] https://developer.android.com/topic/performance/memory"

[2] process_getinfo for getting the cookie which is updated whenever
    vma of process address layout are changed - Daniel Colascione -
    https://lore.kernel.org/lkml/20190520035254.57579-1-minchan@kernel.org/T/#m7694416fd179b2066a2c62b5b139b14e3894e224

[3] anonymous fd which is used for the object(i.e., address range)
    validation - Michal Hocko -
    https://lore.kernel.org/lkml/20200120112722.GY18451@dhcp22.suse.cz/

[minchan@kernel.org: fix process_madvise build break for arm64]
  Link: http://lkml.kernel.org/r/20200303145756.GA219683@google.com
[minchan@kernel.org: fix build error for mips of process_madvise]
  Link: http://lkml.kernel.org/r/20200508052517.GA197378@google.com
[akpm@linux-foundation.org: fix patch ordering issue]
[akpm@linux-foundation.org: fix arm64 whoops]
[minchan@kernel.org: make process_madvise() vlen arg have type size_t, per Florian]
[akpm@linux-foundation.org: fix i386 build]
[sfr@canb.auug.org.au: fix syscall numbering]
  Link: https://lkml.kernel.org/r/20200905142639.49fc3f1a@canb.auug.org.au
[sfr@canb.auug.org.au: madvise.c needs compat.h]
  Link: https://lkml.kernel.org/r/20200908204547.285646b4@canb.auug.org.au
[minchan@kernel.org: fix mips build]
  Link: https://lkml.kernel.org/r/20200909173655.GC2435453@google.com
[yuehaibing@huawei.com: remove duplicate header which is included twice]
  Link: https://lkml.kernel.org/r/20200915121550.30584-1-yuehaibing@huawei.com
[minchan@kernel.org: do not use helper functions for process_madvise]
  Link: https://lkml.kernel.org/r/20200921175539.GB387368@google.com
[akpm@linux-foundation.org: pidfd_get_pid() gained an argument]
[sfr@canb.auug.org.au: fix up for "iov_iter: transparently handle compat iovecs in import_iovec"]
  Link: https://lkml.kernel.org/r/20200928212542.468e1fef@canb.auug.org.au

Signed-off-by: Minchan Kim <minchan@kernel.org>
Signed-off-by: YueHaibing <yuehaibing@huawei.com>
Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Reviewed-by: Vlastimil Babka <vbabka@suse.cz>
Acked-by: David Rientjes <rientjes@google.com>
Cc: Alexander Duyck <alexander.h.duyck@linux.intel.com>
Cc: Brian Geffon <bgeffon@google.com>
Cc: Christian Brauner <christian@brauner.io>
Cc: Daniel Colascione <dancol@google.com>
Cc: Jann Horn <jannh@google.com>
Cc: Jens Axboe <axboe@kernel.dk>
Cc: Joel Fernandes <joel@joelfernandes.org>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: John Dias <joaodias@google.com>
Cc: Kirill Tkhai <ktkhai@virtuozzo.com>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Oleksandr Natalenko <oleksandr@redhat.com>
Cc: Sandeep Patil <sspatil@google.com>
Cc: SeongJae Park <sj38.park@gmail.com>
Cc: SeongJae Park <sjpark@amazon.de>
Cc: Shakeel Butt <shakeelb@google.com>
Cc: Sonny Rao <sonnyrao@google.com>
Cc: Tim Murray <timmurray@google.com>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: Florian Weimer <fw@deneb.enyo.de>
Cc: <linux-man@vger.kernel.org>
Link: http://lkml.kernel.org/r/20200302193630.68771-3-minchan@kernel.org
Link: http://lkml.kernel.org/r/20200508183320.GA125527@google.com
Link: http://lkml.kernel.org/r/20200622192900.22757-4-minchan@kernel.org
Link: https://lkml.kernel.org/r/20200901000633.1920247-4-minchan@kernel.org
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2020-10-18 09:27:10 -07:00

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# SPDX-License-Identifier: GPL-2.0 WITH Linux-syscall-note
