From: Oleg Nesterov <oleg@redhat.com>
To: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: Vlastimil Babka <vbabka@suse.cz>,
Yang Shi <yang.shi@linux.alibaba.com>,
mhocko@kernel.org, willy@infradead.org,
ldufour@linux.vnet.ibm.com, kirill@shutemov.name,
akpm@linux-foundation.org, peterz@infradead.org,
mingo@redhat.com, acme@kernel.org,
alexander.shishkin@linux.intel.com, jolsa@redhat.com,
namhyung@kernel.org, linux-mm@kvack.org, liu.song.a23@gmail.com,
ravi.bangoria@linux.ibm.com, linux-kernel@vger.kernel.org
Subject: Re: [RFC v8 PATCH 2/5] uprobes: introduce has_uprobes helper
Date: Thu, 23 Aug 2018 17:15:55 +0200 [thread overview]
Message-ID: <20180823151554.GC10652@redhat.com> (raw)
In-Reply-To: <20180822150718.GB52756@linux.vnet.ibm.com>
On 08/22, Srikar Dronamraju wrote:
>
> * Vlastimil Babka <vbabka@suse.cz> [2018-08-22 12:55:59]:
>
> > On 08/15/2018 08:49 PM, Yang Shi wrote:
> > > We need check if mm or vma has uprobes in the following patch to check
> > > if a vma could be unmapped with holding read mmap_sem.
Confused... why can't we call uprobe_munmap() under read_lock(mmap_sem) ?
OK, it can race with find_active_uprobe() but I do not see anything really
wrong, and a false-positive MMF_RECALC_UPROBES is fine.
Again, I think we should simply kill uprobe_munmap(), but this needs another
discussion.
Oleg.
next prev parent reply other threads:[~2018-08-23 15:16 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-15 18:49 [RFC v8 PATCH 0/5] mm: zap pages with read mmap_sem in munmap for large mapping Yang Shi
2018-08-15 18:49 ` [RFC v8 PATCH 1/5] mm: refactor do_munmap() to extract the common part Yang Shi
2018-08-15 18:49 ` [RFC v8 PATCH 2/5] uprobes: introduce has_uprobes helper Yang Shi
2018-08-22 10:55 ` Vlastimil Babka
2018-08-22 15:07 ` Srikar Dronamraju
2018-08-22 20:51 ` Yang Shi
2018-08-23 15:15 ` Oleg Nesterov [this message]
2018-08-23 16:07 ` Yang Shi
2018-08-15 18:49 ` [RFC v8 PATCH 3/5] mm: mmap: zap pages with read mmap_sem in munmap Yang Shi
2018-08-15 19:16 ` Matthew Wilcox
2018-08-15 21:09 ` Matthew Wilcox
2018-08-15 21:54 ` Yang Shi
2018-08-16 2:46 ` Matthew Wilcox
2018-08-16 6:11 ` Yang Shi
2018-08-22 11:11 ` Vlastimil Babka
2018-08-22 19:20 ` Yang Shi
2018-08-22 11:19 ` Vlastimil Babka
2018-08-22 20:45 ` Yang Shi
2018-08-22 21:10 ` Kirill A. Shutemov
2018-08-22 21:42 ` Dave Hansen
2018-08-22 21:56 ` Yang Shi
2018-08-22 22:03 ` Dave Hansen
2018-08-15 18:49 ` [RFC v8 PATCH 4/5] mm: unmap VM_HUGETLB mappings with optimized path Yang Shi
2018-08-15 18:49 ` [RFC v8 PATCH 5/5] mm: unmap VM_PFNMAP " Yang Shi
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