d21832e212
checksyscalls.sh is run at every "make" run while building the kernel,
even if no files have changed. I looked at where we spend time in
a trivial empty rebuild and found checksyscalls.sh to be a source
of noticeable overhead, as it spawns a lot of child processes just
to call 'cat' copying from stdin to stdout, once for each of the
over 400 x86 syscalls.
Using a shell-builtin (echo) instead of the external command gives
us a 13x speedup:
Before After
real 0m1.018s real 0m0.077s
user 0m0.068s user 0m0.048s
sys 0m0.156s sys 0m0.024s
The time it took to rebuild a single file on my machine dropped
from 5.5 seconds to 4.5 seconds.
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
215 lines
5.6 KiB
Bash
Executable File
215 lines
5.6 KiB
Bash
Executable File
#!/bin/sh
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#
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# Check if current architecture are missing any function calls compared
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# to i386.
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# i386 define a number of legacy system calls that are i386 specific
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# and listed below so they are ignored.
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#
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# Usage:
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# checksyscalls.sh gcc gcc-options
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#
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ignore_list() {
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cat << EOF
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#include <asm/types.h>
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#include <asm/unistd.h>
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/* *at */
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#define __IGNORE_open /* openat */
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#define __IGNORE_link /* linkat */
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#define __IGNORE_unlink /* unlinkat */
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#define __IGNORE_mknod /* mknodat */
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#define __IGNORE_chmod /* fchmodat */
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#define __IGNORE_chown /* fchownat */
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#define __IGNORE_mkdir /* mkdirat */
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#define __IGNORE_rmdir /* unlinkat */
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#define __IGNORE_lchown /* fchownat */
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#define __IGNORE_access /* faccessat */
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#define __IGNORE_rename /* renameat2 */
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#define __IGNORE_readlink /* readlinkat */
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#define __IGNORE_symlink /* symlinkat */
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#define __IGNORE_utimes /* futimesat */
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#if BITS_PER_LONG == 64
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#define __IGNORE_stat /* fstatat */
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#define __IGNORE_lstat /* fstatat */
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#else
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#define __IGNORE_stat64 /* fstatat64 */
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#define __IGNORE_lstat64 /* fstatat64 */
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#endif
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/* Missing flags argument */
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#define __IGNORE_renameat /* renameat2 */
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/* CLOEXEC flag */
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#define __IGNORE_pipe /* pipe2 */
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#define __IGNORE_dup2 /* dup3 */
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#define __IGNORE_epoll_create /* epoll_create1 */
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#define __IGNORE_inotify_init /* inotify_init1 */
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#define __IGNORE_eventfd /* eventfd2 */
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#define __IGNORE_signalfd /* signalfd4 */
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/* MMU */
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#ifndef CONFIG_MMU
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#define __IGNORE_madvise
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#define __IGNORE_mbind
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#define __IGNORE_mincore
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#define __IGNORE_mlock
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#define __IGNORE_mlockall
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#define __IGNORE_munlock
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#define __IGNORE_munlockall
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#define __IGNORE_mprotect
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#define __IGNORE_msync
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#define __IGNORE_migrate_pages
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#define __IGNORE_move_pages
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#define __IGNORE_remap_file_pages
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#define __IGNORE_get_mempolicy
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#define __IGNORE_set_mempolicy
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#define __IGNORE_swapoff
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#define __IGNORE_swapon
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#endif
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/* System calls for 32-bit kernels only */
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#if BITS_PER_LONG == 64
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#define __IGNORE_sendfile64
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#define __IGNORE_ftruncate64
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#define __IGNORE_truncate64
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#define __IGNORE_stat64
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#define __IGNORE_lstat64
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#define __IGNORE_fstat64
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#define __IGNORE_fcntl64
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#define __IGNORE_fadvise64_64
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#define __IGNORE_fstatat64
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#define __IGNORE_fstatfs64
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#define __IGNORE_statfs64
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#define __IGNORE_llseek
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#define __IGNORE_mmap2
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#else
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#define __IGNORE_sendfile
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#define __IGNORE_ftruncate
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#define __IGNORE_truncate
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#define __IGNORE_stat
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#define __IGNORE_lstat
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#define __IGNORE_fstat
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#define __IGNORE_fcntl
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#define __IGNORE_fadvise64
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#define __IGNORE_newfstatat
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#define __IGNORE_fstatfs
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#define __IGNORE_statfs
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#define __IGNORE_lseek
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#define __IGNORE_mmap
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#endif
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/* i386-specific or historical system calls */
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#define __IGNORE_break
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#define __IGNORE_stty