#
# system call numbers and entry vectors for powerpc
#
# The format is:
# <number> <abi> <name> <entry point> <compat entry point>
#
# The <abi> can be common, spu, nospu, 64, or 32 for this file.
#
0 nospu restart_syscall sys_restart_syscall
1 nospu exit sys_exit
2 32 fork ppc_fork sys_fork
2 64 fork sys_fork
2 spu fork sys_ni_syscall
3 common read sys_read
4 common write sys_write
5 common open sys_open compat_sys_open
6 common close sys_close
7 common waitpid sys_waitpid
8 common creat sys_creat
9 common link sys_link
10 common unlink sys_unlink
11 nospu execve sys_execve compat_sys_execve
12 common chdir sys_chdir
13 32 time sys_time32
13 64 time sys_time
13 spu time sys_time
14 common mknod sys_mknod
15 common chmod sys_chmod
16 common lchown sys_lchown
17 common break sys_ni_syscall
18 32 oldstat sys_stat sys_ni_syscall
18 64 oldstat sys_ni_syscall
18 spu oldstat sys_ni_syscall
19 common lseek sys_lseek compat_sys_lseek
20 common getpid sys_getpid
21 nospu mount sys_mount
22 32 umount sys_oldumount
22 64 umount sys_ni_syscall
22 spu umount sys_ni_syscall
23 common setuid sys_setuid
24 common getuid sys_getuid
25 32 stime sys_stime32
25 64 stime sys_stime
25 spu stime sys_stime
26 nospu ptrace sys_ptrace compat_sys_ptrace
27 common alarm sys_alarm
28 32 oldfstat sys_fstat sys_ni_syscall
28 64 oldfstat sys_ni_syscall
28 spu oldfstat sys_ni_syscall
29 nospu pause sys_pause
30 32 utime sys_utime32
30 64 utime sys_utime
31 common stty sys_ni_syscall
32 common gtty sys_ni_syscall
33 common access sys_access
34 common nice sys_nice
35 common ftime sys_ni_syscall
36 common sync sys_sync
37 common kill sys_kill
38 common rename sys_rename
39 common mkdir sys_mkdir
40 common rmdir sys_rmdir
41 common dup sys_dup
42 common pipe sys_pipe
43 common times sys_times compat_sys_times
44 common prof sys_ni_syscall
45 common brk sys_brk
46 common setgid sys_setgid
47 common getgid sys_getgid
48 nospu signal sys_signal
49 common geteuid sys_geteuid
50 common getegid sys_getegid
51 nospu acct sys_acct
52 nospu umount2 sys_umount
53 common lock sys_ni_syscall
54 common ioctl sys_ioctl compat_sys_ioctl
55 common fcntl sys_fcntl compat_sys_fcntl
56 common mpx sys_ni_syscall
57 common setpgid sys_setpgid
58 common ulimit sys_ni_syscall
59 32 oldolduname sys_olduname
59 64 oldolduname sys_ni_syscall
59 spu oldolduname sys_ni_syscall
60 common umask sys_umask
61 common chroot sys_chroot
62 nospu ustat sys_ustat compat_sys_ustat
63 common dup2 sys_dup2
64 common getppid sys_getppid
65 common getpgrp sys_getpgrp
66 common setsid sys_setsid
67 32 sigaction sys_sigaction compat_sys_sigaction
67 64 sigaction sys_ni_syscall
67 spu sigaction sys_ni_syscall
68 common sgetmask sys_sgetmask
69 common ssetmask sys_ssetmask
70 common setreuid sys_setreuid
71 common setregid sys_setregid
72 32 sigsuspend sys_sigsuspend
72 64 sigsuspend sys_ni_syscall
72 spu sigsuspend sys_ni_syscall
73 32 sigpending sys_sigpending compat_sys_sigpending
73 64 sigpending sys_ni_syscall
73 spu sigpending sys_ni_syscall
74 common sethostname sys_sethostname
75 common setrlimit sys_setrlimit compat_sys_setrlimit
76 32 getrlimit sys_old_getrlimit compat_sys_old_getrlimit
76 64 getrlimit sys_ni_syscall
76 spu getrlimit sys_ni_syscall
77 common getrusage sys_getrusage compat_sys_getrusage
78 common gettimeofday sys_gettimeofday compat_sys_gettimeofday
79 common settimeofday sys_settimeofday compat_sys_settimeofday
80 common getgroups sys_getgroups
