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linux/arch/alpha/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 alpha
#
# The format is:
# <number> <abi> <name> <entry point>
#
# The <abi> is always "common" for this file
#
0 common osf_syscall alpha_syscall_zero
1 common exit sys_exit
2 common fork alpha_fork
3 common read sys_read
4 common write sys_write
5 common osf_old_open sys_ni_syscall
6 common close sys_close
7 common osf_wait4 sys_osf_wait4
8 common osf_old_creat sys_ni_syscall
9 common link sys_link
10 common unlink sys_unlink
11 common osf_execve sys_ni_syscall
12 common chdir sys_chdir
13 common fchdir sys_fchdir
14 common mknod sys_mknod
15 common chmod sys_chmod
16 common chown sys_chown
17 common brk sys_osf_brk
18 common osf_getfsstat sys_ni_syscall
19 common lseek sys_lseek
20 common getxpid sys_getxpid
21 common osf_mount sys_osf_mount
22 common umount2 sys_umount
23 common setuid sys_setuid
24 common getxuid sys_getxuid
25 common exec_with_loader sys_ni_syscall
26 common ptrace sys_ptrace
27 common osf_nrecvmsg sys_ni_syscall
28 common osf_nsendmsg sys_ni_syscall
29 common osf_nrecvfrom sys_ni_syscall
30 common osf_naccept sys_ni_syscall
31 common osf_ngetpeername sys_ni_syscall
32 common osf_ngetsockname sys_ni_syscall
33 common access sys_access
34 common osf_chflags sys_ni_syscall
35 common osf_fchflags sys_ni_syscall
36 common sync sys_sync
37 common kill sys_kill
38 common osf_old_stat sys_ni_syscall
39 common setpgid sys_setpgid
40 common osf_old_lstat sys_ni_syscall
41 common dup sys_dup
42 common pipe sys_alpha_pipe
43 common osf_set_program_attributes sys_osf_set_program_attributes
44 common osf_profil sys_ni_syscall
45 common open sys_open
46 common osf_old_sigaction sys_ni_syscall
47 common getxgid sys_getxgid
48 common osf_sigprocmask sys_osf_sigprocmask
49 common osf_getlogin sys_ni_syscall
50 common osf_setlogin sys_ni_syscall
51 common acct sys_acct
52 common sigpending sys_sigpending
54 common ioctl sys_ioctl
55 common osf_reboot sys_ni_syscall
56 common osf_revoke sys_ni_syscall
57 common symlink sys_symlink
58 common readlink sys_readlink
59 common execve sys_execve
60 common umask sys_umask
61 common chroot sys_chroot
62 common osf_old_fstat sys_ni_syscall
63 common getpgrp sys_getpgrp
64 common getpagesize sys_getpagesize
65 common osf_mremap sys_ni_syscall
66 common vfork alpha_vfork
67 common stat sys_newstat
68 common lstat sys_newlstat
69 common osf_sbrk sys_ni_syscall
70 common osf_sstk sys_ni_syscall
71 common mmap sys_osf_mmap
72 common osf_old_vadvise sys_ni_syscall
73 common munmap sys_munmap
74 common mprotect sys_mprotect
75 common madvise sys_madvise
76 common vhangup sys_vhangup
77 common osf_kmodcall sys_ni_syscall
78 common osf_mincore sys_ni_syscall
79 common getgroups sys_getgroups
80 common setgroups sys_setgroups
81 common osf_old_getpgrp sys_ni_syscall
82 common setpgrp sys_setpgid
83 common osf_setitimer compat_sys_setitimer
84 common osf_old_wait sys_ni_syscall
85 common osf_table sys_ni_syscall
86 common osf_getitimer compat_sys_getitimer
87 common gethostname sys_gethostname
88 common sethostname sys_sethostname
89 common getdtablesize sys_getdtablesize
90 common dup2 sys_dup2
91 common fstat sys_newfstat
92 common fcntl sys_fcntl
93 common osf_select sys_osf_select
94 common poll sys_poll
95 common fsync sys_fsync
96 common setpriority sys_setpriority
97 common socket sys_socket
98 common connect sys_connect
