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Rustで作るLinuxトレーサ / libbpf-core-with-rust
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KONDO Uchio
April 27, 2021
Technology
1
970
Rustで作るLinuxトレーサ / libbpf-core-with-rust
@RustのLT会 Shinjuku.rs #15
https://forcia.connpass.com/event/206698/
KONDO Uchio
April 27, 2021
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Transcript
F#1'ͱ͔͍͏ࠓྲྀߦͬͯΔͭ 6DIJP,POEP(.01FQBCP *OD 4IJOKVLVST 3VTUͰ࡞Δ-JOVYτϨʔα 1IPUPCZ)FSCFSU#JFTFSIUUQTQJYBCBZDPNJNBHFTJE
γχΞɾϓϦϯγύϧΤϯδχΞ ۙ౻ Ӊஐ࿕ / @udzura https://blog.udzura.jp/ Uchio Kondo ٕज़෦ ٕज़ج൫νʔϜ
@ GMOϖύϘ / Ԭ ΤϯδχΞΧϑΣʢԬࢢẂנจԽձؗʣ αϙʔλʔ Duolingo Diamond Leaguer 💎 #Rust #Ruby #mruby #Containers #eBPF #CRIU #Seccomp #RubyKaigi #CloudNativeDays #Zumba #γϨϯ #FitBoxing2
ࠓճ͢ͷҎ֎ʹ࡞ͬͨͷ •octx wίϚϯυҰൃͰࡶʹ(JU)VCͷBDUJWJUZΛ$47ʹͯ͘͠ΕΔͭ ͦͷ··#JH2VFSZͰϩʔυՄೳɻ wPDUPDSBC SFRXFTU UPLJP
5P$ w࡞Ζ͏ͱ͍ͯ͠Δπʔϧͷ wF#1'ͱ wࠓࠓͰ͖͍ͯΔͷ wMJCCQGSTͷ͍ํ w3VTUͰΑ͔ͬͨ
F#1'
F#1' wFYUFOEFE#FSLMFZ1BLFU'JMUFS w͔Β-JOVYͰಋೖʢݩͷ࣮-JOVYͰ͔Βʣ wMJCQDBQͰΘΕ͍͕ͯͨɺTFDDPNQͦͷଞΧʔωϧػೳͰར༻ w-JOVYΧʔωϧ෦Ͱಈ͘ϓϩάϥϜΛɺϢʔβϥϯυͰهड़ wػೳʹ੍ݶ͕͋ΓɺϑΟϧλϦϯάूܭ͕ओͳׂ wৄࡉʮ͓͍ͯͭ͘͠Α͘ͳΔF#1'ʯͰݕࡧ
F#1'ʹΑΔτϨʔα wF#1'ͷେ͖ͳ༻్ͷҰͭʹɺΧʔωϧ෦Ͱͷؔݺͼग़͠ ੩తͳΠϕϯτͳͲΛτϨʔε͠ɺूܭ͢Δ͜ͱ͕͋Δɻ w #4%4PMBSJTͰ͍͏%5SBDF wCQGUSBDFίϚϯυ #$$ #1'$PNQJMFS$PMMFDUJPO ͷ։ൃ IUUQXXXCSFOEBOHSFHHDPNCMPHCQGQFSGPSNBODFUPPMTCPPLIUNM