81 common setgroups sys_setgroups
82 32 select ppc_select sys_ni_syscall
82 64 select sys_ni_syscall
82 spu select sys_ni_syscall
83 common symlink sys_symlink
84 32 oldlstat sys_lstat sys_ni_syscall
84 64 oldlstat sys_ni_syscall
84 spu oldlstat sys_ni_syscall
85 common readlink sys_readlink
86 nospu uselib sys_uselib
87 nospu swapon sys_swapon
88 nospu reboot sys_reboot
89 32 readdir sys_old_readdir compat_sys_old_readdir
89 64 readdir sys_ni_syscall
89 spu readdir sys_ni_syscall
90 common mmap sys_mmap
91 common munmap sys_munmap
92 common truncate sys_truncate compat_sys_truncate
93 common ftruncate sys_ftruncate compat_sys_ftruncate
94 common fchmod sys_fchmod
95 common fchown sys_fchown
96 common getpriority sys_getpriority
97 common setpriority sys_setpriority
98 common profil sys_ni_syscall
99 nospu statfs sys_statfs compat_sys_statfs
100 nospu fstatfs sys_fstatfs compat_sys_fstatfs
101 common ioperm sys_ni_syscall
102 common socketcall sys_socketcall compat_sys_socketcall
103 common syslog sys_syslog
104 common setitimer sys_setitimer compat_sys_setitimer
105 common getitimer sys_getitimer compat_sys_getitimer
106 common stat sys_newstat compat_sys_newstat
107 common lstat sys_newlstat compat_sys_newlstat
108 common fstat sys_newfstat compat_sys_newfstat
109 32 olduname sys_uname
109 64 olduname sys_ni_syscall
109 spu olduname sys_ni_syscall
110 common iopl sys_ni_syscall
111 common vhangup sys_vhangup
112 common idle sys_ni_syscall
113 common vm86 sys_ni_syscall
114 common wait4 sys_wait4 compat_sys_wait4
115 nospu swapoff sys_swapoff
116 common sysinfo sys_sysinfo compat_sys_sysinfo
117 nospu ipc sys_ipc compat_sys_ipc
118 common fsync sys_fsync
119 32 sigreturn sys_sigreturn compat_sys_sigreturn
119 64 sigreturn sys_ni_syscall
119 spu sigreturn sys_ni_syscall
120 32 clone ppc_clone sys_clone
120 64 clone sys_clone
120 spu clone sys_ni_syscall
121 common setdomainname sys_setdomainname
122 common uname sys_newuname
123 common modify_ldt sys_ni_syscall
124 32 adjtimex sys_adjtimex_time32
124 64 adjtimex sys_adjtimex
124 spu adjtimex sys_adjtimex
125 common mprotect sys_mprotect
126 32 sigprocmask sys_sigprocmask compat_sys_sigprocmask
126 64 sigprocmask sys_ni_syscall
126 spu sigprocmask sys_ni_syscall
127 common create_module sys_ni_syscall
128 nospu init_module sys_init_module
129 nospu delete_module sys_delete_module
130 common get_kernel_syms sys_ni_syscall
131 nospu quotactl sys_quotactl
132 common getpgid sys_getpgid
133 common fchdir sys_fchdir
134 common bdflush sys_bdflush
135 common sysfs sys_sysfs
136 32 personality sys_personality ppc64_personality
136 64 personality ppc64_personality
136 spu personality ppc64_personality
137 common afs_syscall sys_ni_syscall
138 common setfsuid sys_setfsuid
139 common setfsgid sys_setfsgid
140 common _llseek sys_llseek
141 common getdents sys_getdents compat_sys_getdents
142 common _newselect sys_select compat_sys_select
143 common flock sys_flock
144 common msync sys_msync
145 common readv sys_readv
146 common writev sys_writev
147 common getsid sys_getsid
148 common fdatasync sys_fdatasync
149 nospu _sysctl sys_ni_syscall
150 common mlock sys_mlock
151 common munlock sys_munlock
152 common mlockall sys_mlockall
153 common munlockall sys_munlockall
154 common sched_setparam sys_sched_setparam
155 common sched_getparam sys_sched_getparam
156 common sched_setscheduler sys_sched_setscheduler
157 common sched_getscheduler sys_sched_getscheduler