99 common accept sys_accept
100 common getpriority sys_osf_getpriority
101 common send sys_send
102 common recv sys_recv
103 common sigreturn sys_sigreturn
104 common bind sys_bind
105 common setsockopt sys_setsockopt
106 common listen sys_listen
107 common osf_plock sys_ni_syscall
108 common osf_old_sigvec sys_ni_syscall
109 common osf_old_sigblock sys_ni_syscall
110 common osf_old_sigsetmask sys_ni_syscall
111 common sigsuspend sys_sigsuspend
112 common osf_sigstack sys_osf_sigstack
113 common recvmsg sys_recvmsg
114 common sendmsg sys_sendmsg
115 common osf_old_vtrace sys_ni_syscall
116 common osf_gettimeofday sys_osf_gettimeofday
117 common osf_getrusage sys_osf_getrusage
118 common getsockopt sys_getsockopt
120 common readv sys_osf_readv
121 common writev sys_osf_writev
122 common osf_settimeofday sys_osf_settimeofday
123 common fchown sys_fchown
124 common fchmod sys_fchmod
125 common recvfrom sys_recvfrom
126 common setreuid sys_setreuid
127 common setregid sys_setregid
128 common rename sys_rename
129 common truncate sys_truncate
130 common ftruncate sys_ftruncate
131 common flock sys_flock
132 common setgid sys_setgid
133 common sendto sys_sendto
134 common shutdown sys_shutdown
135 common socketpair sys_socketpair
136 common mkdir sys_mkdir
137 common rmdir sys_rmdir
138 common osf_utimes sys_osf_utimes
139 common osf_old_sigreturn sys_ni_syscall
140 common osf_adjtime sys_ni_syscall
141 common getpeername sys_getpeername
142 common osf_gethostid sys_ni_syscall
143 common osf_sethostid sys_ni_syscall
144 common getrlimit sys_getrlimit
145 common setrlimit sys_setrlimit
146 common osf_old_killpg sys_ni_syscall
147 common setsid sys_setsid
148 common quotactl sys_quotactl
149 common osf_oldquota sys_ni_syscall
150 common getsockname sys_getsockname
153 common osf_pid_block sys_ni_syscall
154 common osf_pid_unblock sys_ni_syscall
156 common sigaction sys_osf_sigaction
157 common osf_sigwaitprim sys_ni_syscall
158 common osf_nfssvc sys_ni_syscall
159 common osf_getdirentries sys_osf_getdirentries
160 common osf_statfs sys_osf_statfs
161 common osf_fstatfs sys_osf_fstatfs
163 common osf_asynch_daemon sys_ni_syscall
164 common osf_getfh sys_ni_syscall
165 common osf_getdomainname sys_osf_getdomainname
166 common setdomainname sys_setdomainname
169 common osf_exportfs sys_ni_syscall
181 common osf_alt_plock sys_ni_syscall
184 common osf_getmnt sys_ni_syscall
187 common osf_alt_sigpending sys_ni_syscall
188 common osf_alt_setsid sys_ni_syscall
199 common osf_swapon sys_swapon
200 common msgctl sys_old_msgctl
201 common msgget sys_msgget
202 common msgrcv sys_msgrcv
203 common msgsnd sys_msgsnd
204 common semctl sys_old_semctl
205 common semget sys_semget
206 common semop sys_semop
207 common osf_utsname sys_osf_utsname
208 common lchown sys_lchown
209 common shmat sys_shmat
210 common shmctl sys_old_shmctl
211 common shmdt sys_shmdt
212 common shmget sys_shmget
213 common osf_mvalid sys_ni_syscall
214 common osf_getaddressconf sys_ni_syscall
215 common osf_msleep sys_ni_syscall
216 common osf_mwakeup sys_ni_syscall
217 common msync sys_msync
218 common osf_signal sys_ni_syscall
219 common osf_utc_gettime sys_ni_syscall
220 common osf_utc_adjtime sys_ni_syscall
222 common osf_security sys_ni_syscall
223 common osf_kloadcall sys_ni_syscall
224 common osf_stat sys_osf_stat
225 common osf_lstat sys_osf_lstat
226 common osf_fstat sys_osf_fstat
227 common osf_statfs64 sys_osf_statfs64
228 common osf_fstatfs64 sys_osf_fstatfs64
