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Date:      Tue, 25 Sep 2001 23:54:32 -0700 (PDT)
From:      Matt Dillon <dillon@FreeBSD.org>
To:        cvs-committers@FreeBSD.org, cvs-all@FreeBSD.org
Subject:   cvs commit: src/sys/kern imgact_aout.c imgact_elf.c kern_subr.c vfs_vnops.c src/sys/sys uio.h
Message-ID:  <200109260654.f8Q6sWF32652@freefall.freebsd.org>

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dillon      2001/09/25 23:54:32 PDT

  Modified files:
    sys/kern             imgact_aout.c imgact_elf.c kern_subr.c 
                         vfs_vnops.c 
    sys/sys              uio.h 
  Log:
  Make uio_yield() a global.  Call uio_yield() between chunks
  in vn_rdwr_inchunks(), allowing other processes to gain an exclusive
  lock on the vnode.  Specifically: directory scanning, to avoid a race to the
  root directory, and multiple child processes coring simultaniously so they
  can figure out that some other core'ing child has an exclusive adv lock and
  just exit instead.
  
  This completely fixes performance problems when large programs core.  You
  can have hundreds of copies (forked children) of the same binary core all
  at once and not notice.
  
  MFC after:	3 days
  
  Revision  Changes    Path
  1.73      +3 -3      src/sys/kern/imgact_aout.c
  1.106     +3 -3      src/sys/kern/imgact_elf.c
  1.48      +2 -4      src/sys/kern/kern_subr.c
  1.121     +5 -2      src/sys/kern/vfs_vnops.c
  1.15      +2 -1      src/sys/sys/uio.h


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