diff options
| author | Cliff Wickman <[email protected]> | 2010-09-08 10:14:27 -0500 |
|---|---|---|
| committer | Ingo Molnar <[email protected]> | 2010-09-09 09:46:23 +0200 |
| commit | 37a2f9f30a360fb03522d15c85c78265ccd80287 (patch) | |
| tree | bcc77b64a38aff205daacea238cf0586e8301c68 /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | 1c5f50ee347daea013671f718b70cd6bf497bef9 (diff) | |
x86, kdump: Change copy_oldmem_page() to use cached addressing
The copy of /proc/vmcore to a user buffer proceeds much faster
if the kernel addresses memory as cached.
With this patch we have seen an increase in transfer rate from
less than 15MB/s to 80-460MB/s, depending on size of the
transfer. This makes a big difference in time needed to save a
system dump.
Signed-off-by: Cliff Wickman <[email protected]>
Acked-by: "Eric W. Biederman" <[email protected]>
Cc: [email protected]
Cc: <[email protected]> # as far back as it would apply
LKML-Reference: <[email protected]>
Signed-off-by: Ingo Molnar <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions