On Mon, Mar 26, 2012 at 1:19 PM, Richard Elling
<richard.ell...@richardelling.com> wrote:
> Apologies to the ZFSers, this thread really belongs elsewhere.
>
> Let me explain below:
>
> Root documentation path of apache is in zfs, you see
> it at No.3 at the above dtrace report.
>
>
> The sort is in reverse order. The large number you see below the
> stack trace is the number of times that stack was seen. By far the
> most frequently seen is tmpfs`tmp_readdir
It's true, but I didn't see any potential issues there.
>
>
> tmpfs(/tmp) is the place where PHP place the temporary
> folders and files.
>
>
> bingo
>
I have to paste the lock investigation here again,
Firstly, you can see which lock is spinning:
=======================================================
# lockstat -D 10 sleep 2
Adaptive mutex spin: 1862701 events in 3.678 seconds (506499 events/sec)
Count indv cuml rcnt nsec Lock Caller
-------------------------------------------------------------------------------
829064 45% 45% 0.00 33280 0xffffff117624a5d0 rrw_enter_read+0x1b
705001 38% 82% 0.00 30983 0xffffff117624a5d0 rrw_exit+0x1d
140678 8% 90% 0.00 10546 0xffffff117624a6e0 zfs_zget+0x46
37208 2% 92% 0.00 5403 0xffffff114b136840 vn_rele+0x1e
33926 2% 94% 0.00 5417 0xffffff114b136840 lookuppnatcred+0xc5
27188 1% 95% 0.00 1155 vn_vfslocks_buckets+0xd980
vn_vfslocks_getlock+0x3b
11073 1% 96% 0.00 1639 vn_vfslocks_buckets+0x4600
vn_vfslocks_getlock+0x3b
9321 1% 96% 0.00 1961 0xffffff114b82a680 dnlc_lookup+0x83
6929 0% 97% 0.00 1590 0xffffff11573b8f28
zfs_fastaccesschk_execute+0x6a
5746 0% 97% 0.00 5935 0xffffff114b136840 lookuppnvp+0x566
-------------------------------------------------------------------------------
Then if you look at the caller of lock(0xffffff117624a5d0), you'll see
it's ZFS, not tmpfs.
============================================================
Count indv cuml rcnt nsec Lock Caller
48494 6% 17% 0.00 145263 0xffffff117624a5d0 rrw_enter_read+0x1b
nsec ------ Time Distribution ------ count Stack
256 | 17 rrw_enter+0x2c
512 | 1120 zfs_root+0x3b
1024 |@ 1718 fsop_root+0x2d
2048 |@@ 4834 traverse+0x65
4096 |@@@@@@@@@@@ 18569 lookuppnvp+0x446
8192 |@@@@ 6620 lookuppnatcred+0x119
16384 |@ 2929 lookupnameatcred+0x97
32768 |@ 1635 lookupnameat+0x6b
65536 | 894 cstatat_getvp+0x11e
131072 | 1249 cstatat64_32+0x5d
262144 |@ 1620 fstatat64_32+0x4c
524288 |@ 2474
_sys_sysenter_post_swapgs+0x149
That's why I post this subject here. Hope it's clear this time.
Thanks,
-Aubrey
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