This reduces peak memory utilization during BTF vmlinux encoding,
replacing ELF section-sized malloc()s with mmap()s.
For -j1 peak memory resident set size drops from
Maximum resident set size (kbytes): 1069220
...to:
Maximum resident set size (kbytes): 701888
...with this patch.
For -j8, peak memory resident set size drops from
Maximum resident set size (kbytes): 1121172
...to:
Maximum resident set size (kbytes): 963516
Signed-off-by: Alan Maguire <alan.maguire@xxxxxxxxxx>
---
btf_encoder.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/btf_encoder.c b/btf_encoder.c
index 5954238..9599faf 100644
--- a/btf_encoder.c
+++ b/btf_encoder.c
@@ -1879,7 +1879,7 @@ static int btf_encoder__tag_kfuncs(struct btf_encoder *encoder)
goto out;
}
- elf = elf_begin(fd, ELF_C_READ, NULL);
+ elf = elf_begin(fd, ELF_C_READ_MMAP, NULL);
if (elf == NULL) {
elf_error("Cannot update ELF file");
goto out;
--
2.43.5