233 common getpgid sys_getpgid
234 common getsid sys_getsid
235 common sigaltstack sys_sigaltstack
236 common osf_waitid sys_ni_syscall
237 common osf_priocntlset sys_ni_syscall
238 common osf_sigsendset sys_ni_syscall
239 common osf_set_speculative sys_ni_syscall
240 common osf_msfs_syscall sys_ni_syscall
241 common osf_sysinfo sys_osf_sysinfo
242 common osf_uadmin sys_ni_syscall
243 common osf_fuser sys_ni_syscall
244 common osf_proplist_syscall sys_osf_proplist_syscall
245 common osf_ntp_adjtime sys_ni_syscall
246 common osf_ntp_gettime sys_ni_syscall
247 common osf_pathconf sys_ni_syscall
248 common osf_fpathconf sys_ni_syscall
250 common osf_uswitch sys_ni_syscall
251 common osf_usleep_thread sys_osf_usleep_thread
252 common osf_audcntl sys_ni_syscall
253 common osf_audgen sys_ni_syscall
254 common sysfs sys_sysfs
255 common osf_subsys_info sys_ni_syscall
256 common osf_getsysinfo sys_osf_getsysinfo
257 common osf_setsysinfo sys_osf_setsysinfo
258 common osf_afs_syscall sys_ni_syscall
259 common osf_swapctl sys_ni_syscall
260 common osf_memcntl sys_ni_syscall
261 common osf_fdatasync sys_ni_syscall
300 common bdflush sys_bdflush
301 common sethae sys_sethae
302 common mount sys_mount
303 common old_adjtimex sys_old_adjtimex
304 common swapoff sys_swapoff
305 common getdents sys_getdents
306 common create_module sys_ni_syscall
307 common init_module sys_init_module
308 common delete_module sys_delete_module
309 common get_kernel_syms sys_ni_syscall
310 common syslog sys_syslog
311 common reboot sys_reboot
312 common clone alpha_clone
313 common uselib sys_uselib
314 common mlock sys_mlock
315 common munlock sys_munlock
316 common mlockall sys_mlockall
317 common munlockall sys_munlockall
318 common sysinfo sys_sysinfo
319 common _sysctl sys_ni_syscall
# 320 was sys_idle
321 common oldumount sys_oldumount
322 common swapon sys_swapon
323 common times sys_times
324 common personality sys_personality
325 common setfsuid sys_setfsuid
326 common setfsgid sys_setfsgid
327 common ustat sys_ustat
328 common statfs sys_statfs
329 common fstatfs sys_fstatfs
330 common sched_setparam sys_sched_setparam
331 common sched_getparam sys_sched_getparam
332 common sched_setscheduler sys_sched_setscheduler
333 common sched_getscheduler sys_sched_getscheduler
334 common sched_yield sys_sched_yield
335 common sched_get_priority_max sys_sched_get_priority_max
336 common sched_get_priority_min sys_sched_get_priority_min
337 common sched_rr_get_interval sys_sched_rr_get_interval
338 common afs_syscall sys_ni_syscall
339 common uname sys_newuname
340 common nanosleep sys_nanosleep
341 common mremap sys_mremap
342 common nfsservctl sys_ni_syscall
343 common setresuid sys_setresuid
344 common getresuid sys_getresuid
345 common pciconfig_read sys_pciconfig_read
346 common pciconfig_write sys_pciconfig_write
347 common query_module sys_ni_syscall
348 common prctl sys_prctl
349 common pread64 sys_pread64
350 common pwrite64 sys_pwrite64
351 common rt_sigreturn sys_rt_sigreturn
352 common rt_sigaction sys_rt_sigaction
353 common rt_sigprocmask sys_rt_sigprocmask
354 common rt_sigpending sys_rt_sigpending
355 common rt_sigtimedwait sys_rt_sigtimedwait
356 common rt_sigqueueinfo sys_rt_sigqueueinfo
357 common rt_sigsuspend sys_rt_sigsuspend
358 common select sys_select
359 common gettimeofday sys_gettimeofday
360 common settimeofday sys_settimeofday
361 common getitimer sys_getitimer
362 common setitimer sys_setitimer
