https://bugzilla.kernel.org/show_bug.cgi?id=60991 Bug ID: 60991 Summary: Formula of CommitLimit is wrong Product: Documentation Version: unspecified Hardware: All OS: Linux Status: NEW Severity: normal Priority: P1 Component: man-pages Assignee: documentation_man-pages@xxxxxxxxxxxxxxxxxxxx Reporter: sworddragon2@xxxxxxx Regression: No The documentation on https://www.kernel.org/doc/Documentation/filesystems/proc.txt says: "The CommitLimit is calculated with the following formula: CommitLimit = ('vm.overcommit_ratio' * Physical RAM) + Swap" Variables on my system: vm.overcommit_ratio = 50 Physical RAM = 16 GiB SwapTotal = 16776188 KiB /proc/meminfo says "CommitLimit: 24993316 kB". Now lets see if this is correct: CommitLimit = (50 * 16777216 KiB) + 16776188 KiB; CommitLimit = 855636988 KiB. The result from the formula does not match with the value reported by the kernel. It is more likely that 'vm.overcommit_ratio' must be devided by 100 and "Physical RAM" must be replaced by the available memory (reported on my system as "MemTotal: 16434260 kB"). The new formula looks this: CommitLimit = ('vm.overcommit_ratio' / 100 * 'MemTotal') + 'SwapTotal'. The result will be: CommitLimit = (50 / 100 * 16434260 KiB) + 16776188 KiB; CommitLimit = 24993318 KiB. There is a difference of 2 KiB to the reported value but maybe this comes from internal rounding. -- You are receiving this mail because: You are watching the assignee of the bug. -- To unsubscribe from this list: send the line "unsubscribe linux-man" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
