Could you resend it to be sure? I flagged it for redelivery the day
I emailed you so if nobody else has seen it yet then something still
didn't work. I was pretty sure I'd seen it get delivered ok to oss,
but... (shrug)
Brent
On 04/12/2016 02:56 AM, Alex Lyakas wrote:
Hello Dave,
Looking at the patch, I see that now we call xfs_idestroy_fork() in RCU
callback. This can do the following chain:
xfs_iext_destroy => xfs_iext_irec_remove => xfs_iext_realloc_indirect=>
kmem_realloc => kmem_alloc => kmem_alloc => congestion_wait()
At least according to documentation, the RCU callback cannot block,
since it may be called from softirq context. Is this fine?
Thanks,
Alex.
P.S.: I have submitted a patch called “[PATCH] xfs: optimize destruction
of the indirection array”, which changes xfs_iext_destroy to call only
kmem_free(). But this patch got stuck in the spam filter of the mailing
list, and Brent is working to release it from there.
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