lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
Open Source and information security mailing list archives
| ||
|
Date: Fri, 14 May 2010 09:53:51 +0200 From: Peter Zijlstra <peterz@...radead.org> To: Mathieu Desnoyers <mathieu.desnoyers@...icios.com> Cc: Steven Rostedt <rostedt@...dmis.org>, Frederic Weisbecker <fweisbec@...il.com>, Pierre Tardy <tardyp@...il.com>, Ingo Molnar <mingo@...e.hu>, Arnaldo Carvalho de Melo <acme@...hat.com>, Tom Zanussi <tzanussi@...il.com>, Paul Mackerras <paulus@...ba.org>, linux-kernel@...r.kernel.org, arjan@...radead.org, ziga.mahkovec@...il.com, davem <davem@...emloft.net> Subject: Re: Perf and ftrace [was Re: PyTimechart] On Thu, 2010-05-13 at 12:31 -0400, Mathieu Desnoyers wrote: > > In addition, this would play well with mmap() too: we can simply add a > ring_buffer_get_mmap_offset() method to the backend (exported through another > ioctl) that would let user-space know the start of the mmap'd buffer range > currently owned by the reader. So we can inform user-space of the currently > owned page range without even changing the underlying memory map. I still think keeping refs to splice pages is tricky at best. Suppose they're spliced into the pagecache of a file, it could stay there for a long time under some conditions. Also, the splice-client (say the pagecache) and the mmap will both want the pageframe to contain different information. -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Powered by blists - more mailing lists