[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v4] tools/xl: fix autoballoon regex
This regex is used for auto-balloon mode detection based on Xen command line. The case of specifying a negative size was handled incorrectly. >From misc/xen-command-line documentation: dom0_mem (x86) = List of ( min:<sz> | max:<sz> | <sz> ) If a size is positive, it represents an absolute value. If a size is negative, it is subtracted from the total available memory. Also add support for [tT] granularity suffix. Also add support for memory fractions (i.e. '50%' or '1G+25%'). Signed-off-by: Dmitry Isaykin <isaikin-dmitry@xxxxxxxxx> --- Changes in v4: - improve regex after code review Changes in v3: - add support for [tT] granularity suffix - add support for memory fractions Changes in v2: - add missing Signed-off-by tag NB! New autoballon regex pattern is good enough, but not fully correct. See test below. ``` import pytest import re size_pattern = r"-?[0-9]+[bBkKmMgGtT]?" pattern = r"(^| )dom0_mem=((|min:|max:)({size}|({size}\+)?[0-9]{{1,2}}%),?)+($| )".format(size=size_pattern) @pytest.mark.parametrize('cmdline', [ 'dom0_mem=1', ' dom0_mem=1', 'dom0_mem=1G', 'dom0_mem=25%', 'dom0_mem=1g+25% ', ' dom0_mem=1G+10%,max:100T+50%', 'dom0_mem=-1B', 'dom0_mem=-10240M+5%,min:512M ', ' dom0_mem=min:-2048m,max:-2048M ', ]) def test_autoballoon_regex_match(cmdline): assert re.match(pattern, cmdline) @pytest.mark.parametrize('cmdline', [ 'dom0_mem = 1', 'dom0_mem= ', 'dom0_mem', 'DOM0_mem=10G', 'dom0_mem=-10%', # does not pass ' dom0_mem=-10%+10G ', 'dom0_mem=1G,', # does not pass 'dom0_mem=1G,max:25%,', #does not pass ]) def test_autoballoon_regex_dont_match(cmdline): assert not re.match(pattern, cmdline) ``` --- tools/xl/xl.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) diff --git a/tools/xl/xl.c b/tools/xl/xl.c index 4107d10fd4..58af7936fa 100644 --- a/tools/xl/xl.c +++ b/tools/xl/xl.c @@ -80,9 +80,14 @@ static int auto_autoballoon(void) if (!info) return 1; /* default to on */ +#define SIZE_PATTERN "-?[0-9]+[bBkKmMgGtT]?" + ret = regcomp(®ex, - "(^| )dom0_mem=((|min:|max:)[0-9]+[bBkKmMgG]?,?)+($| )", + "(^| )dom0_mem=((|min:|max:)(" SIZE_PATTERN "|(" SIZE_PATTERN "\\+)?[0-9]{1,2}%),?)+($| )", REG_NOSUB | REG_EXTENDED); + +#undef SIZE_PATTERN + if (ret) return 1; -- 2.33.0
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