158 common sched_yield sys_sched_yield
159 common sched_get_priority_max sys_sched_get_priority_max
160 common sched_get_priority_min sys_sched_get_priority_min
161 32 sched_rr_get_interval sys_sched_rr_get_interval_time32
161 64 sched_rr_get_interval sys_sched_rr_get_interval
161 spu sched_rr_get_interval sys_sched_rr_get_interval
162 32 nanosleep sys_nanosleep_time32
162 64 nanosleep sys_nanosleep
162 spu nanosleep sys_nanosleep
163 common mremap sys_mremap
164 common setresuid sys_setresuid
165 common getresuid sys_getresuid
166 common query_module sys_ni_syscall
167 common poll sys_poll
168 common nfsservctl sys_ni_syscall
169 common setresgid sys_setresgid
170 common getresgid sys_getresgid
171 common prctl sys_prctl
172 nospu rt_sigreturn sys_rt_sigreturn compat_sys_rt_sigreturn
173 nospu rt_sigaction sys_rt_sigaction compat_sys_rt_sigaction
174 nospu rt_sigprocmask sys_rt_sigprocmask compat_sys_rt_sigprocmask
175 nospu rt_sigpending sys_rt_sigpending compat_sys_rt_sigpending
176 32 rt_sigtimedwait sys_rt_sigtimedwait_time32 compat_sys_rt_sigtimedwait_time32
176 64 rt_sigtimedwait sys_rt_sigtimedwait
177 nospu rt_sigqueueinfo sys_rt_sigqueueinfo compat_sys_rt_sigqueueinfo
178 nospu rt_sigsuspend sys_rt_sigsuspend compat_sys_rt_sigsuspend
179 common pread64 sys_pread64 compat_sys_pread64
180 common pwrite64 sys_pwrite64 compat_sys_pwrite64
181 common chown sys_chown
182 common getcwd sys_getcwd
183 common capget sys_capget
184 common capset sys_capset
185 nospu sigaltstack sys_sigaltstack compat_sys_sigaltstack
186 32 sendfile sys_sendfile compat_sys_sendfile
186 64 sendfile sys_sendfile64
186 spu sendfile sys_sendfile64
187 common getpmsg sys_ni_syscall
188 common putpmsg sys_ni_syscall
189 32 vfork ppc_vfork sys_vfork
189 64 vfork sys_vfork
189 spu vfork sys_ni_syscall
190 common ugetrlimit sys_getrlimit compat_sys_getrlimit
191 common readahead sys_readahead compat_sys_readahead
192 32 mmap2 sys_mmap2 compat_sys_mmap2
193 32 truncate64 sys_truncate64 compat_sys_truncate64
194 32 ftruncate64 sys_ftruncate64 compat_sys_ftruncate64
195 32 stat64 sys_stat64
196 32 lstat64 sys_lstat64
197 32 fstat64 sys_fstat64
198 nospu pciconfig_read sys_pciconfig_read
199 nospu pciconfig_write sys_pciconfig_write
200 nospu pciconfig_iobase sys_pciconfig_iobase
201 common multiplexer sys_ni_syscall
202 common getdents64 sys_getdents64
203 common pivot_root sys_pivot_root
204 32 fcntl64 sys_fcntl64 compat_sys_fcntl64
205 common madvise sys_madvise
206 common mincore sys_mincore
207 common gettid sys_gettid
208 common tkill sys_tkill
209 common setxattr sys_setxattr
210 common lsetxattr sys_lsetxattr
211 common fsetxattr sys_fsetxattr
212 common getxattr sys_getxattr
213 common lgetxattr sys_lgetxattr
214 common fgetxattr sys_fgetxattr
215 common listxattr sys_listxattr
216 common llistxattr sys_llistxattr
217 common flistxattr sys_flistxattr
218 common removexattr sys_removexattr
219 common lremovexattr sys_lremovexattr
220 common fremovexattr sys_fremovexattr
221 32 futex sys_futex_time32
221 64 futex sys_futex
221 spu futex sys_futex
222 common sched_setaffinity sys_sched_setaffinity compat_sys_sched_setaffinity
223 common sched_getaffinity sys_sched_getaffinity compat_sys_sched_getaffinity
# 224 unused
225 common tuxcall sys_ni_syscall
226 32 sendfile64 sys_sendfile64 compat_sys_sendfile64
227 common io_setup sys_io_setup compat_sys_io_setup
228 common io_destroy sys_io_destroy
229 32 io_getevents sys_io_getevents_time32
