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Don't spend too much time compressing large symbol tables.

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committer: jreiser <jreiser> 1090072585 +0000
This commit is contained in:
John Reiser 2004-07-17 13:56:25 +00:00
parent ce3d3a850c
commit a2b305ed3b
1 changed files with 16 additions and 3 deletions
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19
src/p_vmlinx.cpp
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@ -76,9 +76,11 @@ compare_Phdr(void const *const aa, void const *const bb)
Elf_LE32_Phdr const *const b = (Elf_LE32_Phdr const *)bb;
unsigned const xa = a->p_type - Elf_LE32_Phdr::PT_LOAD;
unsigned const xb = b->p_type - Elf_LE32_Phdr::PT_LOAD;
if (xa < xb) return -1;
if (xa > xb) return 1;
return le32_compare(&a->p_paddr, &b->p_paddr);
if (xa < xb) return -1; // PT_LOAD first
if (xa > xb) return 1;
if (a->p_paddr < b->p_paddr) return -1; // ascending by .p_paddr
if (a->p_paddr > b->p_paddr) return 1;
return 0;
}
//
@ -262,7 +264,18 @@ void PackVmlinuxI386::pack(OutputFile *fo)
ph.u_len = file_size - (sz_ptload + phdri[0].p_offset);
fi->seek(sz_ptload + phdri[0].p_offset, SEEK_SET);
fi->readx(ibuf, ph.u_len);
// Temporarily decrease ph.level by about (1+ log2(sz_rest / sz_ptload))
// to avoid spending unreasonable effort compressing large symbol tables
// that are discarded 99.9% of the time anyway.
int const old_level(ph.level);
for (unsigned v = ((ph.u_len>>3) + ph.u_len) / sz_ptload; 0 < v; v>>=1) {
if (0== --ph.level) {
ph.level = 1;
}
}
compress(ibuf, obuf);
ph.level = old_level;
// while (0!=*p++) ; // name is the same
shdro[3].sh_name = p - shstrtab;