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2016 Jun 05
6
LLD: Using sendfile(2) to copy file contents
This is a short summary of an experiment that I did for the linker.
One of the major tasks of the linker is to copy file contents from input
object files to an output file. I was wondering what's the fastest way to
copy data from one file to another, so I conducted an experiment.
Currently, LLD copies file contents using memcpy (input files and an output
file are mapped to memory.)
2015 Dec 20
8
[Bug 93458] New: page allocation failure: order:5, mode:0x240c0c0
...fo:
active_anon:317858 inactive_anon:24125 isolated_anon:0
active_file:651188 inactive_file:665467 isolated_file:0
unevictable:8 dirty:87 writeback:0 unstable:0
slab_reclaimable:334053 slab_unreclaimable:14431
mapped:105321 shmem:34094 pagetables:8218 bounce:0
free:14592 free_pcp:30 free_cma:0
DMA free:15888kB min:20kB low:24kB high:28kB active_anon:0kB inactive_anon:0kB
active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB
isolated(file):0kB present:15980kB managed:15896kB mlocked:0kB dirty:0kB
writeback:0kB mapped:0kB shmem:0kB slab_reclaimable:0kB slab_unreclaimable:8kB
ker...