229 64 io_getevents sys_io_getevents
229 spu io_getevents sys_io_getevents
230 common io_submit sys_io_submit compat_sys_io_submit
231 common io_cancel sys_io_cancel
232 nospu set_tid_address sys_set_tid_address
233 common fadvise64 sys_fadvise64 ppc32_fadvise64
234 nospu exit_group sys_exit_group
235 nospu lookup_dcookie sys_lookup_dcookie compat_sys_lookup_dcookie
236 common epoll_create sys_epoll_create
237 common epoll_ctl sys_epoll_ctl
238 common epoll_wait sys_epoll_wait
239 common remap_file_pages sys_remap_file_pages
240 common timer_create sys_timer_create compat_sys_timer_create
241 32 timer_settime sys_timer_settime32
241 64 timer_settime sys_timer_settime
241 spu timer_settime sys_timer_settime
242 32 timer_gettime sys_timer_gettime32
242 64 timer_gettime sys_timer_gettime
242 spu timer_gettime sys_timer_gettime
243 common timer_getoverrun sys_timer_getoverrun
244 common timer_delete sys_timer_delete
245 32 clock_settime sys_clock_settime32
245 64 clock_settime sys_clock_settime
245 spu clock_settime sys_clock_settime
246 32 clock_gettime sys_clock_gettime32
246 64 clock_gettime sys_clock_gettime
246 spu clock_gettime sys_clock_gettime
247 32 clock_getres sys_clock_getres_time32
247 64 clock_getres sys_clock_getres
247 spu clock_getres sys_clock_getres
248 32 clock_nanosleep sys_clock_nanosleep_time32
248 64 clock_nanosleep sys_clock_nanosleep
248 spu clock_nanosleep sys_clock_nanosleep
249 32 swapcontext ppc_swapcontext compat_sys_swapcontext
249 64 swapcontext sys_swapcontext
249 spu swapcontext sys_ni_syscall
250 common tgkill sys_tgkill
251 32 utimes sys_utimes_time32
251 64 utimes sys_utimes
251 spu utimes sys_utimes
252 common statfs64 sys_statfs64 compat_sys_statfs64
253 common fstatfs64 sys_fstatfs64 compat_sys_fstatfs64
254 32 fadvise64_64 ppc_fadvise64_64
254 spu fadvise64_64 sys_ni_syscall
255 common rtas sys_rtas
256 32 sys_debug_setcontext sys_debug_setcontext sys_ni_syscall
256 64 sys_debug_setcontext sys_ni_syscall
256 spu sys_debug_setcontext sys_ni_syscall
# 257 reserved for vserver
258 nospu migrate_pages sys_migrate_pages compat_sys_migrate_pages
259 nospu mbind sys_mbind compat_sys_mbind
260 nospu get_mempolicy sys_get_mempolicy compat_sys_get_mempolicy
261 nospu set_mempolicy sys_set_mempolicy compat_sys_set_mempolicy
262 nospu mq_open sys_mq_open compat_sys_mq_open
263 nospu mq_unlink sys_mq_unlink
264 32 mq_timedsend sys_mq_timedsend_time32
264 64 mq_timedsend sys_mq_timedsend
265 32 mq_timedreceive sys_mq_timedreceive_time32
265 64 mq_timedreceive sys_mq_timedreceive
266 nospu mq_notify sys_mq_notify compat_sys_mq_notify
267 nospu mq_getsetattr sys_mq_getsetattr compat_sys_mq_getsetattr
268 nospu kexec_load sys_kexec_load compat_sys_kexec_load
269 nospu add_key sys_add_key
270 nospu request_key sys_request_key
271 nospu keyctl sys_keyctl compat_sys_keyctl
272 nospu waitid sys_waitid compat_sys_waitid
273 nospu ioprio_set sys_ioprio_set
274 nospu ioprio_get sys_ioprio_get
275 nospu inotify_init sys_inotify_init
276 nospu inotify_add_watch sys_inotify_add_watch
277 nospu inotify_rm_watch sys_inotify_rm_watch
278 nospu spu_run sys_spu_run
279 nospu spu_create sys_spu_create
280 32 pselect6 sys_pselect6_time32 compat_sys_pselect6_time32
280 64 pselect6 sys_pselect6
281 32 ppoll sys_ppoll_time32 compat_sys_ppoll_time32
281 64 ppoll sys_ppoll
282 common unshare sys_unshare
283 common splice sys_splice
284 common tee sys_tee
285 common vmsplice sys_vmsplice