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#define __IGNORE_gtty
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#define __IGNORE_ftime
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#define __IGNORE_prof
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#define __IGNORE_lock
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#define __IGNORE_mpx
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#define __IGNORE_ulimit
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#define __IGNORE_profil
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#define __IGNORE_ioperm
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#define __IGNORE_iopl
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#define __IGNORE_idle
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#define __IGNORE_modify_ldt
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#define __IGNORE_ugetrlimit
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#define __IGNORE_vm86
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#define __IGNORE_vm86old
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#define __IGNORE_set_thread_area
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#define __IGNORE_get_thread_area
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#define __IGNORE_madvise1
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#define __IGNORE_oldstat
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#define __IGNORE_oldfstat
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#define __IGNORE_oldlstat
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#define __IGNORE_oldolduname
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#define __IGNORE_olduname
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#define __IGNORE_umount
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#define __IGNORE_waitpid
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#define __IGNORE_stime
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#define __IGNORE_nice
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#define __IGNORE_signal
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#define __IGNORE_sigaction
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#define __IGNORE_sgetmask
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#define __IGNORE_sigsuspend
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#define __IGNORE_sigpending
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#define __IGNORE_ssetmask
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#define __IGNORE_readdir
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#define __IGNORE_socketcall
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#define __IGNORE_ipc
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#define __IGNORE_sigreturn
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#define __IGNORE_sigprocmask
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#define __IGNORE_bdflush
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#define __IGNORE__llseek
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#define __IGNORE__newselect
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#define __IGNORE_create_module
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#define __IGNORE_query_module
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#define __IGNORE_get_kernel_syms
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#define __IGNORE_sysfs
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#define __IGNORE_uselib
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#define __IGNORE__sysctl
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#define __IGNORE_arch_prctl
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/* ... including the "new" 32-bit uid syscalls */
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#define __IGNORE_lchown32
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#define __IGNORE_getuid32
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#define __IGNORE_getgid32
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#define __IGNORE_geteuid32
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#define __IGNORE_getegid32
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#define __IGNORE_setreuid32
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#define __IGNORE_setregid32
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#define __IGNORE_getgroups32
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#define __IGNORE_setgroups32
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#define __IGNORE_fchown32
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#define __IGNORE_setresuid32
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#define __IGNORE_getresuid32
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#define __IGNORE_setresgid32
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#define __IGNORE_getresgid32
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#define __IGNORE_chown32
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#define __IGNORE_setuid32
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#define __IGNORE_setgid32
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#define __IGNORE_setfsuid32
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#define __IGNORE_setfsgid32
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/* these can be expressed using other calls */
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#define __IGNORE_alarm /* setitimer */
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#define __IGNORE_creat /* open */
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#define __IGNORE_fork /* clone */
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#define __IGNORE_futimesat /* utimensat */
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#define __IGNORE_getpgrp /* getpgid */
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#define __IGNORE_getdents /* getdents64 */
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#define __IGNORE_pause /* sigsuspend */
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#define __IGNORE_poll /* ppoll */
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#define __IGNORE_select /* pselect6 */
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#define __IGNORE_epoll_wait /* epoll_pwait */
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#define __IGNORE_time /* gettimeofday */
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#define __IGNORE_uname /* newuname */
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#define __IGNORE_ustat /* statfs */
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#define __IGNORE_utime /* utimes */
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#define __IGNORE_vfork /* clone */
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/* sync_file_range had a stupid ABI. Allow sync_file_range2 instead */
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#ifdef __NR_sync_file_range2
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#define __IGNORE_sync_file_range
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#endif
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/* Unmerged syscalls for AFS, STREAMS, etc. */
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#define __IGNORE_afs_syscall
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#define __IGNORE_getpmsg
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#define __IGNORE_putpmsg
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#define __IGNORE_vserver
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EOF
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}
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syscall_list() {
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grep '^[0-9]' "$1" | sort -n |
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while read nr abi name entry ; do
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echo "#if !defined(__NR_${name}) && !defined(__IGNORE_${name})"
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echo "#warning syscall ${name} not implemented"
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echo "#endif"
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done
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}
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(ignore_list && syscall_list $(dirname $0)/../arch/x86/entry/syscalls/syscall_32.tbl) | \
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$* -E -x c - > /dev/null
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