363 common utimes sys_utimes
364 common getrusage sys_getrusage
365 common wait4 sys_wait4
366 common adjtimex sys_adjtimex
367 common getcwd sys_getcwd
368 common capget sys_capget
369 common capset sys_capset
370 common sendfile sys_sendfile64
371 common setresgid sys_setresgid
372 common getresgid sys_getresgid
373 common dipc sys_ni_syscall
374 common pivot_root sys_pivot_root
375 common mincore sys_mincore
376 common pciconfig_iobase sys_pciconfig_iobase
377 common getdents64 sys_getdents64
378 common gettid sys_gettid
379 common readahead sys_readahead
# 380 is unused
381 common tkill sys_tkill
382 common setxattr sys_setxattr
383 common lsetxattr sys_lsetxattr
384 common fsetxattr sys_fsetxattr
385 common getxattr sys_getxattr
386 common lgetxattr sys_lgetxattr
387 common fgetxattr sys_fgetxattr
388 common listxattr sys_listxattr
389 common llistxattr sys_llistxattr
390 common flistxattr sys_flistxattr
391 common removexattr sys_removexattr
392 common lremovexattr sys_lremovexattr
393 common fremovexattr sys_fremovexattr
394 common futex sys_futex
395 common sched_setaffinity sys_sched_setaffinity
396 common sched_getaffinity sys_sched_getaffinity
397 common tuxcall sys_ni_syscall
398 common io_setup sys_io_setup
399 common io_destroy sys_io_destroy
400 common io_getevents sys_io_getevents
401 common io_submit sys_io_submit
402 common io_cancel sys_io_cancel
405 common exit_group sys_exit_group
406 common lookup_dcookie sys_lookup_dcookie
407 common epoll_create sys_epoll_create
408 common epoll_ctl sys_epoll_ctl
409 common epoll_wait sys_epoll_wait
410 common remap_file_pages sys_remap_file_pages
411 common set_tid_address sys_set_tid_address
412 common restart_syscall sys_restart_syscall
413 common fadvise64 sys_fadvise64
414 common timer_create sys_timer_create
415 common timer_settime sys_timer_settime
416 common timer_gettime sys_timer_gettime
417 common timer_getoverrun sys_timer_getoverrun
418 common timer_delete sys_timer_delete
419 common clock_settime sys_clock_settime
420 common clock_gettime sys_clock_gettime
421 common clock_getres sys_clock_getres
422 common clock_nanosleep sys_clock_nanosleep
423 common semtimedop sys_semtimedop
424 common tgkill sys_tgkill
425 common stat64 sys_stat64
426 common lstat64 sys_lstat64
427 common fstat64 sys_fstat64
428 common vserver sys_ni_syscall
429 common mbind sys_ni_syscall
430 common get_mempolicy sys_ni_syscall
431 common set_mempolicy sys_ni_syscall
432 common mq_open sys_mq_open
433 common mq_unlink sys_mq_unlink
434 common mq_timedsend sys_mq_timedsend
435 common mq_timedreceive sys_mq_timedreceive
436 common mq_notify sys_mq_notify
437 common mq_getsetattr sys_mq_getsetattr
438 common waitid sys_waitid
439 common add_key sys_add_key
440 common request_key sys_request_key
441 common keyctl sys_keyctl
442 common ioprio_set sys_ioprio_set
443 common ioprio_get sys_ioprio_get
444 common inotify_init sys_inotify_init
445 common inotify_add_watch sys_inotify_add_watch
446 common inotify_rm_watch sys_inotify_rm_watch
447 common fdatasync sys_fdatasync
448 common kexec_load sys_kexec_load
449 common migrate_pages sys_migrate_pages
450 common openat sys_openat
451 common mkdirat sys_mkdirat
452 common mknodat sys_mknodat
453 common fchownat sys_fchownat
454 common futimesat sys_futimesat
455 common fstatat64 sys_fstatat64
456 common unlinkat sys_unlinkat
457 common renameat sys_renameat
458 common linkat sys_linkat
