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author | Kirill Smelkov | 2012-11-02 12:41:01 +0100 |
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committer | Linus Torvalds | 2013-01-16 21:42:57 +0100 |
commit | 3a55fb0d9fe8e2f4594329edd58c5fd6f35a99dd (patch) | |
tree | 7198833c5bc3e7aac4b2a23282c2c4a09eae85d2 /fs/xfs/xfs_qm_syscalls.c | |
parent | mfd, TWL4030: TWL4030 need select REGMAP_I2C (diff) | |
download | kernel-qcow2-linux-3a55fb0d9fe8e2f4594329edd58c5fd6f35a99dd.tar.gz kernel-qcow2-linux-3a55fb0d9fe8e2f4594329edd58c5fd6f35a99dd.tar.xz kernel-qcow2-linux-3a55fb0d9fe8e2f4594329edd58c5fd6f35a99dd.zip |
Tell the world we gave up on pushing CC_OPTIMIZE_FOR_SIZE
In commit 281dc5c5ec0f ("Give up on pushing CC_OPTIMIZE_FOR_SIZE") we
already changed the actual default value, but the help-text still
suggested 'y'. Fix the help text too, for all the same reasons.
Sadly, -Os keeps on generating some very suboptimal code for certain
cases, to the point where any I$ miss upside is swamped by the downside.
The main ones are:
- using "rep movsb" for memcpy, even on CPU's where that is
horrendously bad for performance.
- not honoring branch prediction information, so any I$ footprint you
win from smaller code, you lose from less code density in the I$.
- using divide instructions when that is very expensive.
Signed-off-by: Kirill Smelkov <kirr@mns.spb.ru>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/xfs/xfs_qm_syscalls.c')
0 files changed, 0 insertions, 0 deletions