286 common openat sys_openat compat_sys_openat
287 common mkdirat sys_mkdirat
288 common mknodat sys_mknodat
289 common fchownat sys_fchownat
290 32 futimesat sys_futimesat_time32
290 64 futimesat sys_futimesat
290 spu utimesat sys_futimesat
291 32 fstatat64 sys_fstatat64
291 64 newfstatat sys_newfstatat
291 spu newfstatat sys_newfstatat
292 common unlinkat sys_unlinkat
293 common renameat sys_renameat
294 common linkat sys_linkat
295 common symlinkat sys_symlinkat
296 common readlinkat sys_readlinkat
297 common fchmodat sys_fchmodat
298 common faccessat sys_faccessat
299 common get_robust_list sys_get_robust_list compat_sys_get_robust_list
300 common set_robust_list sys_set_robust_list compat_sys_set_robust_list
301 common move_pages sys_move_pages compat_sys_move_pages
302 common getcpu sys_getcpu
303 nospu epoll_pwait sys_epoll_pwait compat_sys_epoll_pwait
304 32 utimensat sys_utimensat_time32
304 64 utimensat sys_utimensat
304 spu utimensat sys_utimensat
305 common signalfd sys_signalfd compat_sys_signalfd
306 common timerfd_create sys_timerfd_create
307 common eventfd sys_eventfd
308 common sync_file_range2 sys_sync_file_range2 compat_sys_sync_file_range2
309 nospu fallocate sys_fallocate compat_sys_fallocate
310 nospu subpage_prot sys_subpage_prot
311 32 timerfd_settime sys_timerfd_settime32
311 64 timerfd_settime sys_timerfd_settime
311 spu timerfd_settime sys_timerfd_settime
312 32 timerfd_gettime sys_timerfd_gettime32
312 64 timerfd_gettime sys_timerfd_gettime
312 spu timerfd_gettime sys_timerfd_gettime
313 common signalfd4 sys_signalfd4 compat_sys_signalfd4
314 common eventfd2 sys_eventfd2
315 common epoll_create1 sys_epoll_create1
316 common dup3 sys_dup3
317 common pipe2 sys_pipe2
318 nospu inotify_init1 sys_inotify_init1
319 common perf_event_open sys_perf_event_open
320 common preadv sys_preadv compat_sys_preadv
321 common pwritev sys_pwritev compat_sys_pwritev
322 nospu rt_tgsigqueueinfo sys_rt_tgsigqueueinfo compat_sys_rt_tgsigqueueinfo
323 nospu fanotify_init sys_fanotify_init
324 nospu fanotify_mark sys_fanotify_mark compat_sys_fanotify_mark
325 common prlimit64 sys_prlimit64
326 common socket sys_socket
327 common bind sys_bind
328 common connect sys_connect
329 common listen sys_listen
330 common accept sys_accept
331 common getsockname sys_getsockname
332 common getpeername sys_getpeername
333 common socketpair sys_socketpair
334 common send sys_send
335 common sendto sys_sendto
336 common recv sys_recv compat_sys_recv
337 common recvfrom sys_recvfrom compat_sys_recvfrom
338 common shutdown sys_shutdown
339 common setsockopt sys_setsockopt sys_setsockopt
340 common getsockopt sys_getsockopt sys_getsockopt
341 common sendmsg sys_sendmsg compat_sys_sendmsg
342 common recvmsg sys_recvmsg compat_sys_recvmsg
343 32 recvmmsg sys_recvmmsg_time32 compat_sys_recvmmsg_time32
343 64 recvmmsg sys_recvmmsg
343 spu recvmmsg sys_recvmmsg
344 common accept4 sys_accept4
345 common name_to_handle_at sys_name_to_handle_at
346 common open_by_handle_at sys_open_by_handle_at compat_sys_open_by_handle_at
347 32 clock_adjtime sys_clock_adjtime32
347 64 clock_adjtime sys_clock_adjtime
347 spu clock_adjtime sys_clock_adjtime
348 common syncfs sys_syncfs
349 common sendmmsg sys_sendmmsg compat_sys_sendmmsg
350 common setns sys_setns
351 nospu process_vm_readv sys_process_vm_readv
352 nospu process_vm_writev sys_process_vm_writev
353 nospu finit_module sys_finit_module
354 nospu kcmp sys_kcmp
355 common sched_setattr sys_sched_setattr
