proc: speed up /proc/*/statm
top(1) reads all /proc/*/statm files but kernel threads will always have zeros. Print those zeroes directly without going through seq_put_decimal_ull(). Speed up reading /proc/2/statm (which is kthreadd) is like 3%. My system has more kernel threads than normal processes after booting KDE. Signed-off-by:Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by:
Andrew Morton <akpm@linux-foundation.org> Link: http://lkml.kernel.org/r/20200307154435.GA2788@avx2 Signed-off-by:
Linus Torvalds <torvalds@linux-foundation.org>
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