#1'$03& wͦΕ·Ͱͷ#1'πʔϧɺͦͷͰ#1'ϓϩάϥϜΛੜɺίϯύΠ ϧ͢ΔͳͲʢॊೈͰ͋Δ͕ʣΦʔόʔϔου͕͋ͬͨɻ wͦͷ݁Ռɺಈ࡞ʹDMBOHόΠφϦ͕ඞཁͩͬͨΓɺಋೖ͕ϋʔυ w͏গ͠खܰʹಈ͔ͤΔΑ͏ɺΧʔωϧͷܕใΛऔಘ͢Δ#5'ɺ $03& $PNQJMF0ODF 3VO&WFSZXIFSF ͳͲͷٕज़͕ग़ͯ͘Δ w$03&ʹͳΔͱϫϯόΠφϦπʔϧ
Χʔωϧͷઃఆ͍͔ͭ͘ ΛΠ ϯετʔϧ͢ΕτϨʔε͕Ͱ͖ΔΑ͏ʹɻ
࣮ͷྫ w#1'ͷϓϩάϥϜΛϏϧυ͢Δ $Ͱॻ͘ඞཁ͕͋ΔɻϓϩάϥϜͷҰ෦ ίϯύΠϧ࣌ͷΦϓγϣϯ
࣮ͷྫ w#1'ϓϩάϥϜͷΦϒδΣΫτ͔ΒTLFMʢϔομʣΛੜ͠ɺ Ϣʔβϥϯυͷ$ϓϩάϥϜ͔Β͑ΔΑ͏ʹ͢Δ CQGUPPMͱ͍͏ίϚϯυͰੜ ϓϩάϥϜͷόΠφϦࣗମ͕ϔομʹຒΊࠐ·ΕΔ
࣮ͷྫ wͦͷϔομΛͬͯόΠφϦπʔϧΛ࡞Δɻ w$ݴޠͰɻ wͪͳΈʹCDDͰͷSFGFSFODF࣮ w IUUQTHJUIVCDPNJPWJTPSCDDUSFFNBTUFSMJCCQGUPPMT
ग़དྷ্͕ͬͨόΠφϦͷΠϝʔδ Ϣʔβϥϯυ Χʔωϧ෦ ϓϩάϥϜʢϫϯόΠφϦʣ #1'ϓϩάϥϜ ϩʔυ σʔλΓऔΓ ϓϩάϥϜ ࣮ߦɾूܭ Φϓγϣϯͷղੳ
ग़ྗ Ճ #1' ࣮ߦ࣌ݕࠪ #1'.BQ 1FSGCV⒎FS ར༻ऀ
͜͜·Ͱͷͬ͘͟Γͨ͠·ͱΊ wF#1'͍ͬͯ͏-JOVYͷτϨʔαͳͲΛ࡞Δศརٕज़͕͋Δ wF#1'πʔϧɺҎલDMBOHͰͦͷͰίϯύΠϧ͍͕ͯͨ͠ɺ ࠷ۙϫϯόΠφϦͰΕΔΑ͏ʹͳͬͨ ཁ৽͍͠Χʔωϧ wͦ͏͢ΔͱίϚϯυϥΠϯπʔϧ෦ؚΊͯϫϯόΠφϦʹ͍ͨ͠ wͦͷSFGFSFODF࣮$ݴޠɻ$ݴޠɻ ʮ1SPEVDUJPOͰ#$$ΑΓMJCCQG #1'$03&Λ͏ํ͕ྑ͍ʯ
IUUQTJUJTLKIBUFOBCMPHDPNFOUSZͳͲࢀর
Ϣʔβϥϯυ$ݴޠͰ͋Δඞཁ wͬͯɺຊʹ͋Δʁ w$ݴޠͷ͠͞ wΦϓγϣϯύʔεҰͭͰจࣈྻͷѻ͍ʹۤ࿑͢Δ wͪΐͬͱͨ͜͠ͱͰෆ҆શͳίʔυ͕ wϝϞϦͷѻ͍͕ϝϞϦ͕ w#1'ϓϩάϥϜํͳ͍ʢWFSJpFS͋Δʣ͚ͲɺϢʔβϥϯυ $ͬͯେม͡Όͳ͍ʁ
ͦ͜Ͱ3VTU
ͭͬͨ͘ͷ
DPOUBJOFSUSBDFST wίϯςφؔͷτϨʔεʹಛԽͨ͠πʔϧ܈Λ࡞Ζ͏ͱ͍ͯ͠Δ w൚༻తͳͷ͢Ͱʹ͋ΔͷͰ w3VTU MJCCQGST w$03&ͳͷͰΧʔωϧ͕ ͔ͳΓ৽͘͠ͳ͍ͱͰ͕͢ IUUQTHJUIVCDPNVE[VSBDPOUBJOFSUSBDFSTɹ
DPOTUBU wίϯςφ୯ҐͰͷ γεςϜίʔϧݺͼग़͠ͷ ౷ܭΛදࣔ͢Δ
VOTIBSFTOPPQ wVOTIBSF ͱ͍͏ɺίϯςφΛ࡞͢Δ্ͰॏཁͳγεςϜίʔϧ ͷݺͼग़͠ͱɺͦͷϑϥάΛτϨʔε͢Δ
DPOCJPHSBQI wίϯςφ୯ҐͰɺCMPDL*0ͷঢ়گΛՄࢹԽ͢Δɻ wάϥϑදࣔͰͬͪΌ͚͗ͨ͢ͷͰɺ͏গ͠ݟ͍͢දࣔΛࠓޙ࣮ ͍ͨ͠ʜ
%FNP wDPOTUBU ࠓࢥ͏ͱQFSGͰͰ͖Δؾ ҰԠύϑΥʔϚϯεʹ༏ΕΔ ͣ ˞ಈըͲ͔͜ʹΞοϓ͠·͢
MJCCQGST
