| To: | juncheng bai <baijuncheng@xxxxxxxxxxxxxxx> |
|---|---|
| Subject: | Re: Possible memory allocation deadlock in kmem_alloc and hung task in xfs_log_commit_cil and xlog_cil_push |
| From: | Dave Chinner <david@xxxxxxxxxxxxx> |
| Date: | Thu, 9 Jul 2015 11:58:25 +1000 |
| Cc: | Gavin Guo <gavin.guo@xxxxxxxxxxxxx>, linux-kernel <linux-kernel@xxxxxxxxxxxxxxx>, xfs@xxxxxxxxxxx |
| Delivered-to: | xfs@xxxxxxxxxxx |
| In-reply-to: | <559D2E52.2070900@xxxxxxxxxxxxxxx> |
| References: | <CA+eFSM30A1V7j4CYJOyLSN7V7REHt0hrxteU1dVRw4HQZLmuxw@xxxxxxxxxxxxxx> <20150707233743.GZ7943@dastard> <CA+eFSM2mSSW-BtP5-ArHREPu9sRRO3=J8acWJ-h_iZHfLPnhiw@xxxxxxxxxxxxxx> <559D2E52.2070900@xxxxxxxxxxxxxxx> |
| User-agent: | Mutt/1.5.21 (2010-09-15) |
On Wed, Jul 08, 2015 at 10:06:10PM +0800, juncheng bai wrote: > Hi, All > > As far as I know, the patch b3f03bac8132207a20286d5602eda64500c19724 > solves one case which big directory size. > > I am not very familiar with xfs, but I think why can't we use vmalloc > when kmalloc fails? Because vmalloc space is greatly limited on 32 bit machines and hence we can't just use vmalloc blindly in these situations. Cheers, Dave. -- Dave Chinner david@xxxxxxxxxxxxx |
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