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Re: zap_page_range(): TLB flush race

To: kanoj@google.engr.sgi.com
Subject: Re: zap_page_range(): TLB flush race
From: "David S. Miller" <davem@redhat.com>
Date: Sat, 8 Apr 2000 16:44:14 -0700
CC: manfreds@colorfullife.com, linux-kernel@vger.rutgers.edu, linux-mm@kvack.org
In-reply-to: <200004082111.OAA73647@google.engr.sgi.com>(kanoj@google.engr.sgi.com)
References: <200004082111.OAA73647@google.engr.sgi.com>
Sender: owner-linux-mm@kvack.org

   > filemap_sync() calls flush_tlb_page() for each page, but IMHO this is a
   > really bad idea, the performance will suck with multi-threaded apps on
   > SMP.

   The best you can do probably is a flush_tlb_range?

People, look at the callers of filemap_sync, it does range tlb/cache
flushes so the flushes in filemap_sync_pte() are in fact spurious.

Later,
David S. Miller
davem@redhat.com
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Follow-Ups:
- Re: zap_page_range(): TLB flush race
  - From: kanoj@google.engr.sgi.com (Kanoj Sarcar)

References:
- Re: zap_page_range(): TLB flush race
  - From: kanoj@google.engr.sgi.com (Kanoj Sarcar)
- Re: zap_page_range(): TLB flush race
  - From: kanoj@google.engr.sgi.com (Kanoj Sarcar)

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