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    Subject[PATCH 2/3] execve: improve interactivity with large arguments
    This adds a preemption point during the copying of the argument and
    environment strings for execve, in copy_strings(). There is already
    a preemption point in the count() loop, so this doesn't add any new
    points in the abstract sense.

    When the total argument+environment strings are very large, the time
    spent copying them can be much more than a normal user time slice.
    So this change improves the interactivity of the rest of the system
    when one process is doing an execve with very large arguments.

    Signed-off-by: Roland McGrath <>
    fs/exec.c | 2 ++
    1 files changed, 2 insertions(+), 0 deletions(-)

    diff --git a/fs/exec.c b/fs/exec.c
    index 1b63237..6f2d777 100644
    --- a/fs/exec.c
    +++ b/fs/exec.c
    @@ -419,6 +419,8 @@ static int copy_strings(int argc, const char __user *const __user *argv,
    while (len > 0) {
    int offset, bytes_to_copy;

    + cond_resched();
    offset = pos % PAGE_SIZE;
    if (offset == 0)
    offset = PAGE_SIZE;

     \ /
      Last update: 2010-09-08 04:39    [W:0.019 / U:11.476 seconds]
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