356 common sched_getattr sys_sched_getattr
357 common renameat2 sys_renameat2
358 common seccomp sys_seccomp
359 common getrandom sys_getrandom
360 common memfd_create sys_memfd_create
361 common bpf sys_bpf
362 nospu execveat sys_execveat compat_sys_execveat
363 32 switch_endian sys_ni_syscall
363 64 switch_endian sys_switch_endian
363 spu switch_endian sys_ni_syscall
364 common userfaultfd sys_userfaultfd
365 common membarrier sys_membarrier
# 366-377 originally left for IPC, now unused
378 nospu mlock2 sys_mlock2
379 nospu copy_file_range sys_copy_file_range
380 common preadv2 sys_preadv2 compat_sys_preadv2
381 common pwritev2 sys_pwritev2 compat_sys_pwritev2
382 nospu kexec_file_load sys_kexec_file_load
383 nospu statx sys_statx
384 nospu pkey_alloc sys_pkey_alloc
385 nospu pkey_free sys_pkey_free
386 nospu pkey_mprotect sys_pkey_mprotect
387 nospu rseq sys_rseq
388 32 io_pgetevents sys_io_pgetevents_time32 compat_sys_io_pgetevents
388 64 io_pgetevents sys_io_pgetevents
# room for arch specific syscalls
392 64 semtimedop sys_semtimedop
393 common semget sys_semget
394 common semctl sys_semctl compat_sys_semctl
395 common shmget sys_shmget
396 common shmctl sys_shmctl compat_sys_shmctl
397 common shmat sys_shmat compat_sys_shmat
398 common shmdt sys_shmdt
399 common msgget sys_msgget
400 common msgsnd sys_msgsnd compat_sys_msgsnd
401 common msgrcv sys_msgrcv compat_sys_msgrcv
402 common msgctl sys_msgctl compat_sys_msgctl
403 32 clock_gettime64 sys_clock_gettime sys_clock_gettime
404 32 clock_settime64 sys_clock_settime sys_clock_settime
405 32 clock_adjtime64 sys_clock_adjtime sys_clock_adjtime
406 32 clock_getres_time64 sys_clock_getres sys_clock_getres
407 32 clock_nanosleep_time64 sys_clock_nanosleep sys_clock_nanosleep
408 32 timer_gettime64 sys_timer_gettime sys_timer_gettime
409 32 timer_settime64 sys_timer_settime sys_timer_settime
410 32 timerfd_gettime64 sys_timerfd_gettime sys_timerfd_gettime
411 32 timerfd_settime64 sys_timerfd_settime sys_timerfd_settime
412 32 utimensat_time64 sys_utimensat sys_utimensat
413 32 pselect6_time64 sys_pselect6 compat_sys_pselect6_time64
414 32 ppoll_time64 sys_ppoll compat_sys_ppoll_time64
416 32 io_pgetevents_time64 sys_io_pgetevents sys_io_pgetevents
417 32 recvmmsg_time64 sys_recvmmsg compat_sys_recvmmsg_time64
418 32 mq_timedsend_time64 sys_mq_timedsend sys_mq_timedsend
419 32 mq_timedreceive_time64 sys_mq_timedreceive sys_mq_timedreceive
420 32 semtimedop_time64 sys_semtimedop sys_semtimedop
421 32 rt_sigtimedwait_time64 sys_rt_sigtimedwait compat_sys_rt_sigtimedwait_time64
422 32 futex_time64 sys_futex sys_futex
423 32 sched_rr_get_interval_time64 sys_sched_rr_get_interval sys_sched_rr_get_interval
424 common pidfd_send_signal sys_pidfd_send_signal
425 common io_uring_setup sys_io_uring_setup
426 common io_uring_enter sys_io_uring_enter
427 common io_uring_register sys_io_uring_register
428 common open_tree sys_open_tree
429 common move_mount sys_move_mount
430 common fsopen sys_fsopen
431 common fsconfig sys_fsconfig
432 common fsmount sys_fsmount
433 common fspick sys_fspick
434 common pidfd_open sys_pidfd_open
435 32 clone3 ppc_clone3 sys_clone3
435 64 clone3 sys_clone3
435 spu clone3 sys_ni_syscall
436 common close_range sys_close_range
437 common openat2 sys_openat2
438 common pidfd_getfd sys_pidfd_getfd
439 common faccessat2 sys_faccessat2
440 common process_madvise sys_process_madvise
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