459 common symlinkat sys_symlinkat
460 common readlinkat sys_readlinkat
461 common fchmodat sys_fchmodat
462 common faccessat sys_faccessat
463 common pselect6 sys_pselect6
464 common ppoll sys_ppoll
465 common unshare sys_unshare
466 common set_robust_list sys_set_robust_list
467 common get_robust_list sys_get_robust_list
468 common splice sys_splice
469 common sync_file_range sys_sync_file_range
470 common tee sys_tee
471 common vmsplice sys_vmsplice
472 common move_pages sys_move_pages
473 common getcpu sys_getcpu
474 common epoll_pwait sys_epoll_pwait
475 common utimensat sys_utimensat
476 common signalfd sys_signalfd
477 common timerfd sys_ni_syscall
478 common eventfd sys_eventfd
479 common recvmmsg sys_recvmmsg
480 common fallocate sys_fallocate
481 common timerfd_create sys_timerfd_create
482 common timerfd_settime sys_timerfd_settime
483 common timerfd_gettime sys_timerfd_gettime
484 common signalfd4 sys_signalfd4
485 common eventfd2 sys_eventfd2
486 common epoll_create1 sys_epoll_create1
487 common dup3 sys_dup3
488 common pipe2 sys_pipe2
489 common inotify_init1 sys_inotify_init1
490 common preadv sys_preadv
491 common pwritev sys_pwritev
492 common rt_tgsigqueueinfo sys_rt_tgsigqueueinfo
493 common perf_event_open sys_perf_event_open
494 common fanotify_init sys_fanotify_init
495 common fanotify_mark sys_fanotify_mark
496 common prlimit64 sys_prlimit64
497 common name_to_handle_at sys_name_to_handle_at
498 common open_by_handle_at sys_open_by_handle_at
499 common clock_adjtime sys_clock_adjtime
500 common syncfs sys_syncfs
501 common setns sys_setns
502 common accept4 sys_accept4
503 common sendmmsg sys_sendmmsg
504 common process_vm_readv sys_process_vm_readv
505 common process_vm_writev sys_process_vm_writev
506 common kcmp sys_kcmp
507 common finit_module sys_finit_module
508 common sched_setattr sys_sched_setattr
509 common sched_getattr sys_sched_getattr
510 common renameat2 sys_renameat2
511 common getrandom sys_getrandom
512 common memfd_create sys_memfd_create
513 common execveat sys_execveat
514 common seccomp sys_seccomp
515 common bpf sys_bpf
516 common userfaultfd sys_userfaultfd
517 common membarrier sys_membarrier
518 common mlock2 sys_mlock2
519 common copy_file_range sys_copy_file_range
520 common preadv2 sys_preadv2
521 common pwritev2 sys_pwritev2
522 common statx sys_statx
523 common io_pgetevents sys_io_pgetevents
524 common pkey_mprotect sys_pkey_mprotect
525 common pkey_alloc sys_pkey_alloc
526 common pkey_free sys_pkey_free
527 common rseq sys_rseq
528 common statfs64 sys_statfs64
529 common fstatfs64 sys_fstatfs64
530 common getegid sys_getegid
531 common geteuid sys_geteuid
532 common getppid sys_getppid
# all other architectures have common numbers for new syscall, alpha
# is the exception.
534 common pidfd_send_signal sys_pidfd_send_signal
535 common io_uring_setup sys_io_uring_setup
536 common io_uring_enter sys_io_uring_enter
537 common io_uring_register sys_io_uring_register
538 common open_tree sys_open_tree
539 common move_mount sys_move_mount
540 common fsopen sys_fsopen
541 common fsconfig sys_fsconfig
542 common fsmount sys_fsmount
543 common fspick sys_fspick
544 common pidfd_open sys_pidfd_open
# 545 reserved for clone3
546 common close_range sys_close_range
547 common openat2 sys_openat2
548 common pidfd_getfd sys_pidfd_getfd
549 common faccessat2 sys_faccessat2
550 common process_madvise sys_process_madvise
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