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pfiles in zone
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| #include <fcntl.h> | |
| #include <stdio.h> | |
| #define FILE_TO_OPEN "/etc/passwd" | |
| #define TIMES 5000 | |
| int main() { | |
| int fd; | |
| int i; | |
| printf("pid: %d\n", getpid()); | |
| for (i = 0; i < TIMES; i++) { | |
| if (fd = open(FILE_TO_OPEN, O_RDONLY) == -1) { | |
| perror("open"); | |
| return 1; | |
| } | |
| } | |
| sleep(300); | |
| return 0; | |
| } |
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| dave - sjc1-dave-01 sunos ~ $ ./open-5k & | |
| [1] 32690 | |
| pid: 32690 | |
| dave - sjc1-dave-01 sunos ~ $ sudo dtrace -n 'syscall:::entry /pid == $target/ { @[probefunc]=count(); }' -c "sudo pfiles 32690" | |
| dtrace: description 'syscall:::entry ' matched 233 probes | |
| ... | |
| (pfiles output) | |
| forksys 1 | |
| getcwd 1 | |
| pipe 1 | |
| putmsg 1 | |
| recv 1 | |
| schedctl 1 | |
| setrlimit 1 | |
| sigpending 1 | |
| so_socketpair 1 | |
| sysi86 1 | |
| waitsys 1 | |
| write 1 | |
| getrlimit 2 | |
| gtime 2 | |
| munmap 2 | |
| privsys 2 | |
| setpgrp 2 | |
| systeminfo 2 | |
| lwp_sigmask 3 | |
| pollsys 3 | |
| setcontext 3 | |
| so_socket 3 | |
| getgroups 4 | |
| setgroups 4 | |
| setuid 4 | |
| sysconfig 4 | |
| setregid 8 | |
| setreuid 8 | |
| getpid 9 | |
| fcntl 10 | |
| lseek 10 | |
| priocntlsys 11 | |
| ioctl 12 | |
| brk 15 | |
| doorfs 18 | |
| getuid 20 | |
| fstat 23 | |
| sigaction 33 | |
| memcntl 36 | |
| mmapobj 39 | |
| resolvepath 39 | |
| lwp_cond_broadcast 40 | |
| read 43 | |
| mmap 51 | |
| close 62 | |
| open 65 | |
| stat 87 |
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| #!/usr/bin/env node | |
| var net = require('net'); | |
| for (var i = 0; i < 5000; i++) | |
| net.connect(80, 'daveeddy.com'); |
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| dave - sjc1-dave-01 sunos ~ $ ./open-5k-sockets.js & | |
| [1] 34728 | |
| dave - sjc1-dave-01 sunos ~ $ sudo ptime pfiles 34728 | |
| 34728: node ./open-5k-sockets.js | |
| real 1:28.918439782 | |
| user 0.695646071 | |
| sys 1:26.230105158 |
8 14722 readlink:entry
libc.so.1`__systemcall6+0x1e
libproc.so.1`load_fdinfo+0x17c
libproc.so.1`Pfdinfo_iter+0x32
pfiles`show_files+0x4b
pfiles`main+0x1b6
pfiles`_start+0x6c
Cut 1k open files down to 4 seconds by LD_PRELOADing a readlink that does nothing
#include <stdlib.h>
#include <errno.h>
size_t readlink(const char *path, char *buf, size_t bufsize) {
errno = ENOSYS;
return -1;
}$ cc -shared -fPIC -o readlink.so readlink.c
$ node open-1k-sockets.js &
[1] 88758
$ LD_PRELOAD=./readlink.so /usr/bin/amd64/ptime /usr/bin/amd64/pfiles 88758
... 1000 open sockets ...
real 4.061913621
user 0.354056032
sys 2.692370925
diff --git a/usr/src/lib/libproc/common/Pfdinfo.c b/usr/src/lib/libproc/common/Pfdinfo.c
index 1244397..b5e4d83 100644
--- a/usr/src/lib/libproc/common/Pfdinfo.c
+++ b/usr/src/lib/libproc/common/Pfdinfo.c
@@ -134,10 +134,17 @@ load_fdinfo(struct ps_prochandle *P)
info->pr_offset = pr_llseek(P, fd, 0, SEEK_CUR);
/* attempt to determine the path to it */
- (void) snprintf(path, sizeof (path),
- "%s/%d/path/%d", procfs_path, (int)P->pid, fd);
- len = readlink(path, info->pr_path,
- sizeof (info->pr_path) - 1);
+ switch (info->pr_mode & S_IFMT) {
+ case S_IFSOCK: case S_IFDOOR: /* not applicable */
+ len = -1;
+ break;
+ default:
+ (void) snprintf(path, sizeof (path),
+ "%s/%d/path/%d", procfs_path, (int)P->pid, fd);
+ len = readlink(path, info->pr_path,
+ sizeof (info->pr_path) - 1);
+ break;
+ }
if (len < 0) {
info->pr_path[0] = 0;
without LD_PRELOAD
dave - sjc1-dave-01 sunos ~/pfiles $ ./open-sockets.js &
[1] 75375
dave - sjc1-dave-01 sunos ~/pfiles $ opened 1000 sockets
ptime pfiles 75375 > /dev/null
real 45.522214487
user 0.334410765
sys 44.691393983
with LD_PRELOAD
dave - sjc1-dave-01 sunos ~/pfiles $ ./open-sockets.js &
[1] 75690
dave - sjc1-dave-01 sunos ~/pfiles $ opened 1000 sockets
LD_PRELOAD=./readlink.so /usr/bin/amd64/ptime /usr/bin/amd64/pfiles 75690 > /dev/null
real 3.887839734
user 0.328562456
sys 2.558752763
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dtracing open-5k-sockets
pfiles(without-n)