MJCCQGSTͱ wF#1'ͷػೳΛ͏গ͠ΞΫηε͘͢͠ϥοϓͨ͠ϥΠϒϥϦͱ͠ ͯMJCCQGͱ͍͏ͷ͕͋Δɻ w#1'ϓϩάϥϜͷϩʔυ w#1'.BQQFSGCV⒎FSͳͲσʔλͷΓऔΓͷΠϯλϑΣʔε wMJCCQG$ϥΠϒϥϦͳͷͰɺ3VTU͔Β͍ͨ͘͢͠ͷ͕ MJCCQGSTɻ
جຊతͳ͍ํ wCQGϓϩάϥϜΛॻ͘ w cargo libbpf buildͰίϯύΠϧͰ͖Δ w cargo libbpf genͰ3VTUͷTLFMΛੜ
w͋ͱͦͷTLFMΛͬͯ3VTUϓϩάϥϜΛॻ͘ wMJCCQGSTͷػೳʹՃ͑ͯɺTUSVDUPQU DUSMD BOZIPX ͦͷଞී௨ͷ 3VTUͷίϚϯυϥΠϯπʔϧͱͯ͠ϓϩάϥϜΛॻ͚0,
NBJOͷྫ ϏϧμʔΛܦ༝ͯ͠ TLFMΛ։͘ ύϥϝʔλΛೖΕͯ TLFMΛϩʔυɺΞλον F#1'ͷΠϯλϑΣʔε͔Β σʔλΛऔಘɺදࣔ
σʔλදࣔͷྫʢQFSGCV⒎FSʣ wσʔλදࣔ༻ͷίʔϧόοΫؔΛఆٛɻσʔλࣗମ&[u8]Ͱ ͬͯ͘ΔͷͰɺQMBJODSBUFͰมͷඞཁ͕͋Δɻ SFQS D ͳߏମʹ1MBJOΛ࣮
σʔλදࣔͷྫʢ#1'.BQʣ w#1'.BQͱ͍͏σʔλूੵମΛܦ༝ͯ͠ɺΧʔωϧͰूΊͨσʔλ ʹϢʔβϥϯυ͔ΒΞΫηεɺදࣔͰ͖Δɻ ߏମఆٛΛ$3VTUͰ߹ΘͤΔ LFZWBMVFͱʹ&[u8]ͳͷͰɺ͜͜Ͱม
Ϣʔβϥϯυ͔Β#1'.BQΛߋ৽ wඵຖʹΧϯλϦηοτ͢ΔΑ͏ͳϓϩάϥϜΛॻ͚Δɻ ॻ͚Δ͚ͲɺMap::update()͕LFZWBMVFͱʹ&[u8]Λཁٻ͢Δͷ Ͱɺ͜͜ม͔͠VOTBGF plain::as_bytes()ͰͰ͖Δ͚Ͳ
<3VTUϨΠϠϝϦοτ>
θϩίετநԽͷڧ͞ w؆ܿʹએݴతʹॻ͍ͯɺεϐʔυͷ͜ͱΛؾʹ͠ͳ͍͍ͯ͘ɺͱ͍ ͏ͷ͍͍ମݧɻ wΤϥʔΛResult<T, E>Ͱѻ͑Δ͚ͩͰੜ࢈ੑΊͬͪΌߴ͍ wͪΖΜϝϞϦʢجຊతʹʣ҆શ wίϚϯυϥΠϯπʔϧͰTUSVDUPQU͕͍͍ wͱʹ͔͘TUSVDUPQU͕͍͍ʢճʣ
๛ͳDSBUFΛ͑Δ wίΞͰͳ͍෦ͷ࠶ൃ໌ਏ͍ͷͰɺ͍͍ײ͡ͷ࣮ʹ͔ͬΓ͍ͨ wΦϓγϣϯύʔαɺ''*ɺՄࢹԽ wUFYUQMPUT͍͍ wDBSHP͕ͦͦ ͍͍ɺXZDBUT
''*ʹڧ͍ wࠓճͷMJCCQGͷΑ͏ʹɺ$ݴޠϕʔεʢ͔͠-JOVYΧʔωϧͱҰॹʹ ϝϯς͞Ε͍ͯΔʣͷͰ͔͍ϥΠϒϥϦΛૉʹ͑Δͷ͍͍ w3VTU$ͰߏମɺϙΠϯλΛΓͱΓ͍͢͠ͷॿ͔Δ w࣌ʹVOTBGFʹͳΔ͚Ͳ
ࠔͬͯΔ͜ͱͱ͔ࠓޙ
ࠓޙͷ՝ wͱ͍͑VOTBGF͕ଟ͍ؾ͕͢ΔɺͳΜͱ͔ͳΒͳ͍͔ͳ w1MBJODSBUFʹཔ͍ͬͯΔͱ͜ΖΛͬͱ͏·͘Ӆ͢ͱ͍͍ͷ͔ wͱ͍͏͔ɺMJCCQG@ST͕&[u8]Λཁٻ͗͢͠ w''*पΓͷػೳ·ͩௐ࢝Ί͔ͨΓͰɺ$ݴޠΈ͍ͨͳॻ͖ํʹ ͳͬͯ͠·͏ɻཁݚڀɻ
ͦͷଞΓ͍ͨ͜ͱ wπʔϧͱͯ͠͏গ͠খճΓΛྑ͍ͨ͘͠ɻ wΦϓγϣϯ૿ͨ͠Γɺͬͱ৭ʑͳϝτϦοΫΛऔΓ͍ͨ wӳޠͱ͔ͰهࣄΛॻ͍ͨํ͕ड͚ͦ͏ɻॻ͘ɻ w͋ͱɺࣗͰ͋·Γ͑ͯͳ͍ͷͰͬͯΈΔɻ